All Calculators
442 free interactive calculators. No sign-up required.
Mortgage & Home
View allMortgage Payment Calculator
Calculate your monthly mortgage payment including principal, interest, taxes, and insurance.
Mortgage Refinance Calculator
Compare your current mortgage with a new loan to see monthly savings and break-even point.
Rent vs Buy Calculator
Compare the total cost of renting versus buying a home over time.
Home Affordability Calculator
Find out how much house you can afford based on your income, debts, and down payment.
Closing Costs Calculator
Estimate closing costs when buying a home including lender fees, title, and prepaids.
Home Equity Calculator
Calculate your home equity and how much you could borrow with a HELOC.
Down Payment Calculator
Find out how much to save for a home down payment and how long it will take.
Biweekly Mortgage Calculator
See how biweekly payments save you time and interest on your mortgage.
Reverse Mortgage Calculator
Estimate how much you could receive from a reverse mortgage based on your home value and age.
Balloon Mortgage Calculator
Calculate monthly payments and the balloon payment due at the end of your loan term.
ARM Calculator
Calculate payments for an adjustable rate mortgage with rate changes over time.
Mortgage Points Calculator
Calculate the break-even point for buying mortgage discount points.
Home Value Estimator
Project your home's future value based on purchase price and annual appreciation.
PMI Calculator
Calculate private mortgage insurance costs and see when PMI drops off your loan.
FHA Loan Calculator
Calculate FHA loan payments including upfront and annual mortgage insurance premiums.
VA Loan Calculator
Calculate VA loan payments with 0% down and funding fee for eligible veterans.
Jumbo Loan Calculator
Calculate jumbo mortgage payments for loans exceeding conforming loan limits.
Mortgage Tax Savings Calculator
Calculate your tax savings from the mortgage interest deduction.
Interest-Only Mortgage Calculator
Calculate payments for an interest-only mortgage and compare to a standard mortgage.
Mortgage Required Income Calculator
Calculate the income needed to qualify for a specific mortgage amount.
Seller Closing Cost Calculator
Estimate how much you will pay in closing costs when selling your home.
Mortgage Debt Consolidation Calculator
See if rolling debts into a mortgage refinance saves money.
Retirement
View all401(k) Calculator
Estimate your 401(k) balance at retirement with employer matching and investment growth.
Retirement Savings Calculator
Project your retirement savings growth and see if you are on track.
IRA Calculator
Compare Traditional vs Roth IRA growth and tax implications over time.
RMD Calculator
Calculate your Required Minimum Distribution from retirement accounts.
Social Security Calculator
Estimate your Social Security benefits based on when you start claiming.
Roth vs Traditional Calculator
Compare Roth and Traditional IRA/401(k) to see which is better for you.
Annuity Calculator
Calculate annuity payments from a lump sum or how much to invest for desired payments.
403(b) Calculator
Estimate your 403(b) retirement savings for nonprofit and education employees.
Roth vs Traditional 401(k) Calculator
Compare Roth 401(k) and Traditional 401(k) to see which gives you more in retirement.
FIRE Calculator
Calculate when you can achieve Financial Independence and Retire Early (FIRE).
Pension Calculator
Estimate your pension benefit based on years of service, salary, and benefit formula.
72(t) SEPP Calculator
Calculate substantially equal periodic payments for early retirement distributions without penalty.
457 Plan Calculator
Estimate your 457(b) deferred compensation plan growth and retirement income.
Retirement Income Calculator
Estimate how much monthly income your retirement savings can provide.
Retirement Shortfall Calculator
Find out if you are saving enough for retirement and calculate your savings gap.
Social Security Benefit Calculator
Compare Social Security benefits by claiming age from 62 to 70.
Lump Sum vs Annuity Calculator
Compare taking a lump sum payout versus an annuity over time.
Loans & Debt
View allAuto Loan Calculator
Calculate your monthly car payment and total loan cost including trade-in and sales tax.
Student Loan Payoff Calculator
Plan your student loan payoff with standard and accelerated schedules.
Debt Snowball / Avalanche Calculator
Compare debt payoff strategies — snowball (lowest balance first), avalanche (highest interest first), and more.
Personal Loan Calculator
Calculate monthly payments, total interest, and effective APR for a personal loan.
Debt Consolidation Calculator
Compare consolidating multiple debts into a single loan to see if you save money.
Amortization Schedule
Generate a full amortization schedule for any loan.
APR Calculator
Calculate the true APR of a loan including all fees and costs.
Boat Loan Calculator
Calculate monthly payments and total cost for a boat or marine loan.
HELOC Calculator
Calculate available credit and payments for a home equity line of credit.
Loan Comparison Calculator
Compare two loan options side by side to find the better deal.
Accelerated Debt Payoff Calculator
See how extra payments shorten your loan payoff and reduce total interest.
Investment
View allCompound Interest Calculator
See how your money grows over time with compound interest and regular contributions.
Investment Returns Calculator
Calculate your potential investment returns over different time horizons.
