Compound Interest Calculator — Free Online Tool

See exactly how your money grows — maturity amount, total interest earned, and a year-by-year breakdown, using the classic compound interest formula.

Maturityamount after – years

enter values above and press Calculate

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Total interest earned

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Principal invested

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Effective annual rate

A = P(1 + r/n)^nt
P = principal · r = annual rate (decimal) · n = compounds per year · t = years

Year	Balance	Interest so far

4 compounding frequencies

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How it works

1Enter the principal, annual interest rate and number of years.

2Choose how often interest compounds — yearly, half-yearly, quarterly or monthly.

3Press Calculate — get the maturity amount, total interest and yearly growth.

Frequently asked questions

What is the compound interest formula?

A = P(1 + r/n)^nt, where P is the principal, r the annual rate as a decimal, n the number of compounds per year, and t the years. For example: ₹10,000 at 8% compounded yearly for 2 years = 10,000 × 1.08² = ₹11,664.

How does compounding frequency change the result?

More frequent compounding earns slightly more, because interest starts earning interest sooner. ₹10,000 at 8% for 2 years grows to ₹11,664 yearly-compounded but about ₹11,729.16 monthly-compounded.

What is the effective annual rate?

It is the equivalent yearly rate when compounding is taken into account: (1 + r/n)ⁿ − 1. For 8% compounded monthly it is about 8.30% — useful for comparing offers with different frequencies.

A = P(1 + r/n)^nt · Year-wise table · Effective rate · 100% local — your numbers never leave this page.