Interest Calculator
Calculate simple or compound interest, choose how often interest is added, include a monthly addition, and see the balance grow year by year. Download the table as CSV.
%
Up to 100 years.
Optional. Added at the end of every month.
Enter an amount, a yearly rate, and a time to see the balance.
On this device
No signup. Your input is never uploaded.
How to use the Interest Calculator
Choose Compound or Simple.
Enter the Starting amount, the yearly rate, and the time.
For compound interest, choose how often interest is added, and add a Monthly addition if you like.
Read the final balance and the year-by-year table.
Questions about the Interest Calculator
Simple interest is earned only on the starting amount. Compound interest is also earned on the interest already added, so the balance grows faster the longer it runs.
The more often interest is added, the slightly more you earn. Choose yearly, half-yearly, quarterly, monthly, or daily to see the difference.
Yes. Enter a Monthly addition and it is added at the end of every month. The table shows your balance year by year, and you can download it as CSV.