◨ FINANCE Updated July 25, 2026

Compound Interest Calculator

See how your savings compound over time.

Initial amount
Monthly contribution
Annual rate (%)
Years
Compounding
0Future value
—Total paid in
—Interest earned
—Growth
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How it works

The balance grows by A = P(1 + r/n)^(nt), where r is the annual rate, n the number of compounding periods a year, and t the number of years. Monthly contributions are added at the end of each month and compound for the remaining term.

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Frequently asked questions

How often should interest compound?

More frequent compounding earns slightly more. Most savings accounts compound monthly or daily, while bonds and some funds compound annually.

Does this account for inflation or tax?

No. The figures are nominal returns before tax and inflation. Subtract your expected inflation rate from the interest rate for a rough real-terms view.

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