ROI Calculator
Calculate return on investment including annualized returns and net gain.
Dollar-Cost Averaging Calculator
Compare dollar-cost averaging vs lump sum investing to see which strategy wins.
Simple Interest Calculator
Calculate simple interest on a principal amount over time.
CAGR Calculator
Calculate the Compound Annual Growth Rate of an investment.
NPV Calculator
Calculate Net Present Value for investment decisions with multiple cash flows.
Future Value Calculator
Calculate the future value of a lump sum or annuity.
Present Value Calculator
Discount future money to find what it is worth today.
Millionaire Calculator
Find out how long it takes to reach $1 million (or any target).
Dividend Calculator
Calculate dividend income with DRIP reinvestment and dividend growth.
Dividend Yield Calculator
Calculate dividend yield from stock price and dividend payments.
Stock Profit Calculator
Calculate profit or loss from buying and selling stocks.
Bond Yield Calculator
Calculate current yield and yield to maturity for bonds.
WACC Calculator
Calculate the Weighted Average Cost of Capital for a company.
IRR Calculator
Calculate the internal rate of return for a series of cash flows.
DCF Calculator
Discounted cash flow valuation with 5-year projections.
Black-Scholes Calculator
Calculate option prices using the Black-Scholes model.
Sharpe Ratio Calculator
Calculate the Sharpe ratio for risk-adjusted investment returns.
Asset Allocation Calculator
Get a recommended portfolio allocation based on your risk tolerance.
Stock Option Calculator
Calculate employee stock option value with vesting schedule.
Municipal Bond Yield Calculator
Calculate tax-equivalent yield for municipal bonds.
Mutual Fund Expense Calculator
See how mutual fund fees impact your returns over time.
EPS Calculator
Calculate basic and diluted earnings per share.
1031 Exchange Calculator
Calculate tax deferral and reinvestment requirements for a 1031 like-kind exchange.
NUA Company Stock Calculator
Calculate tax savings using Net Unrealized Appreciation (NUA) for employer stock distributions.
Taxable vs Tax-Deferred Calculator
Compare investing in taxable, tax-deferred, and tax-free accounts.
Tax
View allIncome Tax Estimator
Estimate your federal income tax using current brackets and deductions.
Payroll Tax Calculator
Calculate take-home pay after federal, state, and FICA taxes.
Self-Employment Tax Calculator
Calculate self-employment tax (Schedule SE) including Social Security and Medicare.
Sales Tax Calculator
Calculate sales tax on any purchase amount.
Salary to Hourly Converter
Convert annual salary to hourly rate and see all pay period breakdowns.
Overtime Pay Calculator
Calculate overtime pay including 1.5x and 2x hourly rates.
Estate Tax Calculator
Estimate federal estate tax liability with exemptions and graduated rates.
Capital Gains Tax Calculator
Calculate short-term and long-term capital gains tax on investments.
Tax Bracket Calculator
Find your federal tax bracket and see marginal vs effective tax rates.
Earned Income Credit Calculator
Estimate your Earned Income Tax Credit (EITC) based on income and dependents.
Child Tax Credit Calculator
Calculate the Child Tax Credit based on number of children and income.
Charitable Giving Tax Calculator
Calculate tax savings from charitable donations and deductions.
Lottery Tax Calculator
Calculate taxes on lottery winnings with lump sum vs annuity comparison.
Hourly to Salary Calculator
Convert hourly wage to annual salary with overtime calculations.
Auto
View allLease vs Buy Calculator
Compare the total cost of leasing versus buying a car.
Fuel Cost Calculator
Compare fuel costs between vehicles by MPG, gas price, and annual miles driven.
Car Loan Payoff Calculator
See how extra payments help you pay off your car loan faster.
Car Depreciation Calculator
Estimate how much your car loses in value each year.
Auto Loan Refinance Calculator
Calculate savings from refinancing your auto loan to a lower interest rate.
Motorcycle Loan Calculator
Calculate monthly payments for a motorcycle loan with trade-in and taxes.
Car Affordability Calculator
Find out how much car you can afford based on your income and budget.
Car Lease Payment Calculator
Calculate car lease payments using capitalized cost, residual value, and money factor.
EV vs Gas Savings Calculator
Compare the operating costs of an electric vehicle versus a gas car.
MPG Calculator
Calculate your miles per gallon from fill-up data and see annual fuel costs.
Auto Rebate vs Low-Rate Financing
Compare taking a cash rebate versus choosing promotional low-rate financing.
RV / Camper Loan Calculator
Calculate monthly payments for an RV or camper loan including insurance and storage.
Horsepower Calculator
Calculate horsepower from torque and RPM using HP = Torque x RPM / 5252.
Tire Size Comparison
Compare tire sizes and see differences in diameter, width, sidewall height, and circumference.
Insurance
View allLife Insurance Needs Calculator
Calculate how much life insurance coverage you need based on income, debts, and dependents.
Disability Insurance Calculator
Calculate how much disability insurance coverage you need to protect your income.
