Benchmark your expense efficiency against market
For property managers and investors tracking what percentage of rental income goes toward operating expenses to measure cost efficiency.
Operating Expense Ratio Calculator
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Create Free AccountWhat it does
The Operating Expense Ratio Calculator divides total operating expenses by gross rental income to show what percentage of income goes to keeping the property running. Most properties stabilize between 30-50% OER; properties above 50% signal management issues or market challenges.
OER is your benchmark for property efficiency — the lower the ratio, the more NOI you produce per dollar of rent. By tracking OER trend over time, you spot deteriorating property conditions before cash flow crumbles and identify when major capital expenditures are required.
Who it's for
- Property managers tracking OER as a key performance indicator and optimizing controllable expenses
- Portfolio investors benchmarking OER across properties to identify underperformers and fixes
- Lenders using OER history to model forward and validate debt service coverage calculations
- Appraisers using comparable OER to value commercial properties using the income approach
How it works
Sum annual operating expenses
Taxes, insurance, maintenance, utilities, vacancy, management, HOA.
Input gross rental income
Annual revenue.
Divide
Operating expenses ÷ gross rent × 100 = expense ratio %.
Why it matters
Identify if your property runs lean or fat
Spot expense creep before it compounds
Negotiate better vendor rates with data
Compare across your own portfolio
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Enter a property address to pre-fill value, rent, and tax data automatically.
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Frequently asked questions
What's a good operating expense ratio?
Single-family: 25–40%. Multifamily: 35–50%. Class A buildings run lower; value-add run higher initially.
Should I include CapEx in this ratio?
No — CapEx is separate. But many investors reserve 5–10% of rent for CapEx, which raises the effective ratio.
Why do expense ratios vary so much?
Market differences (property taxes in NJ vs. TX), building age, tenant profile, and management efficiency all drive variance.
If my ratio is 60%, is the deal broken?
Not necessarily. If rents are rising or expenses are one-time, it may improve. But if structural, the deal's margin is thin.
Is this calculator free to use?
Yes — create a free Investor Starter account to run 1 calculator per day. No credit card required. Upgrade to Core ($49/mo) for unlimited access to all 67 calculators.
How accurate are the results?
Results are only as accurate as your inputs. The formulas use industry-standard real estate investment math. Always verify with a licensed professional before committing capital.
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