How it works

Interest is added to the balance each compounding period. Contributions are assumed at the end of each period and are not increased for the first period.

Standard formulaA = P(1 + r/n)ⁿᵗ + PMT × (((1 + r/n)ⁿᵗ − 1) / (r/n))

Worked example

Enter a starting balance, annual rate, years, and monthly contribution to compare growth with and without regular deposits.

Frequently Asked Questions

What does compounding frequency mean?

It is the number of times interest is added to the balance each year.

When are contributions added?

This model adds each contribution at the end of its period.

What happens at zero interest?

The final balance is the starting amount plus all contributions.

Is this an investment guarantee?

No. It is a mathematical estimate and actual returns can vary.