Long-Term Care Cost Estimator
Estimate future long-term care costs for nursing homes, assisted living, and home care.
Fixed Annuity Payout Calculator
Calculate guaranteed payouts from a fixed annuity based on your investment and rate.
Variable Annuity Growth Projector
Project variable annuity growth including fees, expense ratios, and mortality charges.
Life Insurance Calculator (DIME Method)
Calculate detailed life insurance needs using the DIME method: Debt, Income, Mortgage, Education.
Business
View allBreak-Even Calculator
Find how many units you need to sell to cover your costs.
Profit Margin Calculator
Calculate gross, operating, and net profit margins from your revenue and costs.
Cash Flow Calculator
Project your business cash flow, burn rate, and runway over time.
Startup Cost Estimator
Estimate total startup costs and identify your funding gap.
DSCR Calculator
Calculate the debt service coverage ratio to evaluate loan qualification and financial health.
Business Valuation Calculator
Estimate your business value using revenue multiples and discounted cash flow methods.
Cost of Goods Sold Calculator
Calculate COGS and gross profit to understand your product profitability.
Contribution Margin Calculator
Calculate your contribution margin to understand how much each sale contributes to profit.
Payback Period Calculator
Calculate how long it takes for an investment to pay for itself.
Mileage Reimbursement Calculator
Calculate IRS mileage rate reimbursement for business, medical, or charity driving.
Inventory Turnover Calculator
Calculate inventory turnover ratio and days in inventory.
Working Capital Calculator
Calculate working capital and current ratio for your business.
Financial Ratios Calculator
Calculate key financial ratios for liquidity, profitability, and leverage.
Labor Cost Calculator
Calculate total labor cost per employee including benefits and taxes.
Equipment Buy vs Lease Calculator
Compare buying vs leasing business equipment.
Commercial Loan Calculator
Calculate commercial loan payments with balloon option.
Debt-to-Equity Calculator
Calculate the debt-to-equity ratio for your business.
Burn Rate Calculator
Calculate startup burn rate and cash runway.
CAC Calculator
Calculate customer acquisition cost and LTV:CAC ratio.
Churn Rate Calculator
Calculate customer churn rate and retention metrics.
SaaS Metrics Calculator
Calculate key SaaS metrics: MRR, ARR, LTV, and CAC ratio.
Depreciation Calculator
Calculate asset depreciation using straight-line, MACRS, double declining balance, SYD, or units of production methods.
Credit Card
View allCredit Card Payoff Calculator
Find out how long it will take to pay off your credit card and how much interest you will pay.
Balance Transfer Calculator
See if transferring your credit card balance to a 0% intro APR card saves money.
Minimum Payment Calculator
See how long it takes to pay off a credit card with minimum payments only.
Savings
View allSavings Goal Calculator
Find out how much to save each month to reach your financial goal.
Emergency Fund Calculator
Calculate how much you need in your emergency fund based on monthly expenses.
CD Calculator
Calculate certificate of deposit earnings with compounding interest.
Savings Calculator
Calculate how your savings grow with regular deposits and compound interest.
529 College Savings Calculator
Project your 529 plan growth and see if you'll have enough for college tuition.
College Cost Calculator
Project future college costs with inflation and savings growth.
CD Ladder Calculator
Build a CD ladder strategy for optimal liquidity and returns.
Cool Million Calculator
Calculate how long it takes to save one million dollars.
Lunch Savings Calculator
Calculate how much you save by bringing lunch instead of eating out.
Vice Savings Calculator
See how much you save by quitting a daily habit like coffee, smoking, or snacking.
Personal Finance
View allNet Worth Calculator
Calculate your net worth by subtracting liabilities from assets.
Debt-to-Income Calculator
Calculate your DTI ratio to understand your borrowing capacity.
Budget Calculator
Apply the 50/30/20 budgeting rule to your income and track spending.
Tip Calculator
Calculate tip amount and split the bill among friends.
Inflation Calculator
See how inflation erodes your purchasing power over time.
Pay Raise Calculator
Calculate your new salary after a raise and see the per-paycheck impact.
Cost of Living Calculator
Compare cost of living between cities and calculate equivalent salary.
Wedding Budget Calculator
Plan your wedding budget with per-category breakdowns.
Life Expectancy Calculator
Estimate your life expectancy based on age, sex, and lifestyle factors.
Student Budget Calculator
Plan a monthly budget as a college student with income and expense tracking.
Currency Converter
Convert between major world currencies using approximate exchange rates.
Rule of 72 Calculator
Estimate how long it takes to double your money at a given interest rate.
Health
View allBMI Calculator
Calculate your Body Mass Index from height and weight.
Calorie Calculator
Calculate daily calorie needs based on age, weight, height, and activity level.
HSA Calculator
Calculate HSA tax savings and projected balance over time.
TDEE Calculator
Calculate your Total Daily Energy Expenditure using the Harris-Benedict equation.
Macro Calculator
Calculate your ideal protein, carb, and fat macronutrient split.
Body Fat Calculator
Estimate your body fat percentage using the Navy method.
