Compound Interest Calculator
See how your savings or investment grows with compound interest — choose the rate, years and compounding frequency.
- Runs privately in your browser
- Free, no sign-up
- Updated
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How to use the Compound Interest Calculator
- Enter your starting amount.
- Enter the yearly interest rate and the number of years.
- Choose how often interest is added. Results update instantly.
Compound interest formula
A = P × (1 + r/n)n×t, where P is the starting amount, r the annual rate (as a decimal), n how many times per year interest is added, and t the number of years.
Example: 10,000 at 5% compounded monthly for 10 years grows to about 16,470 — that's 6,470 of interest, compared with 5,000 from simple interest.
Why compounding frequency matters
The more often interest is added, the sooner it starts earning interest of its own. The difference between monthly and daily compounding is small; the difference between simple and compound interest over many years is large.
Frequently asked questions
Does this include regular monthly deposits?
No, this calculator shows growth of a single starting amount. Results are estimates and ignore taxes and fees.
Which currency does it use?
Any — the maths is the same for every currency.
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