Compound interest calculator
Estimate final value from starting amount, monthly contribution, term, annual rate, and compounding frequency.
When to use this calculator
Estimate future value and compound growth from an initial amount, monthly contribution, term, rate, and compounding frequency.
- Comparing long-term saving scenarios
- Estimating the effect of regular contributions
- Understanding how time and rate affect compound growth
Worked examples
Regular contributions
Contributions are assumed at the end of each month and grow for the remaining term.
Compounding frequency
More frequent compounding can slightly increase future value at the same nominal annual rate.
Zero rate
At 0%, the result is simply the initial amount plus all contributions.
Frequently asked questions
Is the projected return guaranteed?
No. The calculation assumes a constant rate and does not model market losses.
Are contributions made at the start or end of the month?
The calculator treats them as end-of-month contributions.
Are taxes and fees included?
No. Subtract applicable taxes, fees, and inflation separately.
How to interpret the result
Use several rate scenarios instead of treating one projection as a forecast.
Investment products can lose principal and actual returns vary over time.