How Do I Calculate Cap Rate and Other Investment Metrics?

How Do I Calculate Cap Rate and Other Investment Metrics?

Cap rate is calculated by dividing a property’s net operating income by its purchase price or market value. The formula is simple: cap rate equals NOI divided by value. If a building has $1,000,000 of NOI and a value of $20,000,000, the cap rate is 5%.

That formula is useful, but it is not the whole story. A serious commercial real estate buyer should understand cap rate, price per square foot, cash-on-cash return, debt service coverage, debt yield, stabilized yield, IRR, equity multiple, replacement cost, and downside basis. Each metric answers a different question.

Start with NOI

Before calculating any metric, confirm net operating income. NOI is gross income minus operating expenses before debt service, depreciation, income taxes, and capital events. The quality of the NOI matters more than the formula. Actual NOI, seller-projected NOI, and stabilized NOI can produce very different values.

Buyers should review rent rolls, leases, reimbursements, vacancies, free rent, concessions, real estate taxes, insurance, repairs, utilities, payroll, management, and reserves. If the income or expenses are wrong, every return metric will be wrong too.

Core commercial real estate metrics

• Cap rate: NOI divided by value. Useful for comparing income yield before debt.

• Price per square foot: purchase price divided by building square footage. Useful for basis comparisons.

• Cash-on-cash return: annual pre-tax cash flow divided by cash invested. Useful when leverage matters.

• DSCR: NOI divided by annual debt service. Useful for lender sizing and financing risk.

• Debt yield: NOI divided by loan amount. Useful for lender downside protection.

• IRR and equity multiple: useful for multi-year hold analysis, but highly sensitive to exit assumptions.

Why cap rate alone can mislead buyers

A high cap rate is not automatically a good deal. It may reflect vacancy, weak tenants, short lease terms, old building systems, tax exposure, bad location, financing risk, or heavy capital needs. A low cap rate is not automatically a bad deal either. It may reflect strong credit, durable income, future rent growth, scarcity, or long-term redevelopment value.

In NYC, two buildings with the same cap rate can have completely different risk profiles. One may have strong long-term tenants and minimal near-term rollover. Another may have temporary income, deferred maintenance, and a tax reassessment issue. The number only makes sense when the story behind the number is understood.

Metrics for off-market investment sales

In an off-market process, the buyer may not receive every document on day one. That means early underwriting should use conservative assumptions and identify exactly what needs to be verified. The buyer should separate actual income, adjusted income, stabilized income, and upside income so the seller can understand the logic behind the offer.

For owners, understanding these metrics helps explain why buyers may view the same building differently. A value-add buyer, a 1031 buyer, a conversion buyer, a ground lease tenant, and a long-term family office may not underwrite the same asset the same way.

For the broader pricing framework, read How Much Should I Offer on a Commercial Building in New York? and Manhattan’s Off-Market Investment Sales Authority.

FAQ

What is the cap rate formula?

Cap rate equals net operating income divided by purchase price or market value. It measures unlevered income yield before debt service.

Is a higher cap rate always better?

No. A higher cap rate may mean higher return, but it may also mean higher risk. Buyers need to understand lease quality, tenant credit, vacancy, taxes, capital needs, and location before deciding whether the return is attractive.

What metric matters most?

No single metric is enough. Cap rate, price per square foot, cash-on-cash return, DSCR, debt yield, and exit basis should be reviewed together with the asset’s risk profile.

Important note: This article is general information only and is not legal, tax, financing, zoning, engineering, brokerage-agency, or investment advice. Every transaction requires separate professional review.