AtlasCalcsUtility Calculation Suite
2026-09-21 7 min read

Rental Property NOI Calculator

Net operating income after vacancy and every operating expense for a rental property. Live calculator with worked steps and charts.

Calculator

Purchase Price Help
$

The price you pay, before closing costs.

Monthly Rent Help
$

Gross scheduled rent before vacancy.

Vacancy & Credit Loss(%) Help
%

Share of scheduled rent lost to turnover and non-payment.

Property Tax (Annual)
$
Insurance (Annual)
$
Maintenance & Repairs(%) Help
%

Share of effective income budgeted for repairs.

Property Management(%) Help
%

Share of collected rent charged by the manager.

Advanced options (3)
Other Monthly Income Help
$

Laundry, parking, storage, late fees, pet rent.

Utilities (Annual, Landlord-Paid)
$
Other Expenses (Annual)
$

This rental property calculator runs on a full rental pro-forma: rent is annualised and reduced by vacancy, every operating expense is itemised to reach NOI, and the loan amortises monthly at the rate entered. Results update live as you type.

Amortization schedule

Balance Interest Payment
View:
YearInterestPrincipalEnding Balance
1$15,677.60$2,285.57$222,714.43
2$15,512.37$2,450.80$220,263.63
3$15,335.20$2,627.96$217,635.67
4$15,145.23$2,817.94$214,817.73
5$14,941.52$3,021.65$211,796.08
6$14,723.08$3,240.08$208,555.99
7$14,488.86$3,474.31$205,081.68
8$14,237.70$3,725.47$201,356.21
9$13,968.38$3,994.78$197,361.43
10$13,679.60$4,283.57$193,077.86
11$13,369.94$4,593.23$188,484.64
12$13,037.90$4,925.27$183,559.37
13$12,681.85$5,281.32$178,278.05
14$12,300.06$5,663.11$172,614.94
15$11,890.68$6,072.49$166,542.45
16$11,451.69$6,511.47$160,030.98
17$10,980.98$6,982.19$153,048.79
18$10,476.24$7,486.93$145,561.86
19$9,935.01$8,028.16$137,533.69
20$9,354.65$8,608.52$128,925.18
21$8,732.34$9,230.83$119,694.35
22$8,065.04$9,898.13$109,796.22
23$7,349.50$10,613.66$99,182.56
24$6,582.24$11,380.93$87,801.63
25$5,759.51$12,203.65$75,597.98
26$4,877.31$13,085.86$62,512.12
27$3,931.33$14,031.83$48,480.29
28$2,916.97$15,046.20$33,434.09
29$1,829.28$16,133.89$17,300.21
30$662.96$17,300.21$0.00

Results

Optimal

Net Operating Income

$21,387

Effective Gross Income

$29,640

Gross Scheduled Income

$31,200

Vacancy & Credit Loss

$1,560

Total Operating Expenses

$8,253

Property Tax

$3,000

Insurance

$1,400

Maintenance & Repairs

$1,482

Property Management

$2,371

Utilities

$0

Other Expenses

$0

Operating Expense Ratio

27.84%

Live results update as you type — currently showing net operating income of $21,387. Replace the defaults with your own rent roll, tax bill and insurance quote for an exact comparison.

Visualizations

Income Waterfall

31,200Gross rent
-1,560Vacancy
-8,253Opex
21,387NOI

Operating Expense Breakdown

Property tax36%
Insurance17%
Maintenance18%
Management29%
Utilities0%
Other0%

Loan Balance Over the Term

Formula

Net operating income is what the property earns before debt and income tax: effective gross income minus every operating expense — taxes, insurance, maintenance, management, utilities and other.

NOI = EGI − Operating expenses

Alternative Form

EGI = (Rent × 12 + Other income) × (1 − Vacancy %)

Variables

SymbolNameUnitDescription
EGIEGI$/yrScheduled income less vacancy and credit loss
OpExOpEx$/yrAll property-level operating costs
NOINOI$/yrEGI minus operating expenses

Explanation

NOI is the number the whole industry trades on: cap rate = NOI ÷ price, DSCR = NOI ÷ debt service, debt yield = NOI ÷ loan. Get NOI right and every metric inherits the accuracy.

