See how your savings or investments grow with compound interest. Enter your principal, rate, time and compounding frequency to get the full picture.
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Interest Earned
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Final Balance
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Total Contributions
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The Rule of 72: Divide 72 by your annual interest rate to estimate how many years it takes to double your money. At 6%: 72/6 = 12 years. At 9%: 72/9 = 8 years.
FAQs
Compound interest is interest calculated on both the initial principal AND the accumulated interest. Unlike simple interest (only on principal), compound interest grows exponentially over time — making it powerful for long-term investing.
More frequent compounding means slightly higher returns. Daily > monthly > quarterly > annually. However, the difference is small. A 5% rate compounded daily vs annually on £10,000 over 10 years differs by only ~£130.
To find the real return, subtract the inflation rate from your interest rate. If you earn 5% but inflation is 3%, your real return is approximately 2%. Use this “real rate” in the calculator to see inflation-adjusted growth.
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