Compound Interest Calculator

Project how a lump sum plus regular contributions grows with compound interest. Set your starting amount, contributions, rate, and compounding schedule to see the yearly balance and interest earned. Everything runs in your browser - nothing is sent to any server.

Starting amount

Contribution amount

Contribution frequency

Annual interest rate (%)

Compounding frequency

Number of years

Add contributions at the start of each period

Final balance $0.00

Total contributions $0.00

Interest earned $0.00

Interest share

Contributions Interest

Year by Year

Year	Balance	Total contributions	Interest that year	Total interest