💰 Finance
Compound Interest Calculator
See exactly how your investment grows over time with compound interest. Year-by-year chart included.
Final Amount
£22,196
Total Interest
£12,196
Total Invested
£10,000
Return Multiple
2.22×
Principal
Interest Earned
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Compound interest formula
A = P × (1 + r/n)^(n×t)
- A = Final amount
- P = Principal (starting amount)
- r = Annual interest rate (decimal)
- n = Compounding frequency per year
- t = Time in years
Why compound interest is so powerful
With compound interest, you earn interest on your interest. £10,000 at 8% for 30 years grows to over £100,000 — without adding a single extra pound. Einstein reportedly called it "the eighth wonder of the world."
Compounding frequency comparison
For a 10,000 investment at 10% for 10 years: annual compounding = 25,937 / monthly = 27,070 / daily = 27,179. The difference between monthly and daily is small; what matters most is the rate and duration.