Operating Expense Calculator (USA)
Analyze a rental or investment property. See your Net Operating Income (NOI), cap rate, operating expense ratio, monthly cash flow, DSCR, and cash-on-cash return — plus a multi-year pro forma projection.
| Yr | Gross | Vacancy | EGI | Op Exp | NOI | Debt | Cash Flow |
|---|---|---|---|---|---|---|---|
| Calculate to see pro forma | |||||||
How to use the operating expense calculator
Four quick steps turn a property’s income and costs into a full investment picture — NOI, cap rate, cash flow, DSCR, cash-on-cash, and a multi-year pro forma you can download.
Enter property & income
Price, units, gross rent, other income, and expected vacancy.
Add operating expenses
Taxes, insurance, management, repairs, utilities, HOA, and reserves.
Add financing
Mortgage payment, cash invested, and rent/expense growth rates.
Read results & save a PDF
See every metric and a year-by-year pro forma, then download it.
How the numbers are calculated
The calculator builds effective gross income, subtracts operating expenses to get net operating income, then layers on financing to reach cash flow and returns. Here is the exact chain of math behind every metric.
Worked example — $500,000 property, $4,000/mo rent, 5% vacancy
Effective gross income: 48,000 − 2,400 + 1,800 = 47,400
Operating expenses: ≈ 19,000 / yr
Net operating income: 47,400 − 19,000 = 28,400
Cap rate: 28,400 ÷ 500,000 = 5.7%
≈ $28,400 NOI and a 5.7% cap rate — then debt service turns NOI into cash flow, DSCR, and cash-on-cash return.
Operating expense & NOI charts
Handy lookups for the questions people ask most — cap rate by NOI and price, what DSCR levels mean, typical expense shares, and how cash-on-cash reads. Ranges are general guidance; property types and markets vary.
| Annual NOI | $400k | $500k | $600k | $750k |
|---|---|---|---|---|
| $24,000 | 6.0% | 4.8% | 4.0% | 3.2% |
| $30,000 | 7.5% | 6.0% | 5.0% | 4.0% |
| $36,000 | 9.0% | 7.2% | 6.0% | 4.8% |
| $45,000 | 11.3% | 9.0% | 7.5% | 6.0% |
Cap rate = net operating income ÷ price. For the same NOI, a higher price lowers the cap rate; for the same price, more NOI raises it.
| DSCR | General read | Note |
|---|---|---|
| Under 1.00 | Income won’t cover debt | Negative cash flow |
| 1.00 – 1.20 | Thin coverage | Little cushion |
| 1.20 – 1.25 | Common lender minimum | Acceptable to many lenders |
| 1.25 – 1.50 | Healthy coverage | Comfortable margin |
| 1.50+ | Strong coverage | Well cushioned |
DSCR = net operating income ÷ annual debt service. Most lenders look for at least 1.20 to 1.25; higher gives more room for vacancy and rising costs.
| Category | Rough share | Note |
|---|---|---|
| Property taxes | 8 – 15% | Varies widely by state |
| Insurance | 3 – 6% | Higher in disaster-prone areas |
| Management | 6 – 10% | Of collected income |
| Repairs & maintenance | 5 – 10% | More for older buildings |
| CapEx reserves | 5 – 10% | For big-ticket replacements |
Illustrative shares, not rules — utilities, HOA, and services vary by property. Together these typically put the operating expense ratio around 35 to 50 percent.
| Annual cash flow | $100k in | $130k in | $160k in |
|---|---|---|---|
| $4,000 | 4.0% | 3.1% | 2.5% |
| $6,500 | 6.5% | 5.0% | 4.1% |
| $9,000 | 9.0% | 6.9% | 5.6% |
| $12,000 | 12.0% | 9.2% | 7.5% |
Cash-on-cash = annual cash flow ÷ total cash invested. The less cash you tie up for a given cash flow, the higher the return on that cash.
gross income
expenses
income
Every metric flows from one subtraction: take effective gross income, remove operating expenses, and the net operating income left over drives cap rate, cash flow, and returns.
- Effective gross income — rent after vacancy, plus other income.
- Operating expenses — running costs, without mortgage or income taxes.
- Net operating income — the engine behind cap rate, DSCR, and cash flow.
Everything the calculator works out
A handful of inputs give you the full investment picture — the income statement, the return metrics, and a multi-year projection.
