Cap Rate Calculator and Formula: A Practitioner's Guide

Free Cap Rate Calculator

Enter two of the three values below to solve for the third. The calculator works in both directions: input NOI and property value to get cap rate, or input NOI and cap rate to get implied value.

What Cap Rate Actually Is

The capitalization rate — cap rate — is the ratio of a property's net operating income to its market value. It is the single most-quoted metric in commercial real estate because it answers the question every buyer asks first: what yield does this property produce on day one?

The formula is short: Cap Rate = NOI ÷ Property Value. A property generating $1,000,000 of NOI and trading at $20,000,000 carries a 5.0% cap rate. A property at the same NOI trading for $25,000,000 carries a 4.0% cap rate. Lower cap rate, higher price, lower yield — and, typically, lower perceived risk.

Cap rate is most useful as a basis indicator for stabilized, income-producing assets. It is least useful for properties undergoing major capital work, lease-up, or repositioning, where the in-place NOI doesn't reflect the stabilized economics. Knowing which case you're in — and what cap rate to use — is the difference between a useful first-pass screen and a misleading one.

The Cap Rate Formula

The cap rate formula has three rearrangements, all sides of the same equation:

• Cap Rate = NOI ÷ Property Value — the standard form, used when you know the price and want the yield.
• Property Value = NOI ÷ Cap Rate — used when you have an NOI and a market cap rate, and want the implied value.
• NOI = Property Value × Cap Rate — used when you have a target value and want the NOI required to justify it.

The hard part is not the formula. It's defining NOI correctly. Different practitioners include or exclude different line items, and small definitional differences can swing the cap rate by 25 basis points or more on the same deal. Standard NOI is gross revenue, less vacancy and credit loss, less operating expenses, with capital reserves typically excluded above the NOI line.

The big disagreements: how to treat replacement reserves, whether management fees are at-market or in-house, whether tenant improvements and leasing commissions are above- or below-line, and how to normalize for one-time income (lease termination fees, settlement payments) and one-time expenses (storm damage, deferred maintenance). Two analysts can underwrite the same property and arrive at NOIs that differ by 5%, which translates to a 5% swing in implied value at the same cap rate.

Cap Rate Decomposition (Gordon Growth Model)

Where does a market cap rate come from? At the institutional level, cap rates are not arbitrary — they decompose into a build-up of three components: a risk-free baseline (typically the 10-year Treasury), a property-specific risk premium, and an offset for long-run NOI growth. The relationship comes from the Gordon Growth Model: cap rate = required return − long-run growth rate.

This decomposition matters because it tells you when cap rates are likely to move. A 100 bps move in the 10-year Treasury, holding risk premium and growth constant, shifts implied cap rates by 100 bps. That's why CRE valuations moved as dramatically as they did across 2022–2024 — the risk-free leg of the build-up repriced violently. Risk premiums adjust more slowly; growth assumptions adjust slowest of all.

Worked Example: NOI Build-Up

A 180-unit garden-style multifamily property in Phoenix. In-place rent roll shows $2.7M of gross rental income. Other income (parking, laundry, pet fees) adds $135,000. Vacancy and credit loss is running at 5.5% — the market sits at 5%, but two units are off-line for renovation. Operating expenses total $1.32M, including a 3% asset management fee. Replacement reserves are $300/unit/year ($54,000), held below the NOI line.

At an asking price of $27,300,000, the going-in cap rate is $1,366,500 ÷ $27,300,000 = 5.00%. If the Phoenix submarket trades at 5.25% for comparable assets, the deal is priced about 25 basis points inside the market — the buyer is paying a premium versus comps and needs to underwrite where that premium comes from (rent growth, expense compression, exit cap compression, or a story they're paying for).

Going-In Cap vs. Exit Cap

Going-in cap is computed on year-one stabilized NOI and the acquisition price. Exit cap is what the next buyer pays on the projected year-N NOI when you sell. Both matter, and they don't have to be the same number.

The relationship between going-in and exit cap rates encodes a deal's reversion risk. If you buy at a 5% going-in cap and underwrite to a 5.5% exit cap, you've assumed cap-rate expansion — the basis you're selling into is wider than the one you bought at. This is a conservative assumption in most environments. Buying at 5% and selling at 4.75% is cap-rate compression — you're betting the market gets tighter, which it sometimes does, but is a riskier underwrite to bring to investment committee.

