Cap Rate Calculator: Formula, Examples, and How to Use It in 2026

What is a cap rate calculator?

A cap rate calculator is a tool that computes the capitalization rate of a rental property — the annual rate of return based on the property's net operating income (NOI) relative to its purchase price. Cap rate is the single most important metric for comparing real estate investment opportunities because it strips out financing variables and shows you a property's earning power on a level playing field.

The formula is straightforward: Cap Rate = (Net Operating Income / Property Value) x 100. But getting the inputs right is where most investors make mistakes. This guide walks through the formula step by step, provides real-world examples, and explains what constitutes a good cap rate for different property types in 2026.

The cap rate formula explained

Cap rate has three components. Understanding each one is critical for accurate calculations.

Net Operating Income (NOI)

Net operating income is your property's gross annual income minus all operating expenses — but excluding mortgage payments and income taxes. NOI represents the property's pure earning power before financing.

Operating expenses for rental properties include: property taxes, insurance, property management fees, maintenance and repairs, utilities (if owner-paid), vacancy allowance, HOA dues, and landscaping or snow removal.

Property value

Use the purchase price for pre-acquisition analysis, or the current market value for evaluating properties you already own. Appraisals, comparable sales, and tools like the Awning Airbnb calculator provide reliable value estimates.

Worked example

A 7.6% cap rate means the property generates $7.60 in net operating income for every $100 of property value each year — before mortgage payments.

What is a good cap rate in 2026?

A good cap rate depends on the property type, market, and your investment strategy. Here are 2026 benchmarks based on data from Airbnb market data and our management portfolio of 20,000+ properties:

For short-term rental properties specifically, cap rates should generally be 2-3 percentage points higher than long-term rental cap rates in the same market because STR investing involves more operational complexity and revenue variability. See our detailed Airbnb cap rate guide for market-specific benchmarks.

Cap rate vs. cash-on-cash return

Cap rate measures the return on the total property value, ignoring financing. Cash-on-cash return measures the return on the actual cash you invested (your down payment plus closing costs). Both are essential — cap rate for comparing properties, and cash-on-cash for evaluating whether a specific deal meets your personal return threshold with your financing terms.

A property with a 7% cap rate might deliver a 12% cash-on-cash return with favorable leverage, or a 4% cash-on-cash return with expensive financing. Always calculate both before making an investment decision. For more on evaluating returns, see our Airbnb data investment guide.

Common cap rate mistakes

1. Using peak-season revenue: STR income is seasonal. Always use annualized data from 12 months of comparable listings, not summer rates extrapolated to a full year.
2. Underestimating expenses: A realistic expense ratio for professionally managed STRs is 50-60% of gross revenue. New investors often forget management fees, platform fees, cleaning costs, and vacancy.
3. Ignoring regulatory risk: A property's cap rate drops to zero if the city bans short-term rentals. Research local STR regulations before investing.
4. Confusing cap rate with ROI: Cap rate does not include mortgage costs, capital expenditures, or tax benefits like depreciation deductions. It is one metric, not a complete return analysis.

How to use cap rate to find investment properties

Cap rate is most useful as a screening tool. Set a minimum cap rate threshold (e.g., 6%) and use it to filter properties during your search. Properties below your threshold need a compelling appreciation story or value-add opportunity to justify the lower current yield.

Use the Awning Airbnb calculator to estimate revenue for specific addresses, then run the cap rate calculation to compare opportunities. For a comprehensive market-level view, explore the top Airbnb markets dashboard and our guide to the best places to buy vacation rental property.

Frequently Asked Questions

How do I calculate cap rate?

Divide the property's annual net operating income (gross income minus operating expenses, excluding mortgage payments) by the property's purchase price or market value. Multiply by 100 to express as a percentage. For example: $26,600 NOI / $350,000 property value = 7.6% cap rate.

What is a good cap rate for rental property?

For long-term rentals, 5-8% is considered good in most markets in 2026. For short-term rentals, aim for 6-10% because STR investing carries more operational complexity. Cap rates below 4% typically require property appreciation to deliver acceptable total returns.

Does cap rate include mortgage payments?

No. Cap rate is calculated before financing costs. This is intentional — it lets you compare properties on a level playing field regardless of how they are financed. Use cash-on-cash return to evaluate how your specific financing terms affect your actual returns.

What expenses are included in NOI for cap rate?

NOI includes all operating expenses: property taxes, insurance, property management fees, maintenance and repairs, utilities, vacancy allowance, HOA dues, cleaning costs, and platform fees. NOI excludes mortgage principal and interest, income taxes, and capital expenditures (major improvements).

Is a higher cap rate always better?

Not necessarily. Very high cap rates (above 10-12%) often signal risk — inflated revenue projections, a declining market, deferred maintenance, or regulatory uncertainty. The best investments typically fall in the 6-10% range, where cash flow is strong and assumptions are verifiable.

How does cap rate differ for short-term vs long-term rentals?

Short-term rental cap rates should be 2-3 percentage points higher than long-term rental cap rates in the same market. STRs generate higher gross income but have higher operating expenses (cleaning, turnover, furnishing, management) and more revenue variability. A 7% LTR cap rate and a 9% STR cap rate in the same market may represent similar risk-adjusted returns.