Compound interest calculator UK
Project a lump sum using a fixed effective annual return. See the future balance and growth separately, before tax, fees and inflation.
Enter your figures
Projected future value
Inputs changed. Select Calculate result to update your estimate.
Illustrative constant effective annual return. No additional payments, tax, fees or inflation. Returns are editable assumptions, not a forecast.
How the compound interest calculator uk works
Future value = starting amount × (1 + annual rate ÷ 100)^years.
Data basis: mathematical formula using your inputs. Example prices and rates are illustrative, not current market quotes.
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Worked example: lump-sum compound interest
This illustration uses the calculator’s example inputs. It is not a quote or a recommended financial decision.
- Starting amount (£)
- 10,000
- Annual effective return (%)
- 4
- Years
- 10
Projected future value: £14,802.44
Future value = starting amount × (1 + annual rate ÷ 100)^years.
Lump-sum compound interest: questions answered
Does this compound interest calculator include monthly deposits?
No. It models growth on one lump sum. Use the savings calculator for regular end-of-month contributions, or the savings goal calculator to solve for a target contribution.
Using your result
Example inputs are a starting point. Replace them with your figures and select Calculate result. Results are rounded for display; calculations use unrounded values.
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