Operating Expense Ratio Calculator
Enter operating expenses and revenue to get the operating expense ratio.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
The operating expense ratio (OER) divides operating expenses by revenue: OER = Operating Expenses ÷ Revenue. It shows what share of every dollar earned gets consumed just running the business — rent, salaries, utilities, marketing — before financing costs, taxes, or one-off items are considered, so a lower ratio means more revenue survives to become operating profit.
In commercial real estate, the same formula (usually operating expenses ÷ gross operating income, excluding mortgage payments and depreciation) is a standard way to judge how efficiently a rental property is being managed. Business owners track OER over time to catch cost creep early, and investors use it to compare operating discipline across companies of very different sizes.
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