Compound Interest Calculator
Explore how a starting balance and regular savings could grow.
Processed on your deviceFree · No account needed
How to use it
- Set a starting balance, monthly contribution, effective annual rate and duration.
- Choose whether contributions arrive at the start or end of each month.
- Review the projected balance, contributions and annual table.
1,000 with 10% effective annual growth and no deposits becomes 1,100 after one year.
Details & limits
Up to 100 years with monthly contributions. Effective annual rate converted to a monthly rate. No taxes, fees or inflation.
What assumptions does the projection make?
The monthly rate is (1 + annual rate ÷ 100)^(1/12) − 1. Contributions happen every month, consistently at its beginning or end. All amounts use your chosen unit or currency consistently; no exchange conversion occurs. Rates are constant; taxes, fees and inflation are excluded. This is a hypothetical projection, not a guaranteed return or personal financial advice.