Methodology, examples, and practical guidance
ROI Calculator: Return on Investment Percentage
Simple return on investment compares the net gain from an investment with its initial cost. It is useful for summarizing an outcome, but it does not describe when returns arrived or how uncertain they were.
THE METHOD
The formula
Use the following method with your own business figures.
Investment cost must be greater than zero. Total value returned should include the original capital recovered, not just the net gain.
PUT IT TO WORK
A worked example
These figures illustrate the calculation, not a recommended business target.
- $7,250 total value returned − $5,000 invested = $2,250 net gain.
- $2,250 ÷ $5,000 × 100 = 45% ROI.
The example investment returned 45% over the measured period. This is not an annualized return.
USE THE RESULT
How to interpret the number
Put the result in context
Compare results over similar time horizons and on consistent cost definitions. If operating expenses or fees are missing, the percentage may overstate the economic gain.
CHECK YOUR ASSUMPTIONS
Common mistakes
Check the inputs and assumptions
Do not enter only the profit in the value-returned field, because the formula subtracts investment cost again. A displayed zero with zero investment does not represent a defined ROI.
Questions business owners ask
Use these answers to refine the assumptions behind the calculator—not as a substitute for advice specific to your business.
Does this account for risk or compounding?
No. This is a simple total-period calculation. It does not annualize returns, discount future cash flows, or adjust for risk.
Planning note: Use this educational estimate alongside your records and qualified professional advice for significant business decisions.