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Compound Interest Calculator

See how your savings grow with compound interest. Enter a starting amount, annual rate, years and monthly contributions.

How it works

Compound interest means you earn interest on your interest. Over time, growth accelerates. This calculator assumes monthly compounding: FV = P(1+r)n + A × ((1+r)n − 1) / r, where r is the monthly rate, n the number of months and A your monthly contribution.

Starting early and contributing consistently matters more than finding the perfect return. Remember to consider inflation and taxes when estimating your real returns.

For information only — not financial advice. Actual returns vary and are not guaranteed.

Frequently Asked Questions

What is the difference between simple and compound interest?

Simple interest is paid only on the principal. Compound interest is also paid on previously earned interest, so growth accelerates.

How much do monthly contributions matter?

A lot over long periods — regular contributions benefit from compounding and often make up most of the final balance.

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