Step-by-Step Calculation

Follow each step to understand how the result is calculated from your inputs.

Step 1

Start from everything the property is scheduled to earn.

Gross scheduled = rent × 12 + other income
Rent:$2,600.00
Other:$0
Result: $31,200
Step 2

Deduct vacancy and credit loss to get effective income.

EGI = gross scheduled − vacancy
Vacancy:5.00%
Intermediate: $31,200 − $1,560
Result: $29,640
Step 3

Deduct every operating expense. Debt service, depreciation and capital work never enter NOI.

NOI = EGI − operating expenses
Operating expenses:$8,253
Intermediate: $29,640 − $8,253
Result: $21,387 NOI
Final Answer
$21,387

Worked Examples

See how the calculator works with different scenarios.

Scenario

The rental property noi calculator run on the values above, showing the full calculation path rather than only the answer.

Inputs

Price:300000
Rent Monthly:2600

Calculation

1. Start from everything the property is scheduled to earn. → $31,200 2. Deduct vacancy and credit loss to get effective income. → $29,640 3. Deduct every operating expense. Debt service, depreciation and capital work never enter NOI. → $21,387 NOI

Result

Net Operating Income: $21,387

Interpretation

EGI $29,640 less $8,253 of operating expenses gives $21,387 of NOI — a 27.84% expense ratio.

Understanding Your Result

Your Result: Net Operating Income: $21,387

Typical range: A well-run residential building usually carries 35–45% operating expenses against effective income; this one models at 27.84%.

What This Means

NOI is the number the whole industry trades on: cap rate = NOI ÷ price, DSCR = NOI ÷ debt service, debt yield = NOI ÷ loan. Get NOI right and every metric inherits the accuracy.

Why It Matters

EGI $29,640 less $8,253 of operating expenses gives $21,387 of NOI — a 27.84% expense ratio.

Professional Interpretation

EGI $29,640 less $8,253 of operating expenses gives $21,387 of NOI — a 27.84% expense ratio.

How this is calculated

Net operating income is what the property earns before debt and income tax: effective gross income minus every operating expense — taxes, insurance, maintenance, management, utilities and other.

What drives the result

The pro-forma method: annualise the rent, deduct vacancy to reach effective gross income, subtract operating expenses to reach net operating income, then subtract debt service to reach cash flow. Each layer answers a different question — value (cap rate), lender safety (DSCR) and investor return (cash-on-cash).

Recommendations

  • •NOI is the single number every valuation metric reads from, so build it from real expense quotes, not a rule of thumb.
  • •Capital reserves are not an operating expense, but budgeting for them protects the NOI you underwrote.

Educational Content

Introduction

Rental analysis starts with one year of operations: scheduled rent, vacancy and credit loss, every operating expense, and the debt payment. NOI is what remains for the owner; everything else — cap rate, cash flow, DSCR, cash-on-cash — is NOI viewed from a different angle.

Concept Explanation

The pro-forma method: annualise the rent, deduct vacancy to reach effective gross income, subtract operating expenses to reach net operating income, then subtract debt service to reach cash flow. Each layer answers a different question — value (cap rate), lender safety (DSCR) and investor return (cash-on-cash).

Applications

▸Screening a listing against your price and return requirements in minutes
▸Comparing two or three candidate properties on the same pro-forma assumptions
▸Preparing a lender-ready one-year operating statement for a loan request
▸Setting rents and budgeting expenses for a property you already own

Benefits

  • •One consistent model across every property, so comparisons are fair
  • •Forces every expense to be named and budgeted rather than ignored
  • •Separates the property’s performance from the financing around it

Limitations

  • •A one-year pro-forma cannot capture capital expenditures that arrive in lumps — roofs, systems and exteriors need their own reserve
  • •Actual vacancy and expense ratios vary by market and management quality; a single assumption hides that spread
  • •The model assumes the rent roll is at market; in-place rents below market flatter the deal

