Compound interest calculator
See how much your money can grow with interest on interest, adding a starting amount and a deposit every month. Works with any currency.
Enter a term and a starting amount or monthly deposit greater than zero.
This is an estimate for information only. It is not a credit offer or an investment recommendation: check the terms with the institution before you decide.
How we calculate
Each month’s interest is added to the balance and starts earning interest too. The monthly deposit goes in at the end of each month.
i = monthly rate as a decimal · n = months. A yearly rate becomes the equivalent monthly rate: i = (1 + yearly rate)1/12 − 1. Taxes and fees are not deducted.
Frequently asked questions
Is this return guaranteed?
No. It is a projection with a fixed rate. In real life the rate can change, and taxes and fees lower the result.
Which rate should I use?
Use the rate of the investment you are looking at, per month or per year.
Can I leave the monthly deposit out?
Yes. Set the deposit to 0 to see only how the starting amount grows.