Finance
Calculate your certificate of deposit maturity value and interest earnings based on deposit amount, APY, term, and compounding frequency.
Maturity value
$10,940$
Based on the compound interest formula A = P × (1 + r/n)^(n×t), where n is the compounding frequency per year and t is time in years.
A certificate of deposit (CD) is a fixed-term savings product offered by banks and credit unions where you deposit money and agree not to withdraw it for a set period (term). In exchange, the institution pays you a fixed interest rate, typically higher than regular savings accounts. Your money earns interest at regular intervals (daily, monthly, quarterly, etc.) based on the compounding frequency, and at maturity, you receive your principal plus all accumulated interest.
The calculator applies the compound interest formula to compute your CD's final value. You input your initial deposit, the annual percentage yield (APY) offered by your bank, the term in months, and how frequently interest is compounded (annual, semi-annual, quarterly, monthly, or daily). The formula calculates interest earned during each compounding period and adds it to the principal, so you earn interest on your interest—a process called compounding.
A = P × (1 + r/n)^(n×t)
Where: A = maturity value, P = principal (deposit), r = annual interest rate (decimal), n = compounding frequency per year, t = time in yearsThe exponent (n×t) represents the total number of compounding periods over your CD's life. Each period, the interest rate r/n is applied to the growing balance. More frequent compounding (daily vs. annual) yields slightly higher returns because interest is calculated and added more often, allowing you to earn interest on interest sooner.
| Input | Result | Notes |
|---|---|---|
| $10,000 deposit, 4.5% APY, 24-month term, monthly compounding | $10,945 maturity value | Interest earned: $945 over 2 years; monthly compounding gives slightly better returns than annual |
| $5,000 deposit, 5.2% APY, 12-month term, daily compounding | $5,261 maturity value | Interest earned: $261 in one year; daily compounding maximizes interest accumulation |
| $50,000 deposit, 4.0% APY, 60-month term, quarterly compounding | $61,051 maturity value | Interest earned: $11,051 over 5 years; larger deposits and longer terms amplify total interest |
APY (Annual Percentage Yield) includes the effect of compounding and is what your money will actually earn. APR (Annual Percentage Rate) is the base rate before compounding. Banks advertise APY for CDs because it's more accurate; always use APY for calculations.
Most CDs impose an early withdrawal penalty, typically 3–6 months of interest (or sometimes a small percentage of principal). Some high-yield savings accounts or no-penalty CDs offer better flexibility but lower rates. Always check your CD's terms before opening.
Daily compounding calculates and adds interest 365 times per year; monthly only 12 times. Over a 5-year CD, daily compounding might yield $50–100 more on a $10,000 deposit compared to monthly. The difference grows with larger deposits and longer terms.
CDs are very safe because they're FDIC-insured (in the US) up to $250,000 per institution. Unlike stocks or bonds, your principal is guaranteed, and interest rates are fixed. The only risk is opportunity cost—if rates rise, your locked rate may look unattractive.
Short-term CDs (3–12 months) offer flexibility but lower rates. Long-term CDs (3–5 years) lock in higher rates but immobilize your money. During rising rate environments, consider laddering—spread funds across multiple terms to balance returns and liquidity.
CD interest is taxable as ordinary income. If your tax bracket is 24%, a 5% APY CD nets you about 3.8% after tax. Use your marginal tax rate and subtract it from the interest earned to estimate your real after-tax return.