Quick answer
Operating margin = operating income ÷ revenue × 100. $144,000 of operating income on $800,000 of revenue is an 18% margin.
Enter revenue and operating income. The calculator returns the margin.
Related tools: Contribution Margin Calculator: Per-unit contribution and contribution margin ratio. EBITDA Margin Calculator: EBITDA as a share of revenue. Net Profit Margin Calculator: Net profit as a share of revenue.
How to use the Operating Margin Calculator
- Enter revenue ($) (above 0).
- Enter operating income ($).
- Press Calculate to see the result, and use Reset to start again.
| Input | What to enter | Allowed values |
|---|---|---|
| Revenue | A number, in $ | > 0 |
| Operating income | A number, in $ | — |
Formula and method
Formula
margin = profit measure ÷ revenue × 100
IEEE-754 double precision; shown to the decimals indicated.
Use the same period and currency for both numbers.
Worked examples
This example is verified: each one is an automated test case that the live calculator must reproduce exactly.
Example 1
Inputs: Revenue = 800000; Operating income = 144000.
| Result | Value |
|---|---|
| Operating Margin | 18% |
| Profit as an amount | $144,000.00 |
The first line is the headline result (operating Margin). Below it the operating Margin Calculator lists profit as an amount, which describe the same case from other angles. IEEE-754 double precision; shown to the decimals indicated.
What is left out
Operating income is profit from core operations before interest and taxes. The 18% margin shows how much of each dollar of sales remains after the cost of goods and operating expenses such as wages and rent.
Reading it
Compare against rivals in the same industry and watch the trend. A rising operating margin with flat sales means costs are under control. A negative operating income gives a negative margin.
How the result changes with revenue
Holding every other input at the first worked example, this table changes only revenue. It shows how sensitive the answer is to that one value; each row was produced by running this calculator.
| Revenue | Operating Margin | Profit as an amount |
|---|---|---|
| 400000 | 36% | $144,000.00 |
| 800000 | 18% | $144,000.00 |
| 1600000 | 9% | $144,000.00 |
| 3200000 | 4.5% | $144,000.00 |
What happens with invalid input
These messages are produced by the calculator itself, so you know what to fix.
- Revenue: entering "0" shows "Revenue must be greater than 0." beside that field and no result.
- Operating income: left empty shows "Enter operating income." beside that field and no result.
Choosing between the Operating Margin Calculator and similar calculators
Each row shows what a related calculator on this site asks for and what it returns, so you can pick the one that matches your question.
| Calculator | You enter | It returns |
|---|---|---|
| [Contribution Margin Calculator](/business/contribution-margin-calculator/) | selling price per unit and variable cost per unit | Contribution per unit |
| [EBITDA Margin Calculator](/business/ebitda-margin-calculator/) | revenue and eBITDA | EBITDA Margin |
| [Net Profit Margin Calculator](/business/net-profit-margin-calculator/) | revenue and net profit | Net Profit Margin |
| [Margin Calculator](/business/margin-calculator/) | cost and revenue | Gross margin |
| [Revenue Calculator](/business/revenue/) | price per unit and units sold | Revenue |
Background: business metrics
Business ratios depend on exactly which costs and revenues you include, so read each page's definition. Two common checks: break-even units = fixed costs ÷ (price − variable cost per unit), so $50,000 of fixed costs with a $10 price and $5 variable cost breaks even at 10,000 units; and net profit margin = net profit ÷ revenue, so $20,000 profit on $100,000 revenue is 20%.
Return on investment ignores time: 20% over five years is far less impressive than 20% in one, so compare returns over the same period.
Assumptions and limitations
- Negative profit gives a negative margin
If a required value is empty, not a number, or outside its allowed range, the form marks that field with a message and shows no result instead of a misleading number. The automated checks deliberately try invalid entries for revenue and operating income to confirm this.
Frequently asked questions
How is it different from EBITDA margin?
EBITDA also adds back depreciation and amortisation.
Is operating margin the same as net margin?
No, net margin is after interest and tax.
What is a good operating margin?
It varies by sector; 10 to 20% is common for healthy firms.
What does the Operating Margin Calculator calculate?
Operating income as a share of revenue. It returns Operating Margin and Profit as an amount.
What formula does the Operating Margin Calculator use?
margin = profit measure ÷ revenue × 100. Use the same period and currency for both numbers.
What do I need to enter in the operating Margin Calculator?
You enter Revenue ($) and Operating income ($).
How is the result rounded or limited?
IEEE-754 double precision; shown to the decimals indicated. Negative profit gives a negative margin.
What is an example of a operating Margin result?
With revenue 800000 and operating income 144000, the operating Margin is 18%.
Related calculators
- Contribution Margin Calculator — Per-unit contribution and contribution margin ratio.
- EBITDA Margin Calculator — EBITDA as a share of revenue.
- Net Profit Margin Calculator — Net profit as a share of revenue.
- Margin Calculator — Profit, gross margin and markup from cost and revenue.
- Revenue Calculator — Revenue from price and units sold.
- Margin of Error Calculator — Margin of error for a mean or a proportion.
Sources
- OpenStax, Principles of Accounting, Volume 2: Managerial Accounting (Rice University)
Content last reviewed 2026-11-04. Formulas and worked examples are checked by automated tests against independently computed values.