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Free Online Compound Interest Calculator

Calculate how your investment grows with compound interest over time. Enter the principal amount, annual interest rate, time period, and compounding frequency (annually, semi-annually, quarterly, monthly, or daily) to see the maturity amount and total interest earned. The calculator demonstrates the power of compounding — how earning interest on interest accelerates wealth growth compared to simple interest.

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8%
10 yrs

Invested amount

1,00,000

Est. interest

1,21,964

Future value

2,21,964

Frequently Asked Questions

A = P(1 + r/n)^(nt), where A is the maturity amount, P is the principal, r is the annual interest rate (as decimal), n is the number of times interest is compounded per year, and t is the time in years.