CD Calculator
See how much your certificate of deposit (CD) will earn at maturity. Enter your deposit amount, APY, term, and compounding frequency to calculate total interest earned. Also see the cost of early withdrawal.
A Certificate of Deposit (CD) is a savings product that locks money in for a fixed term in exchange for a guaranteed interest rate, usually higher than a savings account. CDs are FDIC-insured up to $250,000 per depositor per bank, making them one of the lowest-risk places to park cash you don't need for the term length.
This calculator computes the value of a CD at maturity given a deposit amount, APY, term length, and compounding frequency. It also estimates the cost of an early withdrawal, which is typically a few months of interest depending on the term.
CDs make sense for money with a known timeline: a planned car purchase next year, a tuition payment in 18 months, an emergency-fund overflow you want to earn more on. They're less useful for money you might need on short notice (the penalty erases gains) or money with a 5+ year horizon (stock-market returns historically beat CDs over those periods).
Inputs
Results
Value at Maturity
$10,460.25
Total Interest Earned
$460.25
Effective APY
4.602%
Early Withdrawal Penalty
$115.06
Maturity Value Breakdown
Full Term vs Early Withdrawal
Formula
How to use this calculator
- Enter the deposit amount. Minimum is usually $500–$1,000 at most banks; jumbo CDs typically start at $100K with slightly better rates.
- Enter the APY offered. As of 2026, CD rates range roughly 3.5–5.5% depending on term and bank.
- Choose the term length. Longer terms historically offer higher rates, but watch the curve — sometimes 12-month CDs pay more than 5-year ones (an "inverted" curve).
- Choose compound frequency. Most CDs compound daily; the math difference between daily and monthly is small (a few basis points).
- Estimate the early-withdrawal penalty (in months of interest). Typical: 3 months for 1-year CDs, 6 months for 2–5 year CDs.
- For laddering strategies (multiple CDs maturing at different times), run the calculator per CD.
Worked examples
12-month CD
$10,000 at 4.5% APY, 12 months, daily compounding. Final value: $10,460 Interest earned: $460 After-tax (22% federal bracket): ≈ $360 actual gain. Slightly above-inflation in a 3% inflation environment.
CD ladder
Split $50,000 into five $10,000 CDs maturing at 1, 2, 3, 4, and 5 years. At maturity, reinvest each into a new 5-year CD. After year 5, you have a "ladder" where one CD matures every year — providing liquidity, while the bulk earns 5-year rates. This balances higher long-term rates against having some money accessible each year.
When to use this calculator
Use CDs for money with a known timeline that you want guaranteed and FDIC-insured. They work especially well for: - Emergency-fund overflow (the portion above 3 months you wouldn't touch in a small emergency) - House down payment savings 12–36 months out - College tuition payments 1–4 years out - Anyone uncomfortable with stock market volatility
CDs are NOT ideal for: - Truly emergency money (penalty erases gains) - Long-term retirement savings (stocks/index funds beat CDs over decades) - Money you might need on short notice
Compare CD rates across at least 3 banks and credit unions. Online banks consistently offer higher CD rates than traditional brick-and-mortar; brokered CDs through Fidelity/Vanguard/Schwab offer even higher rates but with secondary-market complexity.
For maximum flexibility, consider "no-penalty CDs" (lower rate, but withdraw any time after 7 days) or money market funds (slightly lower rate, fully liquid).
Common mistakes to avoid
- Confusing APR with APY. APY accounts for compounding; APR doesn't. CDs are quoted in APY — that's the right number to compare.
- Forgetting taxes. Interest is taxed as ordinary income at your marginal rate. 4.5% APY in a 22% bracket nets ~3.5%.
- Locking long when rates are rising. If you commit to a 5-year CD at 4% and rates jump to 5.5%, the penalty for breaking the CD usually doesn't justify chasing the new rate.
- Auto-renewing without checking. Many banks auto-renew CDs at maturity at the prevailing rate (often worse than your original). Set a calendar reminder.
- Choosing one bank for everything. Each FDIC-insured account at separate banks gets its own $250K coverage. Spread money for very large balances.
- Not exploring brokered CDs. Brokerage CDs (Fidelity, Vanguard, Schwab) often offer better rates and easier secondary-market trading.
Frequently Asked Questions
Sources & further reading
- Certificate of Deposit (CD) basics — Federal Deposit Insurance Corporation
- National rates and rate caps — Federal Deposit Insurance Corporation