Compound Interest Calculator
No recurring deposits included.
Future value = principal × (1 + rate ÷ periods)^(periods × years)
Estimate future value under a constant interest rate and regular compounding.
Formula
Future value = principal × (1 + rate ÷ periods)^(periods × years)
Worked example
Starting principal: 1000
Annual rate: 5 %
Years: 10
Compounding periods per year: 12
With these inputs, the result is **1,647.0095 **. No recurring deposits included.
How to use this calculator
- Identify the quantity you want to calculate.
- Enter your measurements in the units shown on each field.
- Read the result, which updates as you change the inputs.
- Check the assumptions below before applying the result.
Assumptions and limits
Compounding periods must be a whole positive number. No investment return is guaranteed; fees and taxes are excluded.
Precision and checking
Results are rounded for display. Use the most accurate measurements available, and avoid rounding your inputs unnecessarily. Extra decimal places in a result do not make an estimate more reliable.
To check a result, substitute the same input values into the formula shown above. Change one value at a time to understand how the quantity responds.
Frequently asked questions
What assumptions does this calculation use?
Compounding periods must be a whole positive number. No investment return is guaranteed; fees and taxes are excluded.
Are my inputs sent to a server?
No. The calculation runs locally in your browser. The result updates as you edit the inputs.
Sources & references
- Compound Interest Calculator — U.S. Securities and Exchange Commission
