Net Operating Income Calculator

Written by Great Medico

Updated September 25, 2026 •2 min read

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When a finance decision has several moving parts, transparent arithmetic matters. Net Operating Income Calculator estimates property net operating income from area, rent per area, other income, occupancy rate, and operating expenses using the inputs you provide rather than an unstated market forecast.

What this calculator does

Net Operating Income Calculator estimates property net operating income from area, rent per area, other income, occupancy rate, and operating expenses. The visible inputs are area, rental per area, other income, occupancy rate, and operating expenses. Its result is driven by those values, so the calculation can be reproduced or stress-tested without relying on a hidden live-data feed.

How to use it

Enter Area, Rental per area, Other income, Occupancy rate, and Operating expenses. Keep all monetary inputs in the same currency; the currency selector formats results and does not perform foreign-exchange conversion. Enter percentage or rate fields on the scale displayed by the form; do not silently convert them to a different percentage or decimal convention. Before calculating, recheck Area, Rental per area, Other income against the source values you intend to model. Use the labels on Net Operating Income Calculator as the source of truth and recheck any prefilled value before relying on the result.

How the calculation works

Potential base rent = area × rent per area. Effective base rent = potential base rent × occupancy rate. NOI = effective base rent + other income − operating expenses. Net Operating Income Calculator applies that relationship only to the inputs represented on its form. If the result looks surprising, verify the entered values, units, and signs before interpreting the number.

Example

For 10,000 square feet at $20 annual rent per square foot, 95% occupancy, $5,000 of other income, and $50,000 of operating expenses, effective base rent is $190,000 and modeled NOI is $145,000. The example is a math check for Net Operating Income Calculator; replace the sample values with your own inputs rather than treating the example as a target or recommendation.

How to interpret the result

NOI measures property-level operating income before financing and income taxes. A lower occupancy assumption reduces effective rent before operating expenses are deducted. The result describes the entered scenario; it does not replace the broader legal, tax, lending, or investment context.

Limitations and notes

Use consistent annual or monthly units for rent and expenses. Capital expenditures, depreciation, mortgage payments, income taxes, owner-specific costs, and one-time items are generally outside NOI unless explicitly included in the entered operating expenses. Treat the output as an estimate built from the displayed inputs, not as a guarantee of a future payment, tax, return, approval, or legal obligation.