Free calculator
Monthly Roi Calculator
Free Monthly Roi Calculator with instant browser-based results and a clear calculation breakdown.
Monthly ROI Calculator
Enter what you invested, any amount added at the end of each month, the ending value, and the number of months. The tool finds the compound monthly return that links them.
Added at each month's end; 0 if none
Compound monthly ROI
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| Total amount invested | |
| Net profit / loss | |
| Total ROI | |
| Simple average monthly ROI | |
| Equivalent annualized rate |
How it works: Total invested = initial + contribution × months. Total ROI = (ending value − total invested) ÷ total invested. Simple monthly ROI = total ROI ÷ months. Compound monthly ROI is the rate r that satisfies Ending = Initial×(1+r)^n + Contribution×((1+r)^n − 1)/r, solved numerically. Annualized = (1+r)^12 − 1. This describes past or hypothetical figures only and does not predict or guarantee future results.
Want to understand the calculation?
Read the guideSee examples, formula notes and limitations.