ROI Calculator
Calculate return on investment as a percentage.
System verdict
RESULTROI %: 50
The saving is the percentage of the original price; the final price is what remains.
Diagnostic telemetry
- ROI %
- 50
- Net return
- 500
What this cannot tell you
- Pure arithmetic. It does not account for time — a 50% return over one year and over ten years are very different, and ROI alone does not distinguish them.
How this calculation works
ROI is the net gain divided by the amount invested. Enter what you got back and what you put in.
What the results mean
- ROI %
- Net return as a share of the investment. 50% means you made half your investment back on top of it.
- Time not included
- ROI ignores how long the investment took. Compare two investments only if their time frames match, or use an annualised figure.
Frequently asked questions
Is a higher ROI always better?
Not without knowing the time frame and risk. A 50% ROI over one month beats 50% over ten years, and a high ROI on a risky bet is not comparable to a modest one on a safe one. ROI is a useful headline figure but always read it alongside how long it took.