Rental property

Operating Expense Ratio Calculator

Itemize recurring operating expenses and compare them with effective income and your expense-ratio target.

What this calculator estimates

Measure operating expenses as a share of effective rental income. It combines the inputs below to produce Operating expense ratio. Every assumption remains editable so the estimate can reflect the property, financing and location being evaluated.

Worked example

Using the displayed sample assumptions, the calculator produces 44.84%. This is an illustration, not a market quote. Change one input at a time to understand what drives the result.

Inputs and assumptions

• Annual gross potential rent — sample input: 60000 currency units
• Other annual income — optional — sample input: 0 currency units
• Vacancy and credit loss — sample input: 5 %
• Other annual operating expenses — sample input: 9000 currency units
• Annual property tax — sample input: 6000 currency units
• Annual insurance — sample input: 2000 currency units
• Annual owner-paid utilities — optional — sample input: 0 currency units
• Annual maintenance — sample input: 4000 currency units
• Management fee on effective income — sample input: 8 %
• Target operating expense ratio — sample input: 40 %

How to interpret the result

Review cash flow together with reserves, vacancy and financing risk. Compare a conservative case with an expected case and keep a record of the assumptions used.

Common mistake to avoid

Do not treat gross rent as net operating income. Local definitions, taxes, lending practices and measurement requirements can materially change the result.

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Reviewed 2026-09-08.