Ideal Weight Calculator
Find your ideal weight using Devine, Robinson, Miller, and Hamwi formulas.
Protein Calculator
Calculate daily protein needs based on weight and activity level.
BMR Calculator
Calculate Basal Metabolic Rate using Mifflin-St Jeor and Harris-Benedict equations.
Pregnancy Due Date Calculator
Estimate your pregnancy due date from your last menstrual period.
Ovulation Calculator
Estimate your ovulation date and fertility window.
BAC Calculator
Estimate blood alcohol content using the Widmark formula.
Sleep Calculator
Find optimal bedtimes and wake times based on sleep cycles.
Water Intake Calculator
Calculate your recommended daily water intake.
BMI Calculator for Kids
Calculate BMI for children with age and sex percentile interpretation.
Keto Macro Calculator
Calculate your ideal keto macros with high fat and low carb ratios.
Pregnancy Weight Gain Calculator
Calculate recommended weight gain by trimester during pregnancy.
Target Heart Rate Calculator
Calculate target heart rate training zones by age using the Karvonen method.
Child Height Predictor
Predict a child's adult height from parents' heights using the mid-parent method.
A1C Calculator
Convert A1C percentage to estimated average blood glucose (eAG) and vice versa.
Lean Body Mass Calculator
Calculate your lean body mass from total weight and body fat percentage.
Conception Date Calculator
Estimate the conception date from a due date or last menstrual period.
Real Estate
View allCap Rate Calculator
Calculate the capitalization rate to evaluate real estate investment returns.
Rental Property ROI Calculator
Calculate the total return on investment for a rental property including cash flow and appreciation.
Cost Segregation Calculator
Estimate tax savings from a cost segregation study by reclassifying building components into accelerated depreciation categories.
Real Estate Commission Calculator
Calculate agent commission splits for buyer and listing agents on a home sale.
Rent Increase Projector
Project how your rent will increase over time with annual rent hikes.
Price Per Square Foot Calculator
Calculate and compare price per square foot for properties and comparable sales.
Property Tax Calculator
Estimate annual property tax from assessed value and local mill rate.
ARV Calculator
Calculate the After Repair Value for house flipping and rehab projects.
Math
View allPercentage Calculator
Calculate percentages: find X% of Y, what percent X is of Y, or X is Y% of what.
Percentage Change Calculator
Calculate the percentage increase or decrease between two values.
Fraction Calculator
Add, subtract, multiply, and divide fractions with step-by-step results.
Square Root Calculator
Calculate the square root or nth root of any number.
Exponent Calculator
Calculate base raised to any power (base^exponent).
Logarithm Calculator
Calculate natural log (ln), log base 10, or logarithm with any custom base.
Scientific Notation Calculator
Convert numbers to and from scientific notation.
Significant Figures Calculator
Count significant figures in a number and round to a specific number of sig figs.
Quadratic Formula Calculator
Solve quadratic equations (ax² + bx + c = 0) and find the roots.
Pythagorean Theorem Calculator
Find the missing side of a right triangle using a² + b² = c².
Greatest Common Factor Calculator
Find the greatest common factor (GCF) of two numbers.
Least Common Multiple Calculator
Find the least common multiple (LCM) of two numbers.
Prime Factorization Calculator
Find the prime factors of any positive integer.
Slope Calculator
Calculate the slope of a line between two points.
Midpoint Calculator
Find the midpoint between two points on a coordinate plane.
Distance Formula Calculator
Calculate the distance between two points on a coordinate plane.
Area Calculator
Calculate the area of common shapes: circle, rectangle, triangle, and trapezoid.
Circumference Calculator
Calculate the circumference of a circle from its radius or diameter.
Volume Calculator
Calculate the volume of common 3D shapes: sphere, cylinder, cube, and cone.
Average Calculator
Calculate the mean, median, and mode from a list of numbers.
Weighted Average Calculator
Calculate the weighted average of values with different weights.
Decimal to Fraction Calculator
Convert a decimal number to its simplest fraction form.
Fraction to Decimal Calculator
Convert a fraction to its decimal and percentage equivalent.
Mixed Number Calculator
Convert between mixed numbers and improper fractions.
Proportion Calculator
Solve a/b = c/d for any missing value in a proportion.
Ratio Calculator
Simplify ratios and scale them to a desired total.
Golden Ratio Calculator
Calculate golden ratio relationships using phi (1.618...).
Factorial Calculator
Calculate factorial (n!), double factorial (n!!), and subfactorial (!n).
Triangle Calculator
Calculate triangle area, perimeter, and angles from three side lengths using Heron's formula and the law of cosines.
Trapezoid Calculator
Calculate the area and perimeter of a trapezoid from its bases, legs, and height.
Hexagon Calculator
Calculate the area, perimeter, and apothem of a regular hexagon from its side length.
Circle Calculator
Calculate circle area, circumference, diameter, and radius. Solve from any known value.
Ellipse Calculator
Calculate the area and approximate circumference of an ellipse from its semi-major and semi-minor axes.
