Operating Expense Ratio Calculator

Background.

This operating expense ratio page is built to compare property operating expenses before debt service with effective gross income. The operating expense ratio shows how much collected property income is consumed by operations before financing and capital items. The implemented convention is “operating expense ratio = property operating expenses before debt service / effective gross income.”

The editable entries are property operating expenses before debt service, effective gross income. Use values from the document or measurement that governs this operating expense ratio question; the defaults are only the worked fixture below. Do not put mortgage payments, income tax, depreciation or major capital replacements into the operating-expense numerator. If that operating expense ratio condition is not true, choose a calculation that models the missing convention.

Freddie Mac, Modeling Multifamily Potential Rental Income; current rent roll, concessions and vacancy treatment documents the convention or governing rule used here. The operating expense ratio output is a transparent scenario under those facts: it does not manufacture an unentered market price, professional determination, carrier quote, legal eligibility finding or locally adopted code value.

What is operating expense ratio calculator?

Operating Expense Ratio is the relationship behind this decision: the operating expense ratio shows how much collected property income is consumed by operations before financing and capital items. On this page it means operating expense ratio = property operating expenses before debt service / effective gross income. Do not put mortgage payments, income tax, depreciation or major capital replacements into the operating-expense numerator; that is the line between the reported quantity and a broader real estate analysis.

How to use this calculator.

1. 01Confirm that “operating expense ratio = property operating expenses before debt service / effective gross income” matches the operating expense ratio convention you need.
2. 02Replace the fixture values for property operating expenses before debt service, effective gross income with dated values from the governing record.
3. 03Keep all currencies, measurement units and time periods on the same basis before calculating.
4. 04Read operating expense ratio together with this boundary: Do not put mortgage payments, income tax, depreciation or major capital replacements into the operating-expense numerator.

The formula.

The calculation uses operating expense ratio = property operating expenses before debt service / effective gross income. In this operating expense ratio model, the entered terms are property operating expenses before debt service, effective gross income. The operating expense ratio shows how much collected property income is consumed by operations before financing and capital items, which is why the relationship is presented under this name rather than as a universal alternative. Do not put mortgage payments, income tax, depreciation or major capital replacements into the operating-expense numerator. Calculations keep full decimal precision through the relationship and round only the returned display values.

A worked example.

Frequently asked questions.

References& sources.

1. [1]Freddie Mac, Modeling Multifamily Potential Rental Income; current rent roll, concessions and vacancy treatment. Retrieved 2026-08-07. access: open unless marked otherwise.
2. [2]U.S. Internal Revenue Service. Publication 527, Residential Rental Property. Retrieved 2026-08-07. independence: primary; access: open.
3. [3]National Association of Realtors. Research and statistics. Retrieved 2026-08-07. independence: secondary-check; access: open.