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Calcimator

Operating Expense Ratio Calculator

Calculate OER and benchmark operating expenses against effective gross income.

Inputs

$
%
$/yr
$/yr
$/yr
$/yr
$/yr
$/yr

Results

Operating Expense Ratio

38.89%

Net Operating Income

$167,200.00

≈ 11 used cars

Total Operating Expenses$106,400.00
Effective Gross Income$273,600.00
NOI Margin61.11%
Expense per Unit$5,320.00
Taxes as % of Expenses33.83%
Management as % of EGI7.31%
How to Use This Calculator
  1. Enter Gross Annual Income — total scheduled rent before vacancy.
  2. Set Vacancy Rate % and enter each expense category: Taxes, Insurance, Maintenance, Utilities, Management.
  3. Add Other Expenses (legal, accounting, landscaping) for a complete picture.
  4. Review Operating Expense Ratio (OER) — a healthy range is 35–50% for most residential properties.
  5. Check NOI and compare against debt service to evaluate overall profitability.
  6. Use OER trends over time to identify expense creep and management efficiency issues.

How the result changes with Gross Annual Income

Gross Annual IncomeOperating Expense RatioNet Operating Income
$5,000,000.002.24%$4,643,600.00
$17,500,000.000.64%$16,518,600.00
$32,500,000.000.34%$30,768,600.00
$45,000,000.000.25%$42,643,600.00

What each input means

Gross Annual Income
Total scheduled annual rental income.
Vacancy Rate
Expected vacancy and collection loss percentage.
Total Units
Total number of units for per-unit calculations.
Property Taxes
Annual property taxes.
Insurance
Annual property insurance.
Maintenance & Repairs
Annual maintenance, repairs, and capital reserves.
Utilities
Annual owner-paid utilities (common areas, water, etc.).
Management Fee
Annual property management fees.
Other Expenses
Other annual expenses (legal, accounting, landscaping).

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Gross Annual Income = 288000, Vacancy Rate = 5, Total Units = 20, Property Taxes = 36000 = 9 input(s) provided
  2. Calculate Operating Expense Ratio
    Operating Expense Ratio
    38.89 = 38.89%
  3. Calculate Net Operating Income
    Net Operating Income
    167200 = $167,200
  4. Calculate Total Operating Expenses
    Total Operating Expenses
    106400 = $106,400
  5. Calculate Effective Gross Income
    Effective Gross Income
    273600 = $273,600

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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