CD calculator
Project a fixed-rate deposit held to maturity with interest reinvested.
Formula
Maturity = principal × (1 + rate/(100 × n))^(n × years); APY = ((1 + rate/(100 × n))^n − 1) × 100%
Maturity balance ≈ (1,000)×(1+(5)÷100÷(12))^((12)×(1)) · Interest earned ≈ (1,051.161898)-(1,000) · Effective annual yield ≈ 100×((1+(5)÷100÷(12))^(12)-1)
How to use
- Enter the deposit and nominal annual interest rate.
- Enter the term in years and compounding frequency.
- Read maturity balance, interest and effective annual yield.
Examples
- 1,000 at 10% compounded yearly for 2 years matures at 1,210.
- 12% nominal compounded twice yearly gives 12.36% annual yield.
Frequently asked questions
Should I enter APY as the rate?
No. Enter the nominal annual rate; the tool calculates effective annual yield separately.
What if I withdraw interest?
The estimate assumes all interest remains deposited; withdrawals reduce the final amount.
Will this match my bank exactly?
Not always. Day counts, fractional-period rules, fees and early-withdrawal penalties can differ.
Sources
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