Arc Length Calculator
Calculate the arc length of a circle from its radius and central angle in degrees or radians.
Sector Area Calculator
Calculate the area of a circular sector from its radius and central angle.
Surface Area Calculator
Calculate the surface area of common 3D shapes: cube, sphere, cylinder, and cone.
Perimeter Calculator
Calculate the perimeter of common shapes: rectangle, triangle, circle, and regular polygon.
Cylinder Volume Calculator
Calculate the volume and surface area of a cylinder from its radius and height.
Cone Volume Calculator
Calculate the volume and surface area of a cone from its radius and height.
Sphere Volume Calculator
Calculate the volume and surface area of a sphere from its radius.
Cube Calculator
Calculate the volume, surface area, and space diagonal of a cube from its side length.
Law of Cosines Calculator
Solve a triangle using the law of cosines for SSS (three sides) or SAS (two sides and included angle) cases.
Law of Sines Calculator
Solve a triangle using the law of sines for AAS (two angles + non-included side) or ASA (two angles + included side) cases.
Trigonometry Calculator
Calculate sin, cos, tan, and their inverses (arcsin, arccos, arctan) for any angle.
2x2 Matrix Calculator
Calculate the determinant, inverse, and product of 2x2 matrices.
Dot Product Calculator
Calculate the dot product of two vectors in 2D or 3D, plus the angle between them.
Cross Product Calculator
Calculate the cross product of two 3D vectors, including the resulting vector and its magnitude.
Vector Calculator
Calculate vector magnitude, unit vector, addition, and subtraction for 2D or 3D vectors.
Exponential Growth Calculator
Calculate exponential growth or decay using A = A0 * e^(kt).
Compound Growth Rate Calculator
Calculate compound growth rate for any value over time (CAGR for general use).
Doubling Time Calculator
Calculate doubling time using the Rule of 72 and the exact formula.
Percent Error Calculator
Calculate percent error from experimental and theoretical values.
Absolute Value Calculator
Calculate the absolute value and distance on the number line.
Long Division Calculator
Perform long division with a step-by-step solution showing all work.
Rounding Calculator
Round numbers to the nearest decimal place, significant figures, or integer.
Statistics
View allStandard Deviation Calculator
Calculate population and sample standard deviation from a data set.
Probability Calculator
Calculate basic probability from favorable outcomes divided by total outcomes.
Combination Calculator (nCr)
Calculate the number of combinations (nCr) for choosing r items from n.
Permutation Calculator (nPr)
Calculate the number of permutations (nPr) for arranging r items from n.
Z-Score Calculator
Calculate the z-score from a value, population mean, and standard deviation.
Confidence Interval Calculator
Calculate the confidence interval for a population mean.
P-Value Calculator
Calculate the p-value from a z-score or t-score for hypothesis testing.
Mean, Median, Mode Calculator
Calculate mean, median, and mode from a dataset of up to 10 values.
Variance Calculator
Calculate population and sample variance from a data set.
Margin of Error Calculator
Calculate the margin of error for surveys and polls.
Sample Size Calculator
Calculate the required sample size for a given confidence level and margin of error.
Correlation Coefficient Calculator
Calculate the Pearson correlation coefficient (r) from paired data.
Chi-Square Test Calculator
Perform a chi-square goodness-of-fit test comparing observed vs expected frequencies.
T-Test Calculator
Perform a one-sample t-test comparing a sample mean to a population mean.
One-Way ANOVA Calculator
Compare means of 3 groups using one-way analysis of variance (ANOVA).
Linear Regression Calculator
Compute slope, intercept, R-squared, and predictions from paired x,y data.
Binomial Distribution Calculator
Calculate P(X=k) and cumulative probabilities for a binomial distribution.
Normal Distribution Calculator
Calculate z-score, probability, and percentile for a normal distribution.
Poisson Distribution Calculator
Calculate P(X=k) and cumulative probabilities for a Poisson distribution.
IQR Calculator
Calculate the interquartile range (IQR) from a data set of up to 10 values.
Percentile Calculator
Find the percentile rank of a value in a data set.
Hypothesis Testing Calculator
Perform a z-test for hypothesis testing with a decision at your chosen significance level.
Bayes Theorem Calculator
Calculate P(A|B) using Bayes theorem from P(B|A), P(A), and P(B).
Expected Value Calculator
Calculate the expected value from outcomes and their probabilities.
Outlier Calculator
Detect outliers in a data set using the IQR method.
Box Plot Calculator
Calculate box plot statistics: min, Q1, median, Q3, and max from a data set.
Histogram Calculator
Generate frequency distribution from data with configurable number of bins.
Fitness
View allHeart Rate Zone Calculator
Calculate training heart rate zones using the Karvonen method.
1RM Calculator
Calculate your one-rep max from weight and reps using Brzycki and Epley formulas.
Pace Calculator
Convert between pace, time, and distance for running and walking.
Calories Burned Calculator
Estimate calories burned by activity and duration using MET values.
