Compound interest calculator v1.0

Enter a starting amount, a rate and a period to see what compounding does to it, year by year. Monthly contributions are supported.
Everything is calculated on your own device — nothing is sent anywhere (it works offline too).

1. Your figures

Any currency — the arithmetic is the same

Compounded monthly (an annual rate is converted to its monthly equivalent)

Leave at 0 for a lump sum

2. Result

Compounding assumes every gain is reinvested and that the rate repeats. Real returns are not constant: there are losing periods, and costs and taxes are not included here. This is arithmetic, not a forecast.

3. Year by year

Year Balance Multiple Total paid in Gain