How is compound interest calculated?

It applies the formula A = P(1 + r/n)^(nt), where the rate is split across each compounding period (annual, quarterly, monthly, or daily) so interest earns interest. Monthly contributions are grown as an ordinary annuity and added to the principal's future value.

Does the calculator include regular contributions?

Yes. Add an optional monthly contribution and it is compounded each month and included in the future value, total contributions, and interest earned figures.

📈

Compound Interest Calculator

See how your savings grow over time.

Loading tool…

How to use the Compound Interest Calculator

1Enter your principal, annual interest rate, and number of years.
2Pick a compounding frequency and add an optional monthly contribution.
3Read your future value, total contributions, and total interest earned instantly.

About the Compound Interest Calculator

Free compound interest calculator: enter principal, annual rate, years, compounding frequency, and monthly contributions to find future value, total deposits, and interest earned.

Part of our Calculators collection. Browse all tools.

Frequently asked questions

How is compound interest calculated?: It applies the formula A = P(1 + r/n)^(nt), where the rate is split across each compounding period (annual, quarterly, monthly, or daily) so interest earns interest. Monthly contributions are grown as an ordinary annuity and added to the principal's future value.
Does the calculator include regular contributions?: Yes. Add an optional monthly contribution and it is compounded each month and included in the future value, total contributions, and interest earned figures.