Walking Calories Calculator
Calculate calories burned while walking based on speed, weight, and duration.
VO2 Max Calculator
Estimate your VO2 max from running test data.
Construction
View allSquare Footage Calculator
Calculate the square footage of rooms, walls, and irregularly shaped areas.
Concrete Calculator
Calculate cubic yards of concrete needed for slabs, footings, and columns.
Paint Calculator
Calculate gallons of paint needed for a room including walls and ceiling.
Roofing Calculator
Calculate roofing squares, bundles of shingles, and materials needed.
Flooring Calculator
Calculate flooring material needed with waste factor for any room.
Drywall Calculator
Calculate sheets of drywall needed for walls and ceilings.
Fence Calculator
Calculate fence materials including posts, rails, pickets, and concrete.
Gravel Calculator
Calculate tons of gravel, rock, or fill material needed for a project.
Tile Calculator
Calculate the number of tiles needed with waste factor and grout.
Deck Stain Calculator
Calculate gallons of stain or sealer needed for a deck.
Insulation Calculator
Calculate insulation batts or rolls needed with R-value selection.
Brick Calculator
Calculate the number of bricks and mortar needed for a wall or project.
Stair Calculator
Calculate stair rise, run, and number of steps from total height.
Ramp Calculator
Calculate ADA-compliant ramp length from height using 1:12 ratio.
Wallpaper Calculator
Calculate rolls of wallpaper needed for a room.
Board Foot Calculator
Calculate board feet from lumber dimensions and quantity.
Carpet Calculator
Calculate carpet square yards needed and estimate cost.
Paver Calculator
Calculate the number of pavers needed for a patio or walkway.
Roof Pitch Calculator
Calculate roof pitch angle and multiplier from rise and run.
Pool Volume Calculator
Calculate pool water volume in gallons for rectangular and round pools.
Concrete Driveway Cost Calculator
Estimate the cost of a concrete driveway including materials and labor.
Asphalt Calculator
Calculate tons of asphalt needed for a paving project.
Snow Load Calculator
Calculate roof snow load in pounds per square foot (psf) from depth and density.
AC BTU Calculator
Calculate the right air conditioner size (BTU) for your room.
Topsoil Calculator
Calculate cubic yards of topsoil needed for a garden or lawn project.
Lumber Calculator
Calculate board feet, total cost, and quantities for lumber projects.
Retaining Wall Calculator
Calculate the number of blocks and cost for a retaining wall.
Tank Volume Calculator
Calculate the volume of a cylindrical, rectangular, or oval tank.
Physics
View allOhm's Law Calculator
Calculate voltage, current, or resistance using Ohm's Law (V = IR).
Speed Distance Time Calculator
Solve for speed, distance, or time using the formula Speed = Distance / Time.
Force Calculator (F=ma)
Calculate force, mass, or acceleration using Newton's Second Law F = ma.
Acceleration Calculator
Calculate acceleration from initial velocity, final velocity, and time.
Kinetic Energy Calculator
Calculate kinetic energy using KE = 1/2 mv².
Potential Energy Calculator
Calculate gravitational potential energy using PE = mgh.
Density Calculator
Calculate density, mass, or volume using Density = Mass / Volume.
Momentum Calculator
Calculate momentum using p = mv (mass times velocity).
Free Fall Calculator
Calculate free fall distance, velocity, and time for an object dropped from height.
Pressure Calculator
Calculate pressure from force and area using P = F/A.
Power Calculator (Watts)
Calculate electrical power using P = VI, P = I²R, or P = W/t.
Frequency Calculator
Calculate frequency from period and vice versa (f = 1/T).
Wavelength Calculator
Calculate wavelength from wave speed and frequency (lambda = v/f).
Voltage Divider Calculator
Calculate voltage divider output using Vout = Vin x R2/(R1+R2).
Resistor Color Code Calculator
Find resistor value from color bands (4-band and 5-band).
Wire Gauge (AWG) Calculator
Find AWG wire ampacity, diameter, and resistance per foot.
LED Resistor Calculator
Calculate the current-limiting resistor needed for an LED circuit.
Torque Calculator
Calculate torque using the formula τ = F × r × sin(θ).
Work Calculator
Calculate mechanical work using W = F × d × cos(θ).
Spring Constant Calculator
Calculate spring constant using Hooke's Law F = kx.
Pendulum Calculator
Calculate the period of a simple pendulum using T = 2π√(L/g).
Centripetal Force Calculator
Calculate centripetal force using F = mv²/r.
Coulomb's Law Calculator
Calculate electrostatic force using Coulomb's Law F = kq₁q₂/r².
Capacitance Calculator
Calculate capacitance, charge, voltage, and energy stored using Q = CV.
Snell's Law Calculator
Calculate refraction angle using Snell's Law n₁sin(θ₁) = n₂sin(θ₂).
Doppler Effect Calculator
Calculate observed frequency from source and observer velocities.
Buoyancy Calculator
Calculate buoyant force using Archimedes' principle F_b = ρVg.
