Compound Interest Calculator

See how much you build up by saving regularly over the years — including the effect of compound interest.

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£
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Final balance
Total contributed
Interest earned

Where to keep your savings

Compare interest rates on savings accounts.

Results are estimates and are not advice or an offer. They assume a constant rate and monthly compounding.

Frequently asked questions

What is compound interest?

Interest earned not only on your contributions but also on previously earned interest. This makes savings grow faster over time.

Is my data sent anywhere?

No — everything runs in your browser.