Savings calculator UK
Estimate savings growth with a starting balance, monthly deposits and AER. See your contributions and compound interest separately, before tax and fees.
Enter your figures
Estimated future balance
Inputs changed. Select Calculate result to update your estimate.
A constant AER converted to a monthly equivalent. Contributions arrive at each month’s end. Excludes tax, fees and inflation. Example rates are illustrative.
How the savings calculator uk works
Monthly rate = (1 + AER ÷ 100)^(1/12) − 1. Each month: balance × (1 + monthly rate) + contribution.
Data basis: mathematical formula using your inputs. Example prices and rates are illustrative, not current market quotes.
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Worked example: savings growth
This illustration uses the calculator’s example inputs. It is not a quote or a recommended financial decision.
- Starting savings (£)
- 1,000
- Monthly contribution (£)
- 200
- Annual equivalent rate — AER (%)
- 4
- Saving period (years)
- 5
Estimated future balance: £14,452.46
Monthly rate = (1 + AER ÷ 100)^(1/12) − 1. Each month: balance × (1 + monthly rate) + contribution.
Savings growth: questions answered
Is AER the same as a monthly interest rate?
No. AER expresses annual growth including compounding. The calculator converts AER into an equivalent monthly rate and adds your contributions at each month’s end.
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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