Compound Interest Calculator
Project how savings or investments may grow over time with compounding and recurring monthly contributions. The calculator separates ending balance into contributions and estimated growth.
Estimated ending balance$300,850.72
Total contributed$130,000.00
Estimated growth$170,850.72
How this tool works
Monthly balance update = prior balance × (1 + annual rate ÷ 12) + monthly contribution.
Example
Starting with $10,000, adding $500 monthly and earning an assumed 7% annual return compounds both the original balance and prior gains.
Common questions
Is the return guaranteed?
No. The rate is an assumption for planning and does not represent guaranteed investment performance.
Are taxes included?
No. Taxes, fees and inflation are excluded.