Bernoulli Equation Calculator
Apply Bernoulli's principle: P + ½ρv² + ρgh = constant.
Flow Rate Calculator
Calculate volume flow rate using Q = A × v.
Gear Ratio Calculator
Calculate gear ratio from teeth counts, speed, and torque conversion.
Pulley Calculator
Calculate mechanical advantage of pulley systems.
Escape Velocity Calculator
Calculate escape velocity using v = √(2GM/r).
Orbital Velocity Calculator
Calculate orbital velocity using v = √(GM/r).
E=mc² Calculator
Calculate energy-mass equivalence using Einstein's E = mc².
Decibel Calculator
Calculate decibels from power or intensity ratios.
Speed of Sound Calculator
Calculate the speed of sound in air at different temperatures.
Hooke's Law Calculator
Calculate force, displacement, and elastic potential energy using Hooke's Law F = kx.
Voltage Drop Calculator
Calculate voltage drop across a wire run based on length, gauge, and current.
Friction Force Calculator
Calculate friction force from normal force and coefficient of friction.
Chemistry
View allHalf-Life Calculator
Calculate radioactive or exponential decay half-life, remaining amount, and decay constant.
Molarity Calculator
Calculate molarity (moles per liter) and perform dilution calculations (C1V1 = C2V2).
pH Calculator
Calculate pH from H+ concentration and convert between pH, pOH, [H+], and [OH-].
Molar Mass Calculator
Calculate molar mass from element atomic weights and their quantities in a compound.
Dilution Calculator
Calculate dilution using C1V1 = C2V2 equation. Find any missing variable.
Titration Calculator
Calculate titration endpoint including molarity, volume, and equivalence point.
Boiling Point Elevation Calculator
Calculate boiling point elevation using ΔTb = Kb x m x i.
Freezing Point Depression Calculator
Calculate freezing point depression using ΔTf = Kf x m x i.
Gibbs Free Energy Calculator
Calculate Gibbs free energy using ΔG = ΔH - TΔS.
Equilibrium Constant Calculator
Calculate the equilibrium constant (Keq) from product and reactant concentrations.
Percent Yield Calculator
Calculate percent yield from actual and theoretical yield values.
Theoretical Yield Calculator
Calculate theoretical yield from stoichiometry, reactant mass, and molar masses.
Empirical Formula Calculator
Determine the empirical formula from mass percentages of elements.
Radioactive Decay Calculator
Calculate remaining amount using N(t) = N0 x (1/2)^(t/t1/2).
Nernst Equation Calculator
Calculate cell potential using E = E0 - (RT/nF)ln(Q).
Osmotic Pressure Calculator
Calculate osmotic pressure using the formula pi = MRT.
Ideal Gas Law Calculator
Solve PV = nRT for any variable — pressure, volume, moles, or temperature.
Beer-Lambert Law Calculator
Calculate absorbance using A = εbc (molar absorptivity, path length, concentration).
Everyday Life
View allAge Calculator
Calculate your exact age in years, months, and days from your birthdate.
Date Calculator
Find days between two dates or add/subtract days from a date.
Time Calculator
Add or subtract hours, minutes, and seconds.
Time Zone Converter
Convert time between time zones using UTC offset hours.
Electricity Cost Calculator
Calculate electricity cost from watts, hours of use, and rate per kWh.
Unit Price Calculator
Compare unit prices of different package sizes to find the best deal.
Discount Calculator
Calculate discount amount and final price after a percentage discount.
GPA Calculator
Calculate GPA from grades and credit hours.
Grade Calculator
Calculate what grade you need on your final exam to get your desired grade.
Random Number Generator
Generate random numbers within a specified range.
Dice Roller
Roll dice with configurable number of dice and sides.
Coin Flip Simulator
Flip coins and see the distribution of heads and tails.
Speed Calculator
Calculate speed from distance and time, or solve for any variable.
Drive Time Calculator
Calculate drive time from distance and average speed.
Food & Cooking
View allCooking Unit Converter
Convert between cups, tablespoons, teaspoons, ml, and fluid ounces.
Grams to Cups Converter
Convert grams to cups for common baking ingredients.
Turkey Cooking Time Calculator
Calculate turkey cooking time by weight and method.
Pizza Size Calculator
Compare pizza sizes by area to find the best deal.
ABV Calculator
Calculate alcohol by volume from original and final gravity.
Coffee-to-Water Ratio Calculator
Calculate the perfect coffee-to-water ratio for any brew method.
Sourdough Calculator
Baker's percentage calculator for sourdough bread recipes.
Steak Cooking Time Calculator
Calculate steak cooking time by thickness and desired doneness.
Recipe Scaler
Scale recipe ingredients up or down by changing the number of servings.
BBQ Meat Calculator
Calculate how much meat to buy per person for a barbecue.
Cake Serving Calculator
Estimate how many servings you can get from a round or sheet cake.
Ecology & Energy
View allSolar Panel Calculator
Estimate solar panel system size, cost, and savings for your home.
