How to use this calculator
Enter a starting balance, nominal annual rate, duration in years and compounding frequency. The result separates your principal from projected interest.
The math behind it
Final balance = principal × (1 + annual rate ÷ 100 ÷ periods per year)^(periods per year × years) Interest = final balance − principal
A worked example
1,000 at a nominal annual rate of 5%, compounded monthly for 10 years, grows to about 1,647.01, including 647.01 interest.
Assumptions & precision
Fixed nonnegative nominal rate. No additional contributions, withdrawals, taxes, fees, inflation or investment risk. Daily means 365 periods per year. Fractional years use fractional exponents, a mathematical interpolation that may differ from actual crediting dates. This is not an APY input or guaranteed investment return. Currency changes display only; no exchange-rate conversion. Money is rounded only for display using the currency’s fractional digits. Results above 10¹⁵ are rejected.
A common question
Is this the same as annual percentage yield?
No. This input is a nominal annual rate divided across compounding periods. APY already accounts for compounding and should not be entered as the nominal rate without conversion.