Chemistry Calculators
Molarity, pH, half-life, and chemical calculations
Half-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).
About our chemistry calculators
Chemistry calculators on CalcMountain handle the standard quantitative work of general, organic, analytical, and physical chemistry. Whether you're a high school student working through stoichiometry homework, a college lab preparing buffer solutions, or a practicing chemist running through routine calculations, the formulas here follow the same conventions taught in the standard textbooks.
For solutions and concentrations, we have molarity, dilution (M₁V₁ = M₂V₂), and pH/pOH calculators. The pH calculator handles strong acids and bases directly, and weak acids/bases via the Henderson-Hasselbalch equation. The molar mass calculator computes molecular weights from chemical formulas using standard IUPAC atomic weights.
Reaction-stoichiometry calculators address percent yield, theoretical yield, empirical formula determination, and titration endpoint calculations. The radioactive decay and half-life calculators support nuclear chemistry and isotope-dating applications using the standard N(t) = N₀ × 0.5^(t/t½) form.
Thermodynamics and equilibrium coverage includes Gibbs free energy (ΔG = ΔH - TΔS), the equilibrium constant K, the Nernst equation for electrochemical cells, and ideal gas law calculations. The Beer-Lambert law calculator supports analytical chemistry and spectroscopy (also appears in the optics category for the same equation applied to optical density).
For colligative properties (the chemistry of dilute solutions), we have boiling point elevation, freezing point depression, and osmotic pressure calculators. These follow the standard Δ = i × K × m form using molality and the van't Hoff factor.
Atomic weights are current IUPAC values. Thermodynamic data, when needed, comes from the NIST WebBook for gas-phase thermochemistry. pKa values for common acids use standard reference values; lab-specific conditions (temperature, ionic strength) may produce small variations. For research-grade quantitative work, always validate against your specific experimental conditions and reference literature.