Carbon Footprint Calculator
Estimate your personal annual carbon footprint from driving, energy, and diet.
Electricity Usage Calculator
Estimate home electricity usage and cost by appliance.
Wind Turbine Calculator
Estimate wind turbine power output based on wind speed and rotor diameter.
EV Range Calculator
Estimate electric vehicle range based on battery size, efficiency, and conditions.
Conversions
View allTemperature Converter
Convert between Fahrenheit, Celsius, and Kelvin.
Length Converter
Convert between inches, feet, yards, miles, millimeters, centimeters, meters, and kilometers.
Weight Converter
Convert between ounces, pounds, grams, kilograms, stone, and tons.
Speed Converter
Convert between mph, km/h, m/s, and knots.
Hex to Decimal Converter
Convert between hexadecimal, decimal, binary, and octal number bases.
Binary to Decimal Converter
Convert binary numbers to decimal and decimal to binary.
Cups to Ounces Converter
Convert between cups, fluid ounces, milliliters, and liters.
Biology
View allBlood Type Inheritance Calculator
Predict possible blood types of offspring from parent blood types.
Punnett Square Calculator
Generate a monohybrid Punnett square showing genotype and phenotype ratios.
Hardy-Weinberg Equilibrium Calculator
Calculate allele and genotype frequencies using Hardy-Weinberg equations.
Population Growth Calculator
Model exponential and logistic population growth over time.
Generation Time Calculator
Calculate bacterial generation (doubling) time from growth data.
Pets & Animals
View allDog Age Calculator
Convert your dog's age to human years using the modern veterinary formula.
Cat Age Calculator
Convert your cat's age to human years using veterinary guidelines.
Chocolate Toxicity Calculator for Dogs
Determine if your dog ate a dangerous amount of chocolate based on weight, type, and amount.
Dog Food Calculator
Calculate the right daily food amount for your dog based on weight, age, and activity level.
Pet Cost Calculator
Estimate the annual cost of owning a pet including food, veterinary care, grooming, and insurance.
Dog Pregnancy Calculator
Calculate your dog's due date and track pregnancy weeks from the breeding date.
Gardening
View allMulch Calculator
Calculate how many cubic yards of mulch you need for your garden or landscape beds.
Soil Calculator
Calculate cubic yards of soil, topsoil, or fill dirt needed for your project.
Grass Seed Calculator
Calculate how much grass seed you need based on lawn size and seeding type.
Raised Bed Soil Calculator
Calculate how much soil to fill raised garden beds of various shapes.
Fertilizer Calculator
Calculate how much fertilizer to apply based on N-P-K ratio and lawn or garden size.
Plant Spacing Calculator
Calculate how many plants fit in your garden bed and the optimal grid layout.
Compost Calculator
Calculate how much compost you need for garden beds and landscaping.
Clothing & Sizing
View allShoe Size Converter
Convert shoe sizes between US, UK, EU, and centimeters.
Ring Size Calculator
Find your ring size from finger circumference or diameter measurement.
Bra Size Calculator
Calculate your bra size from band and bust measurements.
Hat Size Calculator
Find your hat size from head circumference in inches or centimeters.
Dress Size Calculator
Find your dress size in US, UK, and EU from bust, waist, and hip measurements.
Weather
View allWind Chill Calculator
Calculate wind chill factor from air temperature and wind speed.
Heat Index Calculator
Calculate the heat index (feels-like temperature) from air temperature and humidity.
Dew Point Calculator
Calculate the dew point temperature from air temperature and relative humidity.
Sunrise & Sunset Calculator
Estimate approximate sunrise and sunset times from your latitude and date.
Technology
View allPassword Generator
Generate secure random passwords with customizable length and character types.
IP Subnet Calculator
Calculate subnet mask, network address, broadcast, and usable host range from CIDR.
Color Converter
Convert colors between HEX, RGB, and HSL formats.
Bandwidth Calculator
Calculate download time from file size and internet speed.
Aspect Ratio Calculator
Calculate aspect ratio from width and height, or find missing dimensions.
Data Storage Converter
Convert between bytes, KB, MB, GB, TB, and PB.
PPI Calculator
Calculate pixels per inch from screen resolution and display size.
URL Encoder / Decoder
Encode or decode text for safe use in URLs.
Text & Word Tools
View allWord Counter
Count words, characters, sentences, and paragraphs in your text.
Character Counter
Count characters with and without spaces, plus social media character limits.
Text Case Converter
Convert text to UPPERCASE, lowercase, Title Case, or Sentence case instantly.
Random Name Picker
Enter a list of names and randomly pick one or more winners.
Sports
View allGolf Handicap Calculator
Estimate your golf handicap index from recent round scores.
Batting Average Calculator
Calculate baseball batting average, on-base percentage, and slugging percentage.
Bowling Score Calculator
Calculate your bowling score with a simple frame-by-frame entry.
Swimming Pace Calculator
Calculate swimming pace per 100m or 100yd from distance and time.
Cycling Power Calculator
Estimate cycling power (watts) from speed, weight, and gradient.