Key figures behind the analysis
Built for any rental analysis
From underwriting a purchase to reviewing a property you own, the same calculator turns income and costs into a clear, comparable set of metrics.
Wants to know the NOI, cap rate, and cash flow a listing really produces before making an offer.
- Stress-test the seller’s expenses
- Compare cap rate across deals
- Check DSCR before financing
Runs a rental and wants to see where expenses go and how to lift NOI and cash flow.
- Spot the biggest expense lines
- Track the expense ratio over time
- Project NOI with a pro forma
Cares about cash-on-cash, coverage, and the break-even occupancy that keep a leveraged deal safe.
- Measure cash-on-cash return
- Watch DSCR and break-even
- Model growth over the hold
7 tips for analyzing operating expenses
A few habits keep your NOI honest and your returns realistic.
Operating expense calculator FAQ
The definition, calculation, and return questions people ask most about operating expenses, NOI, and cash flow.
Operating expenses are the recurring costs of running a rental day to day: property taxes, insurance, management, repairs and maintenance, owner-paid utilities, HOA dues, landscaping, and a reserve for capital replacements.
They do not include the mortgage payment, income taxes, or depreciation, because those are financing and accounting items rather than the cost of operating the building. Operating expenses are what you subtract from effective gross income to get net operating income.
Net operating income, or NOI, is effective gross income minus total operating expenses. Effective gross income is gross scheduled rent minus vacancy and credit loss, plus other income such as parking or laundry.
A property with $49,800 in effective gross income and $19,000 in operating expenses has an NOI of $30,800 a year. NOI is calculated before debt service and income taxes, so it reflects performance independent of financing.
The capitalization rate, or cap rate, is net operating income divided by the property value or price, shown as a percentage. It estimates the unleveraged annual return a property produces.
A property with $30,000 of NOI and a $500,000 price has a cap rate of 6%. A higher cap rate usually means more return but often more risk; a lower one is common in stable markets. Compare cap rates among similar properties in the same area.
The operating expense ratio is total operating expenses divided by effective gross income. For many residential rentals it runs roughly 35 to 50 percent, though it varies with property age, who pays utilities, and whether management is included.
A ratio that looks unusually low can hide deferred maintenance or missing reserves, while a high ratio points to heavy costs or soft rents. Compare a property’s ratio to similar buildings in the same market rather than to a single national benchmark.
The debt service coverage ratio, or DSCR, is net operating income divided by annual debt service. It shows how comfortably income covers the mortgage, and lenders use it to size loans.
A DSCR of 1.25 means the property earns $1.25 of NOI for every $1 of debt payment — a common lender minimum. A DSCR below 1.0 means the property does not generate enough income to cover the mortgage on its own, signalling negative cash flow.
Cash-on-cash return is annual pre-tax cash flow divided by total cash invested, shown as a percentage. Total cash invested usually means the down payment plus closing costs and any upfront rehab.
If a property produces $6,500 of annual cash flow on $130,000 invested, the cash-on-cash return is 5%. Unlike the cap rate, it accounts for financing, so it reflects the return on the cash you actually put into the deal.
Views differ. Strictly, capital expenditures for big-ticket replacements like a roof or HVAC are capital items, not operating expenses. In practice, many investors set aside a monthly CapEx reserve and include it so the analysis reflects the true long-run cost of ownership.
This calculator includes a CapEx reserve line in operating expenses by default, so NOI and cash flow are more conservative. To match a strict accounting definition, set the reserve to zero and track capital costs separately.
Break-even occupancy is the share of potential income a property must collect to cover both operating expenses and debt service. It is operating expenses plus debt service, divided by gross potential income.
A break-even occupancy of 80 percent means the property can lose up to 20 percent of its income to vacancy before it stops covering its bills. A lower figure gives more cushion; a figure near 100 percent leaves little margin for error.
General Estimating Notice: This calculator computes net operating income, cap rate, cash flow, DSCR, cash-on-cash return, and a multi-year pro forma from the income and expenses you enter. Net operating income excludes debt service, income taxes, and depreciation, and results depend entirely on the accuracy of your inputs and assumptions. Figures are illustrations, not a valuation, appraisal, or financial, tax, or investment advice. Verify every figure against actual operating statements and consult a licensed advisor before making an investment decision. For planning purposes only.