CD calculator

Estimate a certificate of deposit’s maturity balance from the deposit, quoted APY and term in months.

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Deposit

Annual percentage yield (%)

More inputs and assumptions

Term in months

Answer

…

Maturity balance = deposit × (1 + APY/100)^(months/12). Interest = maturity balance − deposit.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

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Formula and assumptions

Uses an unchanged effective annual yield and proportional years (months ÷ 12). Actual day counts, early-withdrawal penalties, taxes and institution rounding are excluded. APY already includes compounding; do not enter the nominal interest rate.

Automatic precision shows money to two decimal places and other numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-26

Using CD calculator

Maturity balance = deposit × (1 + APY/100)^(months/12). Interest = maturity balance − deposit.

Next: Calculate APY

A worked example

Example inputs: deposit = 1000, annual percentage yield (%) = 5, term in months = 12. Balance at maturity = 1050.

Before you use the result

Example results for deposit

These examples use Annual percentage yield (%): 5; Term in months: 12. They are reference calculations, not recommended settings.

Deposit	Balance at maturity
500	525.00
1000	1,050.00
2000	2,100.00

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ToolOctopus. “CD calculator.” Updated 2026-09-26. https://tooloctopus.com/cd-calculator.

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