Compound Interest Calculator

See how savings grow with compound interest and regular deposits.

Result

Total deposited£53,000.00
Interest earned£42,769.94
Final balance£95,769.94

Compound Interest Calculator — FAQs

What is compound interest?

Interest earned on interest — growth accelerates each period. £5,000 at 5% for 20 years ≈ £13,533 with no deposits.

Compound interest formula?

FV = P(1 + r/n)^(nt). With monthly deposits add the future-value-of-annuity term — the calculator handles both.

What is the rule of 72?

72 ÷ rate ≈ years to double. At 6%, money doubles roughly every 12 years.

Monthly vs annual compounding?

More frequent compounding earns slightly more — 5% annual compounded monthly ≈ 5.116% effective.

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Free to use — paste this snippet into any webpage. It auto-resizes and includes a small attribution link. Add ?theme=dark to the iframe URL for dark mode.