A common institutional convention, supported by CBRE's historical data on multifamily cap rate spreads, is to underwrite exit cap 25–50 basis points wider than going-in for value-add deals, and flat-to-25-bps wider for core deals. Wider spreads reflect the analyst's view on interest rate trajectory and supply-demand fundamentals at the projected exit date.

Seven Mistakes Practitioners Make

Cap rate is simple enough to weaponize against yourself. Seven errors we've seen kill deals (or worse, fund bad ones):

• Conflating cap rate with yield on equity. Cap rate is an unlevered metric. Your actual equity yield depends on leverage, debt cost, and capital reserves. A 5.0% cap property with 65% LTV agency debt at 6.0% all-in cost produces negative levered yield in year one — the property earns less than its debt costs. This is negative leverage and it can persist for years if NOI growth doesn't outpace the debt cost gap. Cap rate alone hides it.

• Using in-place NOI on a value-add or development deal. The going-in cap on a 50%-occupied value-add property is meaningless — the in-place NOI doesn't reflect the stabilized economics. Either underwrite a stabilized cap on the year-3 NOI projection, or skip cap rate entirely for these deals and underwrite on yield-on-cost and IRR. Cap rate is a stabilized-asset metric.

• Treating going-in cap = exit cap. Holding cap rates constant from entry to exit is a ten-second underwriting shortcut that hides the deal's biggest assumption. Most institutional shops require 25–50 bps of exit cap expansion for value-add and flat-to-25-bps for core. If your model uses the same cap on both ends, you're implicitly betting the market environment in year 5 is identical to today.

• Including replacement reserves above the NOI line. Some practitioners deduct $250–$400 per unit per year for capital reserves before computing NOI. The institutional convention — per the NCREIF and MBA reporting standards — is to hold reserves below the NOI line. Mixing conventions makes your cap rate non-comparable to broker comps and submarket data.

• Pricing off a national cap rate when the deal is in a tertiary market. National benchmarks (NCREIF, MSCI RCA) are population-weighted toward gateway markets. A "5.25% multifamily core" benchmark may be 100–200 bps tighter than what's actually trading in your specific submarket. Use transaction-based, submarket-specific data — Real Capital Analytics's submarket cap rate publications, broker BOVs from recent transactions, or the appraisal comps for similar product.

• Trusting the broker's NOI without normalizing it. Broker NOIs typically add back T-12 vacancy below market, treat one-time expenses as non-recurring, normalize management fees to a "market" rate even if the property is owner-managed, and assume rent growth that's already in the price. Always rebuild the NOI from the rent roll and T-12 yourself. Differences of 5–10% between broker NOI and underwritten NOI are common.

• Ignoring lease rollover in office and retail underwrites. A 7.5% in-place cap on an office building looks attractive until you discover 60% of the tenants roll within 24 months at rents 30% below market. The 7.5% is real today but expires when the leases do. The right metric for rollover-heavy assets is a stabilized cap computed on mark-to-market rents, modeled tenant-by-tenant in a rollover schedule — not a snapshot cap on in-place NOI.

What's a Good Cap Rate?

"Good" depends entirely on asset class, market, and strategy. As of May 2026 — with the 10-year Treasury yielding around 4.20% and the multifamily refinance wave still working through 2021–2022 vintage debt — broad institutional ranges look like this:

• Multifamily core (gateway markets): 4.50%–5.25%
• Multifamily core-plus (secondary markets): 5.00%–5.75%
• Multifamily value-add: 5.50%–6.50% (going-in, before stabilization)
• Industrial core (Tier 1 logistics): 4.75%–5.50%
• Suburban office (Class A): 7.00%–8.50%
• Anchored retail: 6.50%–7.75%
• Self-storage: 5.50%–6.50%
• Hospitality (full-service): 7.50%–9.00%

These ranges shift with the rate environment. The NCREIF Property Index publishes quarterly cap rate data by sector and is the standard appraisal-based benchmark for institutional underwriting. Green Street and MSCI Real Capital Analytics publish transaction-based cap rate benchmarks that often lead the appraisal-based NCREIF index by one to two quarters — useful when the market is repricing and appraisals haven't caught up. For markets without sufficient institutional transaction data, fall back to broker-published cap rate surveys from CBRE, JLL, and Cushman & Wakefield, which publish quarterly.