Best Practices

  • •Build the pro-forma from your own quotes — insurance, taxes and management — not the seller’s summary
  • •Stress the deal: rent down 5%, vacancy up 5% — if it still pays, it will survive a soft year
  • •Fund a capital-expenditure reserve of about 5% of rent before calling any cash flow "positive"

Common Misconceptions

Myth: NOI is the profit the owner pockets.
Truth: NOI comes before the mortgage payment; only cash flow (NOI − debt service) reaches the owner’s bank account.
Myth: A property with positive cash flow is always a good deal.
Truth: Positive cash flow on an overpriced building can still be a worse investment than the same cash in an index fund — compare returns, not just sign.
Myth: Operating expenses are optional line items.
Truth: Vacancy, maintenance and management are real costs even when self-managed; underwriting them at zero inflates the price you can justify.

Practical Tips

  • •Itemise every expense before you price the deal — an unnamed expense is an unpaid one
  • •Rebuild NOI annually; assessment increases and insurance renewals move it more than rent does

Common Mistakes

Deducting the mortgage from NOI.
Debt service sits below NOI; including it double-counts in cap rate and DSCR math.
Forgetting management even when self-managing.
Your labour has a market cost; underwriting 8–10% management keeps the deal honest and preserves resale math.

Assumptions

This calculator makes the following assumptions to provide estimates:

Operating expenses only: NOI excludes capital improvements, income tax and debt payments.

Limitations

Be aware of these limitations when using this calculator:

Limitation: A one-year pro-forma cannot capture capital expenditures that arrive in lumps — roofs, systems and exteriors need their own reserve
Limitation: Actual vacancy and expense ratios vary by market and management quality; a single assumption hides that spread
Limitation: The model assumes the rent roll is at market; in-place rents below market flatter the deal

Frequently Asked Questions

Answers to common questions about this calculator.

Does NOI include the mortgage payment?
No. NOI is before debt service by definition; subtracting the mortgage gives cash flow instead.
Who uses the rental property noi calculator?
It is used by rental investors screening and pricing deals, by owner-operators budgeting expenses and rents, and by agents, lenders and advisers sanity-checking the numbers before money moves. It sits in the Rental Property group of the Real Estate Investing section of Atlascalcs.
How accurate is the rental property noi calculator?
Every figure follows from the inputs using standard property underwriting mathematics, so it is accurate to the quality of the values you enter. Lenders, appraisers and tax assessors each apply their own adjustments, so expect small differences against formal documents.
Do I need to sign up or pay to use this calculator?
No. Every Atlascalcs calculator is free, runs entirely in your browser and never asks for an account. Nothing you enter is uploaded or stored.
Can I use these numbers in a formal valuation or loan application?
The calculator is an underwriting aid, not an appraisal or a lender offer. Lenders and appraisers apply their own adjustments, so treat the output as a disciplined estimate to bring to those conversations.
How do I choose realistic inputs?
Pull rent from comparable leases, property tax from the current assessment, insurance from a quote, and management and maintenance from what operators in your market actually pay. Seller pro-formas are marketing documents.

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Related Guides

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Glossary

Technical terms used in mortgage calculations explained in plain language.

Net Operating Income (NOI)
Effective gross income minus operating expenses, before debt service and income tax. The core measure of a property’s earning power.
Effective Gross Income (EGI)
Scheduled rent plus other income, less vacancy and credit loss.
Vacancy and Credit Loss
The share of scheduled rent never collected, from turnover, downtime and non-payment.
Pro-Forma
A forward-looking operating statement projecting income and expenses, as opposed to the historical statement.

Authoritative References

Trusted sources and standards referenced by this calculator.

Applicable Standards

Level-payment amortisation, payments assumed in arrearsIncome and expenses annualised; percentages entered as annual ratesStraight-line depreciation per IRC §168 recovery periodsMoney rounded for display only; all calculations run at full precision

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Page Information

Last Updated:

2026-09-21

Version:

2.0.0

License:

Free to use for educational and professional purposes.