Unit Converter
ROI Calculator
Calculate net gain and return on investment percentage from gain and cost.
Formula and usage notes
ROI = (gain - cost) / cost x 100.
Calculate net gain and return on investment percentage from gain and cost.
Practical examples
13200 gain on 10000 cost gives 32% ROI.
Use the same time period when comparing ROI numbers.
Fees, taxes, and risk are not included in this simple ratio.
Frequently asked questions
What inputs does this calculator need?
Gain or ending value, Cost or starting value.
How should I round the result?
Keep extra digits while comparing values, then round for the final decision or report.
Can I reuse the result in another calculation?
Yes, but preserve the original inputs and units so the next calculation stays traceable.