CD Calculator

A certificate of deposit (CD) is a time deposit offered by banks and credit unions. You lock in a fixed APY for a set term—often three months to five...

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Introduction

A certificate of deposit (CD) is a time deposit offered by banks and credit unions. You lock in a fixed APY for a set term—often three months to five years—and receive your principal plus interest at maturity. CDs are popular when you want predictable returns without stock market volatility. Unlike a savings account, early withdrawal usually triggers a penalty. That trade-off is why CDs often pay more than everyday savings for the same institution.

What Is a Certificate of Deposit?

A certificate of deposit (CD) is a time deposit offered by banks and credit unions. You lock in a fixed APY for a set term—often three months to five years—and receive your principal plus interest at maturity. CDs are popular when you want predictable returns without stock market volatility.

Unlike a savings account, early withdrawal usually triggers a penalty. That trade-off is why CDs often pay more than everyday savings for the same institution.

How CD Interest Compounds

Most CDs compound daily and credit interest monthly or at maturity. Enter your deposit, quoted APY, term length, and compounding frequency to see ending balance and total interest. APY already reflects compounding, so you do not need to adjust the rate manually.

Choosing a CD Term

Shorter terms offer flexibility when rates are rising. Longer terms lock today's yield when you expect rates to fall. A CD ladder—splitting deposits across staggered maturities—balances liquidity with yield. Read our CD ladder guide for a step-by-step plan.

  • 3-6 months: parking cash before a known expense.
  • 1-2 years: moderate yield with manageable lock-up.
  • 3-5 years: maximum rate when you will not need the funds soon.

FDIC Insurance and Safety

FDIC-insured banks protect deposits up to $250,000 per depositor, per ownership category. Verify coverage on large balances or joint accounts. Our FDIC insurance explainer walks through common ownership structures.

Early Withdrawal Penalties

Penalties are often stated as months of interest on the amount withdrawn. Before breaking a CD, compare the penalty to interest you would earn elsewhere. Our early withdrawal guide shows how to estimate the true cost.

Related Calculators

Compare growth paths with the Compound Interest Calculator and Savings Calculator. For taxable brokerage projections, try the Investment Calculator.

How It Works

  1. Enter your amounts, rates, and term in the form. Use the same units shown in the labels (dollars, years, percent).
  2. Click Calculate to run the CD Calculator engine. Invalid or empty required fields show a clear error message.
  3. Review the summary cards for the key outputs. Expand schedules or tables when available for period-by-period detail.
  4. Copy, print, or share your scenario link. Reset the form anytime to start a fresh comparison.

Formula

Future Value with compounding: FV = P(1 + r/n)^(nt). For periodic deposits, each contribution grows from its deposit date at the same periodic rate.

FAQ

Yes. CDCalculator.io provides the CD Calculator at no charge for personal and educational use. Results are estimates and not financial advice.

The tool uses standard formulas lenders and planners use in spreadsheets. Your bank may round differently or include fees not modeled here.

Use the Copy Results and Print buttons on the calculator panel after you run a scenario. You can also share the page link with colleagues.

Focus on realistic rates, terms, and any extra payments or contributions. Small changes in APR or time horizon often move outcomes more than rounding.

No. Use this calculator to explore scenarios, then consult a qualified advisor or lender for decisions about investment products.