Enter your starting amount, how much you add each month, the annual return you expect and the number of years. You will see the final balance, the total you paid in and the interest earned.
This is an estimate. Returns are not guaranteed, and the calculation does not deduct taxes, fees or inflation. Contributions are added at the end of each month.
How it is calculated
The annual return is converted into an equivalent monthly rate, and each month the balance grows at that rate and the contribution is added. For worked examples and to see why time matters so much, read our guide to compound interest. Go back to the tools page for more calculators.