Household
Savings and compound interest calculator
See how a UK savings balance can grow with compound interest, a monthly contribution, and annual or monthly compounding.
Rates last checked on 9 November 2026.
Compared with the contribution above.
Balance at the end
£17,175.24
- You put in
- £13,000.00
- Interest earned
- £4,175.24
Gross of tax. Interest on savings can be taxable. This does not apply the personal savings allowance.
Show full breakdown
- Year 1£2,279.05
- Year 2£3,623.53
- Year 3£5,036.81
- Year 4£6,522.38
- Year 5£8,083.97
- Year 6£9,725.44
- Year 7£11,450.90
- Year 8£13,264.64
- Year 9£15,171.17
- Year 10£17,175.24
How this is worked out
Compound interest is interest on the balance and on interest already added. With monthly compounding, the balance earns one twelfth of the annual rate at the end of each month, and then your contribution is added. With annual compounding, the balance earns the full annual rate at the end of the year, and that year's contributions are added afterwards, so they do not earn interest until the next year.
The rate is the gross rate you type in. Nothing is taken off for tax. Interest on savings can be taxable above the personal savings allowance. Check the current allowance on GOV.UK, because it is not applied here.
Questions
Other calculators
For guidance only. This is not financial advice, legal advice, or a mortgage offer. Check the original invoice, contract, or lender illustration before you rely on a figure.
Email me savings updates
The balance stays in your browser. Leave an email for updates to the savings calculator. This does not start an invoice chase.
Joining the list does not start a payment.