Free calculator · no account needed

Compound interest calculator

Project a balance with monthly compounding and no new contributions.

Illustrative result

£1,051.16 after 1 years

Growth is an assumption compounded monthly from the annual rate you enter. It is not a forecast and it is not guaranteed.
The worked example is £1,000 at 5% for one year. Each month is rounded half-up.

Why is this not exactly 5% more?

Monthly compounding with penny rounding finishes at £1,051.16 in the example, not £1,050.

The result stays in your browser. Create an Aldoraun account if you want to keep a budget, accounts and a cashflow forecast.

Estimates only. Tax and repayment rules can change, and this is not financial, tax or pension advice.