Compound Interest Calculator

Estimate future investment value with compound growth and regular monthly contributions.

Inputs

Enter values on the left and select Equals to see the result here.

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Projects a future balance from an initial investment plus monthly contributions.
Shows total contributions and estimated interest earned.

Select currency and enter your starting investment.
Enter monthly contribution, annual interest rate, years, and compounding frequency.
Click Calculate to see final balance and breakdown.

Applies compound growth to the initial principal using the selected compounding frequency.
Adds recurring monthly contributions with a monthly-growth approximation for realism and simplicity.

Start £5,000, add £200/month, 6% for 10 years.

Result: Outputs show final balance, total contributions, and interest earned.

Is this guaranteed?

No. It’s an estimate based on constant returns. Real returns vary over time.