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Compound Interest Calculator

Calculate compound interest and the final amount for any compounding frequency.

Last updated: 8 Aug 2026

Quick answer

Compound interest is calculated as A = P(1 + r/n)^(n×t), where n is how often interest compounds per year. For example, ₹1,00,000 at 10% compounded annually for 5 years becomes ₹1,61,051 (₹61,051 interest). Enter your figures above to calculate instantly.

₹
% p.a.
years

Compound interest earns "interest on interest", so your money grows faster than with simple interest. This calculator uses A = P(1 + r/n)^(n·t) and lets you choose how often interest compounds — annually, half-yearly, quarterly or monthly.

How to calculate compound interest

  1. 1 Enter the principal amount.
  2. 2 Enter the annual interest rate and tenure in years.
  3. 3 Choose how often interest compounds.
  4. 4 See the final amount and the compound interest earned.

Frequently asked questions

What is the compound interest formula?
A = P(1 + r/n)^(n·t), where P is principal, r the annual rate (as a decimal), n the compounding frequency per year, and t the years. Compound interest = A − P.
How is it different from simple interest?
Simple interest is charged only on the principal, while compound interest is charged on the principal plus previously earned interest — so it grows faster.
Does more frequent compounding earn more?
Yes — for the same rate, more frequent compounding (e.g. monthly vs annually) yields a slightly higher final amount.

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