Compound interest calculator

See how savings or investments grow over time with compound interest and regular contributions.

—Final balance
—Total contributed
—Interest earned

Results are estimates for planning only and are not financial advice. Check exact figures with your lender or provider.

Show year-by-year growth

Questions

What is compound interest?

It is interest earned on both your original money and the interest already added. Over time, growth speeds up because each period's interest earns interest too.

How do monthly contributions affect the result?

Each contribution is added at the end of the month and then grows with the rest of the balance. Regular contributions often matter more than the starting amount.

What does compounding frequency mean?

It is how often interest is added to the balance. More frequent compounding, such as monthly or daily, gives a slightly higher final amount at the same annual rate.

Does this account for taxes or inflation?

No. The figures are before taxes, fees and inflation, and assume the rate stays the same every year.

Is my information stored?

No. Everything is calculated in your browser.