MasterTool

CD Calculator

Calculate cd from your own entered figures.

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Currency: Amounts are calculated in the currency you select; this site does not convert between currencies and does not use live exchange rates.

What this tool does

Calculate cd from your own entered figures. APY is treated as an effective annual yield; the penalty estimate uses simple interest on principal — your bank's penalty formula and any principal invasion may differ.

How to use the CD Calculator

  1. Enter or select cd principal.
  2. Enter or select cd apy (%).
  3. Enter or select term (months).
  4. Enter or select early-withdrawal penalty (months of interest).
  5. Read the calculated result; change any measurement to compare alternatives.

Formula

maturity value = principal × (1 + APY)^(months/12); early-withdrawal penalty ≈ principal × APY × penalty months/12
principal
CD principal
apy
CD APY (%)
months
Term (months)
penalty
Early-withdrawal penalty (months of interest)

APY is treated as an effective annual yield; the penalty estimate uses simple interest on principal — your bank's penalty formula and any principal invasion may differ.

Worked example

For cd calculator, the following measurements illustrate the exact method: CD principal: 10000; CD APY (%): 4.5; Term (months): 12; Early-withdrawal penalty (months of interest): 3.

Inputs

  • CD principal10000
  • CD APY (%)4.5
  • Term (months)12
  • Early-withdrawal penalty (months of interest)3

Result

  • Value at maturity$10,450.00
  • Interest earned at maturity$450.00
  • Estimated early-withdrawal penalty$112.50
  • Principal minus penalty$9,887.50

Results explained

Value at maturity
Value at maturity from the formula above. APY is treated as an effective annual yield; the penalty estimate uses simple interest on principal — your bank's penalty formula and any principal invasion may differ.
Interest earned at maturity
Interest earned at maturity from the formula above. APY is treated as an effective annual yield; the penalty estimate uses simple interest on principal — your bank's penalty formula and any principal invasion may differ.
Estimated early-withdrawal penalty
Estimated early-withdrawal penalty from the formula above. APY is treated as an effective annual yield; the penalty estimate uses simple interest on principal — your bank's penalty formula and any principal invasion may differ.
Principal minus penalty
Principal minus penalty from the formula above. APY is treated as an effective annual yield; the penalty estimate uses simple interest on principal — your bank's penalty formula and any principal invasion may differ.

Frequently asked questions

maturity value = principal × (1 + APY)^(months/12); early-withdrawal penalty ≈ principal × APY × penalty months/12

APY is treated as an effective annual yield; the penalty estimate uses simple interest on principal — your bank's penalty formula and any principal invasion may differ.

No. All numbers are entered by you or come from the dated reference table shown on this page; calculations run locally.

This is an estimate, not financial, tax or legal advice. Verify the inputs and output with official sources and a qualified professional.

Check period consistency, currency, percentage inputs and the assumptions: APY is treated as an effective annual yield; the penalty estimate uses simple interest on principal — your bank's penalty formula and any principal invasion may differ.