Find how much your savings grow over time with compound interest, including monthly deposits and the compounding frequency.
Enter your data
The recurring deposit is added each compounding period (monthly, quarterly or yearly).
Compound interest means interest on interest: earnings are reinvested and grow exponentially over time.
Future value = 31,998.32 £How the balance builds each year: cumulative money in (initial amount + deposits) and the interest accrued on top.
| Year | Total in | Interest to date | End balance |
|---|---|---|---|
| 1 | 11,200 £ | 539.5 £ | 11,739.5 £ |
| 2 | 12,400 £ | 1,168.01 £ | 13,568.01 £ |
| 3 | 13,600 £ | 1,890.06 £ | 15,490.06 £ |
| 4 | 14,800 £ | 2,710.44 £ | 17,510.44 £ |
| 5 | 16,000 £ | 3,634.2 £ | 19,634.2 £ |
| 6 | 17,200 £ | 4,666.6 £ | 21,866.6 £ |
| 7 | 18,400 £ | 5,813.23 £ | 24,213.23 £ |
| 8 | 19,600 £ | 7,079.91 £ | 26,679.91 £ |
| 9 | 20,800 £ | 8,472.79 £ | 29,272.79 £ |
| 10 | 22,000 £ | 9,998.32 £ | 31,998.32 £ |
Standard financial formulas (time value of money). Instant in-browser calculation, no account, no data sent. Rates are indicative — check the provider’s actual offer. Last updated: 11 July 2026 · Bank of England base rate.
⚖︎ Results are for informational purposes and do not constitute tax advice. For specific situations, consult a licensed accountant or the relevant tax authority.
Compound interest adds the gain to the capital, and the new total itself earns interest. Future value is calculated as:
At £10,000, 5% a year, compounded monthly, over 10 years, the final value is ≈ £16,470 — over £6,400 in interest.
It is interest calculated not only on the initial amount but also on previously accumulated interest. Money grows exponentially, because each gain itself earns interest.
Future value = initial amount × (1 + r/n)^(n×years), where r is the annual rate and n the number of compoundings per year. Periodic deposits add their future value on top.
With simple interest you earn only on the initial amount. With compound interest, interest is added to the capital and earns further interest, so over the long run the gap grows large.
It is how often interest is added to the capital: yearly, quarterly or monthly. The more frequent the compounding, the slightly higher the final value at the same annual rate.
Each deposit is added to the capital and begins earning interest. Regular deposits, even £50 or £200 a month, significantly raise the final value thanks to compounding.
A quick approximation: divide 72 by the annual rate to find how many years it takes to double your money. At 6% a year, money doubles in about 72 ÷ 6 = 12 years.
Yes. On loans and credit cards, compounding works against you: unpaid interest is added to the balance. That is why repaying debt quickly greatly reduces the total cost.
No. The calculator shows the nominal value. For real purchasing power, subtract inflation; for the net figure, remember that in the UK savings interest above your Personal Savings Allowance (£1,000 for basic-rate taxpayers, £500 for higher-rate) is taxed by HMRC.
Because the compounding effect accelerates over time. Starting 10 years earlier can be worth more than doubling the amount invested later.
Each row is one year: the total money you have put in by then (initial amount plus deposits), the interest earned to date, and the end-of-year balance. The bars split every year into contributions and interest, so you can see the point where interest starts to outgrow your own deposits — the hallmark of compounding.