Portfolio NOI Calculator

Portfolio NOI aggregates individual properties. This calculator computes the total with weighted metrics.

Total gross revenue

Total operating expenses

Number of properties

Portfolio NOI

$6,800,000

NOI margin %

56.67%

Avg NOI per property

$680,000

How the math works

NOI = gross revenue − operating expenses. Margin = NOI ÷ revenue.

Portfolio NOI is the number buyers and lenders anchor to. Track trailing-12 quarterly; any 2-consecutive-quarter decline requires operational review before lender calls.

How to Use

Enter total gross revenue.
Enter total operating expenses.
Enter number of properties.
Read portfolio NOI.

Frequently Asked Questions

NOI definition?

Gross operating income − operating expenses (before debt service, taxes, depreciation, capex, reserves). Pure real-estate operating performance.

Aggregation method?

Simple sum across properties. Weight each property's NOI margin by size to understand portfolio efficiency. Outlier properties drag averages.

Portfolio insight?

YoY NOI growth should track market rent growth minus expense growth. Stagnant NOI with rising rents = expense leakage. Falling NOI with stable rents = occupancy or credit losses.

How often should I rerun this?

Rerun this calculator whenever inputs change materially — new rent roll data, rate moves, loan balance updates, or quarterly operating data. For active deals, monthly refresh is typical. For stabilized assets under monitoring, quarterly is fine. Treat the output as a decision tool, not a one-time answer — market conditions evolve and so should your analysis.