UK · Free calculator
Compound interest calculator
Project how savings grow with compound interest and regular monthly contributions.
Your figures
Rates updated 2026-04-06. Results update as you type.
- Final balance
- £38,074.58
- Total contributed
- £29,000.00
- Interest earned
- £9,074.58
Balance over time
How this calculator works
Interest compounds monthly; contributions are added each month.
£5,000 + £200/month
Starting with £5,000, adding £200 monthly at 4.5% for 10 years.
Assumptions & sources
- Interest compounded monthly.
- Rate stays constant; no fees or tax.
- Standard compound interest with regular contributions
Frequently asked questions
No. Returns are illustrative before tax. Cash ISAs and stocks & shares wrappers can change the after-tax result.
Estimates only
Handy Money Tools provides illustrative figures, not personalised financial or tax advice. Verify
important decisions with official sources or a qualified adviser.
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