Cap Rate Calculator

What the Cap Rate Calculator Does and Who It's For

This cap rate calculator finds the capitalization rate of an income-producing property: the annual return you would earn if you bought the property in cash, with no mortgage. Enter the net operating income (NOI) and the property value or purchase price, and the tool returns the cap rate as a percentage.

It's built for real estate investors, landlords, agents, and appraisers who want a quick, apples-to-apples way to compare rental properties. Because cap rate ignores financing, it isolates the property's own earning power, which makes it useful for screening deals before you dig into loan terms or tax details.

How Cap Rate Works: The Formula

The capitalization rate is the ratio of a property's net operating income to its value:

Cap Rate = Net Operating Income / Property Value

NOI is the income left after operating expenses but before mortgage payments. Calculate it as gross rental income, minus vacancy and credit losses, minus operating expenses such as property taxes, insurance, management, repairs, and maintenance. Crucially, NOI excludes mortgage principal and interest, depreciation, and capital expenditures like a new roof.

Because financing is left out, cap rate measures an unleveraged return. The same formula can be rearranged to estimate value (Value = NOI / Cap Rate) or the income a property must produce to justify a price (NOI = Value x Cap Rate).

Worked Example With Real Numbers

Suppose a small apartment building rents for $60,000 a year. You expect 5% vacancy and credit loss, which is $3,000, leaving effective gross income of $57,000.

Operating expenses run $22,000 a year (taxes, insurance, management, repairs, landscaping). That gives NOI = $57,000 - $22,000 = $35,000.

If the asking price is $500,000, then Cap Rate = $35,000 / $500,000 = 0.07, or 7%. Flip it around: if comparable buildings in the area trade at a 6% cap rate, the implied value is $35,000 / 0.06 = $583,333, suggesting the $500,000 price may be attractive.

Factors That Affect the Result

A property's cap rate is shaped by both its numbers and its market. Knowing what moves it helps you read a figure correctly.

Key drivers include:

• Location and asset class: prime urban properties usually carry lower cap rates; secondary markets and riskier assets carry higher ones.
• Interest rates: as borrowing costs rise, buyers often demand higher cap rates, pushing prices down.
• Expense accuracy: leaving out management or maintenance overstates NOI and inflates the cap rate.
• Lease quality: long, stable, credit-tenant leases support lower cap rates than short or uncertain ones.
• Growth expectations: properties with strong rent-growth potential can trade at lower cap rates today.

Common Mistakes and Practical Tips

The most frequent error is treating cap rate as a complete return. It excludes financing, taxes, and appreciation, so it is a starting point, not the whole picture. Pair it with cash-on-cash return and internal rate of return when you analyze a leveraged deal.

Use realistic, normalized NOI rather than a seller's best-case proforma, and always include a vacancy allowance even for a fully occupied building. Compare cap rates only among similar properties in the same market, since a 5% cap in one city may signal the same risk as an 8% cap in another.

Finally, remember that a higher cap rate is not automatically better: it often reflects higher risk, weaker location, or deferred maintenance. Lower cap rates usually mean safer, more competitive assets.