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Operating Margin Calculator
Operating margin = NOI ÷ gross potential rent. It tells you what share of rent actually becomes cash flow after operating expenses. Different asset classes have different natural margins — luxury multifamily runs 58-65%, class B suburban 50-55%, class C workforce 42-48%. This calculator computes it and benchmarks.
Operating margin
57.61%
NOI
$161,300
Asset class benchmark
53.0%
Margin vs benchmark
4.6%
Effective gross income
$263,200
Total operating expenses
$101,900
How the math works
$280K gross rent − 6% vacancy = $263K EGI. Minus $102K opex = $161K NOI. Margin = 57.5% — above the 53% class B benchmark by 4.5 points. Strong.
Margins above benchmark can indicate either great ops or under-reported expenses (deferred maintenance). Margins below can indicate weak ops or high tax/insurance unique to the submarket. Dig before drawing conclusions.
How to Use
- Enter gross potential rent and itemized operating expenses.
- See NOI, operating margin, and comparison to your asset class benchmark.
Frequently Asked Questions
What counts as operating expense?
Property tax, insurance, management fee, repairs & maintenance, utilities (if landlord-paid), marketing, professional fees, HOA, groundskeeping. NOT operating: mortgage interest, depreciation, capital improvements, owner salary if non-services.
Is 50% rule still a good benchmark?
Only for quick first-pass screening. 'Operating expenses = 50% of rent' is aggressive for class A (often 40-45%) and conservative for class C (often 55-60%). Use it to flag suspicious listings; do real math for underwriting.
Should capex be deducted?
From NOI, no — capex is below the line. For cash flow, yes — reserve for roof, HVAC, appliance replacement. Typical capex reserve: $200-$400/unit/year for class B, $400-$600 for class C. Separate line from operating expenses.
How do I benchmark my margin?
Compare to IREM/NAA data for your asset class and market. National averages: luxury class A 58-63%, class B suburban 50-55%, class C 40-48%. Your submarket may vary — check local operator groups or broker reports.
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