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CD Calculator

Enter your deposit, the CD’s APY and its term in months to see what the certificate will be worth at maturity and how much interest it earns. If the bank quotes a plain interest rate instead of an APY, switch the rate type and choose the compounding frequency.

Quick examples
$
%
months
Your numbers stay in your browser. Nothing is uploaded.
Value at maturity$10,450.00
Interest earned
$450.00
APY
4.5%

Saved setups

Save a set of inputs you reuse — your usual rate, your loan, your room sizes — and load it back in one tap.

    Your recent calculations

    Results you calculate here are kept on this device so you can come back to them.

      Formula

      Value at maturity = deposit × (1 + APY)^(months ÷ 12)
      From an interest rate: APY = (1 + rate ÷ n)^n − 1, with n compounding periods per year
      Interest earned = value at maturity − deposit

      How to use it

      1. Enter the amount you will deposit.
      2. Enter the APY from the bank’s rate sheet.
      3. Enter the term in months and read the maturity value.

      Worked examples

      A $10,000 12-month CD at 4.5% APY

      Value at maturity
      $10,450.00
      Interest earned
      $450.00
      APY
      4.5%

      A $5,000 5-year CD at 4% APY

      Value at maturity
      $6,083.26
      Interest earned
      $1,083.26
      APY
      4%

      A $10,000 18-month CD at a 5% interest rate compounded monthly

      Value at maturity
      $10,777.16
      Interest earned
      $777.16
      APY
      5.116%

      Things the rate sheet does not show

      Taking money out before maturity normally triggers an early-withdrawal penalty, commonly several months of interest, which can eat into principal on a young CD. Check the penalty before you commit money you might need.

      CD interest is taxable as ordinary income in the year it is credited, even if the CD has not matured. Bank CDs are FDIC-insured up to $250,000 per depositor, per bank, per ownership category.

      CD ladders

      Splitting a deposit across several terms — for example equal parts in 1-, 2-, 3-, 4- and 5-year CDs — means one matures every year. You get access to part of the money regularly while most of it earns longer-term rates.

      Questions people ask

      How much does a $10,000 CD earn in a year?

      At 4.5% APY it earns $450 and is worth $10,450 at maturity. At 5% APY it earns $500.

      How much interest does a 6-month CD pay?

      About half the APY. $10,000 in a 6-month CD at 5% APY earns $246.95.

      What is a $5,000 5-year CD worth at maturity?

      At 4% APY, $6,083.26 — $1,083.26 of interest.

      Related calculators

      APY CalculatorConvert an interest rate and compounding frequency into APY.Savings CalculatorHow much your savings will be worth with regular monthly deposits.Compound Interest CalculatorGrow a balance with compound interest and optional monthly deposits.Interest CalculatorInterest earned or owed on a balance — simple or compound, side by side.Future Value CalculatorFuture value of a lump sum and regular deposits at a given rate.