Compound interest calculator

See how your savings and investments grow over time when you contribute regularly and let compounding do the heavy lifting.

What it could become

See how your savings and investments could grow if you keep going together.

In 20 years

£196,665

You put in

£82,000

Growth earned

£114,665

Starting amount£10,000
Added each month£300
Annual return7%
Years20

A guide only — real returns vary year to year. Assumes 7% average annual growth, compounded monthly.

Save toward this pot together?

We’ll save this as a goal in your free Evenly account — track it together.

Make compounding work for your household

The biggest lever in long-term saving isn’t the interest rate — it’s time and consistency. Small monthly contributions, left alone, grow into surprisingly large sums. Evenly helps couples free up that monthly amount by covering the bills fairly first.

How does compound interest work?

Compound interest means you earn returns on your returns, not just your original money. Over long periods this snowballs — which is why starting early and contributing regularly matters far more than picking the perfect rate.

What return should I assume?

For long-term stock-market investing, many people model around 5–7% a year after inflation, but returns are never guaranteed. This tool lets you try different rates to see the range of outcomes.