Calculated from the sample figures using the displayed formula.
What is the operating margin formula?
Operating income ÷ RevenueOperating margin expresses operating income as a percentage of revenue.
What do the inputs mean?
- Operating income
- The value entered for operating income. Keep its period and units consistent with the other inputs.
- Revenue
- The value entered for revenue. Keep its period and units consistent with the other inputs.
How to calculate it step by step
- Define the decision.
Write down what the result will help you compare or decide. - Collect matching inputs.
Use figures from the same period and apply the definitions shown on this page. - Apply the formula.
Operating income ÷ Revenue. - Check the units.
Confirm whether the result is a currency amount, percentage, number of periods or ratio. - Test a second case.
Change one assumption at a time to see what drives the result.
Worked example
Using the sample figures in the calculator, the result is 18.57%. Change one figure at a time and recalculate to see which assumption has the greatest effect. A spreadsheet should return the same result when it uses the same formula, units and timing.
When should you use operating margin formula?
Use it to examine operating performance before interest and income-tax effects.
Limitations and common mistakes
Confirm how operating income and exceptional items are classified.
Do not mix annual figures with monthly figures, ending balances with averages, or percentages with whole numbers. Record the definition used so another person can reproduce the result.
Frequently asked questions
What is operating margin formula?
Operating margin expresses operating income as a percentage of revenue.
How should I use operating margin formula?
Use the formula only after matching every input to the same period, unit and definition. Then compare the result with a worked example and the decision you are trying to make.
What is the most common mistake with operating margin formula?
Confirm how operating income and exceptional items are classified.
Can I calculate operating margin formula in a spreadsheet?
Yes. Reproduce the displayed equation with separate cells for each input, keep percentages as decimals, and test the spreadsheet against the worked example before replacing the sample figures.
Sources and methodology
This page uses the Beginners’ Guide to Financial Statements for the underlying financial or reporting context. Spreadsheet-related behavior is checked against Microsoft’s financial-function documentation. Examples are illustrative and use the formula displayed on the page.