Cap Rate Calculator

What this calculator does

The capitalization rate is the yield a property produces independent of how it is financed. Enter the property value, its net operating income, and the monthly rent, and the calculator returns the cap rate, the implied value at various yields, and the gross rent multiplier as a cross-check.

Cap rate is NOI divided by value, and the relationship runs both ways. Given a price you get a yield; given a yield you get a value. That second direction is how commercial property is actually appraised, and it is why the implied value table above matters as much as the headline percentage — it shows what the same income stream is worth to buyers with different return requirements.

When to use it

Use it to compare properties that differ in price, size, and financing. Because the mortgage is excluded, a $600,000 fourplex and a $3 million apartment building can be ranked on the same scale, which is the entire reason the metric exists.

It is also the right tool for testing a seller's asking price against the market. If comparable buildings in the submarket trade at 6.5 percent and the asking price implies 5.2 percent, you have a specific, defensible number to negotiate against. And it quantifies value-add work: at a six percent cap, every $1,000 of annual NOI you add through rent increases or expense reduction is worth roughly $16,700 in resale value.

Understanding the inputs

Property value should be the asking or appraised price when you are calculating a yield, or left aside when you are working the other direction from NOI and a market cap rate. Net operating income is the input that decides whether the whole exercise is useful: it must be annual effective gross income after vacancy, less all operating expenses, and it must exclude mortgage payments, depreciation, and capital expenditure.

Include a market-rate management fee even if you self-manage, and include reserves for roofs and mechanical systems even though they are technically capital items — omitting them is how pro forma NOI gets inflated. Monthly rent feeds the gross rent multiplier, which is a rougher screen that ignores expenses entirely.

How is this calculated?

Cap Rate = (Net Operating Income / Property Value) × 100. NOI = Annual Rent − Operating Expenses.

A worked example

Take a small apartment building listed at $1,200,000 producing $78,000 of net operating income after taxes, insurance, management, maintenance, and reserves. The cap rate is $78,000 divided by $1,200,000, or 6.5 percent. Gross rents of $9,500 a month give $114,000 a year, so the gross rent multiplier is about 10.5.

Now run it the other way. If comparable buildings in the submarket are trading at seven percent, the same $78,000 of NOI implies a value of about $1,114,000 — roughly $86,000 below the asking price. That is the negotiating position. Conversely, if you can raise NOI to $85,000 by bringing below-market units to market rent, the value at a 6.5 percent cap becomes about $1,308,000.

Limitations and assumptions

Cap rate is only as good as the NOI behind it, and NOI is the most manipulated figure in commercial real estate marketing. Pro forma numbers routinely assume full occupancy, no management fee, no reserves, and current-owner property taxes that will reset on sale — each of which can shift the cap rate by half a point or more.

The metric is also a single-year snapshot that says nothing about rent growth, lease rollover, tenant credit, deferred maintenance, or what happens when your loan matures. It cannot compare a stabilized asset against a value-add project meaningfully, since the latter's current NOI understates its potential. Use cap rate for screening and pricing, then move to a full cash flow model with an internal rate of return before committing capital.