P0 · Finance
Compound Interest Calculator
Estimate how an initial amount can grow with compound interest and constant monthly contributions. Your data is processed in your browser.
How to use
- Enter the initial amount and monthly contribution.
- Choose a monthly or effective annual rate and enter the percentage.
- Enter the number of months and calculate.
How it works
The balance earns the equivalent rate each month and then receives the contribution. An effective annual rate is converted to an equivalent monthly rate.
Notes and limitations
- This is a mathematical simulation with constant inputs.
- Taxes, fees, inflation, market changes, and contribution dates are excluded.
Frequently asked questions
Is the final amount guaranteed?
No. It only represents the scenario produced by the values you enter.