WorldCalcs

Compound Interest Calculator

See how your savings grow with compound interest, at any frequency.

Reviewed by the WorldCalcs team · Methodology · Last reviewed: June 2026

Final balance

16 470.09

Total interest earned

6 470.09

Works for any currency — results are in whatever currency you enter.

What is compound interest?

Compound interest is interest earned on both your original principal and the interest already added to it. A compound interest calculator shows how a lump sum grows over time at a chosen rate and compounding frequency.

How it's calculated

A = P × (1 + r/n)^(n × t), where P is the principal, r is the annual rate as a decimal (rate ÷ 100), n is how many times interest compounds per year, and t is the number of years. Interest earned = A − P. More frequent compounding (monthly or daily) yields slightly more than annual compounding.

Example

10 000 at 5% compounded monthly for 10 years grows to 16 470.09 — that is 6 470.09 in interest. Compounded once a year instead, it would reach about 16 288.95.

All calculations happen in your browser. Nothing is sent, stored, or tracked.

Results are estimates and may contain errors — for general information only, not professional advice. Always verify before relying on them. Disclaimer

How to use

Enter your starting principal, annual interest rate, how often interest compounds, and the number of years. Results update instantly as you type.

The final balance is what your account is worth at the end. Interest earned is the part of that balance that came from interest, not your original deposit.

Frequently asked questions

What is compound interest?+

Interest that is added to your balance so that future interest is earned on a larger amount — interest on interest.

How does compounding frequency affect growth?+

The more often interest is added (yearly to daily), the more you earn, though the difference is usually small.

What is the difference between compound and simple interest?+

Simple interest is paid only on the original principal; compound interest is paid on principal plus accumulated interest, so it grows faster.

Does this include regular deposits?+

No — it grows a single lump sum. Use the savings calculator if you add money each month.

What is the rule of 72?+

A quick estimate of how long money takes to double: divide 72 by the interest rate (e.g. about 14 years at 5%).

Does it work for any currency?+

Yes — figures are in whatever currency you enter.

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