Finance & Economics · Real Estate & Mortgages · Investment Returns
Cap Rate Calculator
Calculates the capitalization rate of a real estate investment by dividing net operating income by the current market value of the property.
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Formula
NOI (Net Operating Income) is the annual income generated by the property after deducting all operating expenses but before mortgage payments and income taxes. Market Value is the current purchase price or appraised value of the property. The result is expressed as a percentage.
Source: Appraisal Institute, 'The Appraisal of Real Estate', 14th Edition. Standard income approach valuation methodology.
How it works
The cap rate is grounded in the income approach to real estate valuation. The core idea is straightforward: a property is worth what it earns. By dividing the annual net operating income (NOI) by the property's market value, you get a percentage that represents the unlevered yield on the asset — that is, the return you would earn if you purchased the property in cash with no mortgage. This makes cap rates inherently comparable across properties of different sizes, locations, and asset types, as long as the NOI is calculated consistently.
Net Operating Income is the cornerstone of the calculation. It starts with the potential gross rental income — the maximum rent if every unit were occupied all year. From this, you subtract a vacancy and credit loss allowance (typically 3–10% depending on market conditions and asset class) to arrive at Effective Gross Income (EGI). Operating expenses are then deducted from EGI to produce NOI. Operating expenses include property taxes, insurance, property management fees, maintenance and repairs, utilities paid by the landlord, and reserves for replacement. Critically, NOI excludes mortgage principal and interest payments, capital expenditures for major improvements, depreciation, and income taxes — these are financing and ownership decisions that vary by investor and should not obscure the property's intrinsic earning power.
Cap rates vary significantly by property type and geography. Class A multifamily properties in gateway cities like New York or San Francisco may trade at cap rates of 3–4%, reflecting high values and lower perceived risk. Industrial and logistics properties have compressed to similar levels in recent years due to e-commerce demand. Suburban strip retail or single-tenant net lease properties may trade between 5–7%. Class B/C apartments in secondary markets might yield 6–9%. A lower cap rate implies a higher price relative to income and generally signals a stronger, more liquid market; a higher cap rate implies greater risk or a less competitive market. Investors often use the cap rate as the discount rate in a direct capitalization model: Property Value = NOI ÷ Cap Rate, allowing them to back into a maximum acquisition price given a target return.
Worked example
Consider a 10-unit apartment building you are evaluating for acquisition. Each unit rents for $1,500 per month, producing a gross annual income of $180,000 (10 × $1,500 × 12). You apply a 5% vacancy rate to account for turnover and occasional vacancies: $180,000 × (1 − 0.05) = $171,000 Effective Gross Income.
Annual operating expenses break down as follows: property taxes $18,000, insurance $4,500, property management at 8% of EGI $13,680, maintenance and repairs $9,000, utilities $3,000, and capital reserves $6,000 — totaling $54,180 in operating expenses. NOI = $171,000 − $54,180 = $116,820.
The asking price for the property is $1,450,000. Cap Rate = $116,820 ÷ $1,450,000 = 0.0806 or 8.06%. Compared to the local market where similar multifamily properties trade at 7.0–7.5%, this property appears attractively priced. Alternatively, if you require a minimum 7.5% cap rate, the maximum price you should pay is $116,820 ÷ 0.075 = $1,557,600 — meaning the asking price offers a meaningful margin of safety against your return target.
Limitations & notes
The cap rate is a snapshot metric, not a comprehensive investment analysis tool. It does not account for financing structure, so two investors buying the same property — one with all cash, one with 70% leverage — will experience very different equity returns despite an identical cap rate. Always combine cap rate analysis with cash-on-cash return and internal rate of return (IRR) calculations when financing is involved. The accuracy of the cap rate depends entirely on the quality of the NOI figure; sellers often present pro forma NOI based on optimistic assumptions about future rents and minimal vacancies, so buyers should always underwrite using trailing 12-month actuals or conservative forward estimates. Cap rates also fail to capture appreciation potential, tenant credit quality, lease term length, or deferred maintenance — all of which can dramatically affect total return. In markets with very low cap rates (below 4%), small errors in NOI estimates can produce large swings in implied value. Finally, cap rates are most meaningful when comparing similar asset types in similar markets; comparing a 5% cap rate on a net-lease pharmacy to a 5% cap rate on a value-add apartment complex would be deeply misleading, as the risk profiles are entirely different.
Frequently asked questions
What is a good cap rate for a rental property?
There is no universally 'good' cap rate — it depends on the asset class, location, and your investment strategy. Generally, cap rates of 4–5% are common in high-demand urban multifamily markets, while 6–9% is more typical for secondary markets or higher-risk asset types. A higher cap rate implies higher return but also greater risk or lower appreciation potential. Most institutional investors target cap rates that exceed the 10-year Treasury yield by at least 150–250 basis points as a risk premium.
What expenses are excluded from NOI in a cap rate calculation?
NOI excludes mortgage interest and principal payments, income taxes, depreciation, and major capital expenditures (e.g., roof replacement or HVAC systems). These items are excluded because they reflect financing decisions and ownership structures rather than the property's underlying operating performance. Capital reserves for routine maintenance are sometimes included in operating expenses depending on the analyst's convention, so it's important to check this when comparing NOI figures from different sources.
How does the cap rate relate to property value?
The relationship is inverse: as cap rates rise, property values fall (for the same NOI), and as cap rates compress, property values rise. This makes the formula Property Value = NOI ÷ Cap Rate extremely useful for buyers. For example, if NOI is $100,000 and market cap rates are 5%, the implied value is $2,000,000. If cap rates rise to 6%, the implied value drops to $1,666,667 — a 17% decline in value with no change in income. This sensitivity is why rising interest rates tend to put downward pressure on real estate prices.
What is the difference between cap rate and cash-on-cash return?
Cap rate measures the unlevered return on a property as if purchased entirely in cash, while cash-on-cash return measures the actual cash return on the equity you invested after accounting for mortgage payments. If you finance 70% of a purchase with a mortgage, your cash-on-cash return will diverge significantly from the cap rate. In a low-interest-rate environment where mortgage rates are below the cap rate, leverage amplifies equity returns — a phenomenon called positive leverage. When mortgage rates exceed the cap rate, leverage destroys returns (negative leverage).
Can cap rates be used to value commercial real estate?
Yes — direct capitalization using the cap rate is one of the three primary approaches to commercial real estate appraisal alongside the sales comparison and cost approaches. An appraiser or investor derives the market cap rate from comparable sales (dividing their NOIs by sale prices), then applies that rate to the subject property's stabilized NOI to arrive at value. This method is most reliable for stabilized, income-producing properties with predictable cash flows. It is less appropriate for development sites, heavily value-add properties, or assets with significant lease-up risk, where a discounted cash flow (DCF) analysis is preferred.
Last updated: 2025-01-15 · Formula verified against primary sources.