When Cap Rate Misleads

Cap rate is a snapshot. It says nothing about tomorrow's income, the path of cash flows, the financing structure, or the exit assumption. Three situations where cap rate, used alone, will lead you wrong:

The value-add trap

A 4.0% going-in cap on a property whose stabilized NOI implies a 6.5% return looks expensive on day one and cheap after the renovation lifts rents. The going-in cap rate captures the first part of the story and misses the second. For value-add deals, you need a multi-year cash flow model with renovation phasing — the going-in cap is almost beside the point.

The lease rollover ambush

An office building at a 7.5% in-place cap looks attractive until you notice 60% of the tenants roll in the next 24 months at 30% below-market rents. The 7.5% is a real number, but it expires when the leases do. The right metric is a stabilized cap on mark-to-market rents, computed in a per-tenant rollover model.

The cap rate ≠ yield confusion

Cap rate is an unlevered yield on price. Your actual yield as an equity investor depends on leverage, debt cost, capital reserves, and entry-exit cap rate spread. A 5% cap rate property with 65% LTV agency debt at 6% costs you money in year one — negative leverage — even though the asset itself yields 5%. Cap rate is a useful indicator, but it's not the return on equity.

How to Model It

A first-pass cap rate analysis fits on a single Excel sheet. Five sections, in this order:

• 1. Rent roll and other income. Pull from the seller's rent roll PDF (or, if you have access, their property-management system export). Build a per-unit table with current rent, market rent, lease expiration, and concession status. Sum to gross potential rent. Add other-income line items (parking, laundry, pet fees, RUBS) separately.

• 2. Vacancy and credit loss. Use the higher of in-place vacancy or submarket average. Add 50 bps for credit loss. If the property is in lease-up, model a curve to stabilization rather than a flat number.

• 3. Operating expenses by line item. Build a 12-month operating expense schedule from the T-12 (or T-3 if the property has recent ownership changes). Normalize for one-time items. Compare your normalized OpEx to the NCREIF expense ratios for the asset class — if you're 15% under, you've missed something.

• 4. NOI subtotal. EGI minus OpEx equals NOI. Keep capital reserves below the line.

• 5. Going-in cap rate. NOI divided by the all-in purchase price (price + acquisition costs + immediate-need CapEx). Compare to the submarket benchmark to test whether the deal is priced inside or outside market.

For multifamily core/core-plus, this is exactly what the Apers AQ-110 Pocket Model does in five minutes from eight inputs — rent roll, vacancy, OpEx ratio, growth rate, LTV, interest rate, exit cap, and purchase price. When the screen passes, the full AQ-111 Pro Forma extends the same logic into a 10-year monthly cash flow with unit-level rent rolls, bridge-to-perm debt, and IC-ready outputs. For ground-up development, where cap rate is a yield-on-cost target rather than a going-in basis, the DV-001 Ground-Up Development Pro Forma handles the construction draws, capitalized interest, lease-up assumptions, and stabilized exit cap.

From Cap Rate to a Full Pro Forma

Cap rate gets you through the first 30 seconds of a deal. Past that, every serious underwrite requires the full cash flow: revenue projections, operating expenses, debt structure, equity returns, exit assumptions, and sensitivity tables on the inputs that move the answer.

Apers ships AQ-110, the Multifamily Acquisition Pocket Model — a single-sheet model that runs the full going-in cap, exit cap, NOI build-up, levered IRR, equity multiple, and a 2×2 sensitivity table from eight inputs in minutes. You can build the underlying logic in Excel by following the worked example above; in Apers, you build it in minutes and iterate from there.

When you graduate past screening, the same logic carries into AQ-111, the full Multifamily Core/Core-Plus Pro Forma — 10-year monthly cash flow, unit-level rent rolls, bridge-to-perm debt modeling, and IC-ready outputs.

Related Articles

The cap rate pillar links into the broader valuation cluster on Apers Learn. Sibling deep-dives:

• IRR Calculator and Formula for Real Estate — what cap rate can't tell you, IRR can.

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