What is the compound interest formula?

A = P × (1 + r/n)^(n×t), where r is the yearly rate, n is compounding times per year and t is years.

Does monthly compounding earn more?

Yes, slightly. More frequent compounding adds interest to interest sooner.

What is the rule of 72?

Divide 72 by the interest rate to estimate years to double. At 12% money doubles in about 6 years.

Can I add monthly savings?

Yes. Enter a monthly amount to see SIP-style growth.

Are returns guaranteed?

Only for fixed products like FDs. Market returns vary.

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Compound Interest Calculator— Grow money with compounding and monthly additions.

Starting amount (₹)

Monthly addition (optional) (₹)

Interest rate per year (%)

Years

Total invested

₹1,00,000

Interest earned

₹2,30,039

Final value

₹3,30,039

Invested (30%)
Interest (70%)

Rule of 72: money doubles in about 6.0 years at 12%.

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How to Use the Compound Interest Calculator

Enter your starting amount, yearly interest rate and number of years. Pick how often interest compounds and optionally add a monthly investment. The final value, total invested and interest earned appear instantly with a chart.

Frequently Asked Questions

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