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Compound Interest Calculator

See how your money grows over time with compounding and optional regular contributions.

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Contributions Interest

The power of compound interest

Compound interest is interest earned on both your original principal and the interest already accumulated. The formula is A = P(1 + r/n)^(nt), where P is the principal, r the annual rate, n the number of times interest compounds per year, and t the number of years. Over long periods, compounding can dramatically increase your balance.

For monthly investing instead of a lump sum, use the SIP calculator. To plan loan repayments, try the EMI calculator.

Frequently asked questions

What is compound interest?

It is interest calculated on the initial principal and also on the accumulated interest from previous periods.

How is compound interest calculated?

Using A = P(1 + r/n)^(nt), where P is principal, r the annual rate, n the compounding frequency and t the time in years.

What does compounding frequency mean?

How often interest is added — for example monthly, quarterly or yearly. More frequent compounding yields slightly higher returns.

Can I add regular contributions?

Yes, if you invest a fixed amount each month, use the SIP calculator for future-value projections.

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