Cap Rate Calculator Formula
Understand the math behind the cap rate calculator. Each variable explained with a worked example.
Formulas Used
Capitalization Rate
cap_rate = (net_operating_income / property_value) * 100Implied Value at 8% Cap
implied_value_at_8 = net_operating_income / 0.08Implied Value at 6% Cap
implied_value_at_6 = net_operating_income / 0.06Variables
| Variable | Description | Default |
|---|---|---|
net_operating_income | Net Operating Income (NOI)(USD) | 36000 |
property_value | Property Market Value(USD) | 450000 |
How It Works
Understanding the Capitalization Rate
The cap rate measures the expected rate of return on a real estate investment based on its income-producing potential.
Formula
Cap Rate = (Net Operating Income / Property Value) x 100
Interpreting Results
Worked Example
A rental property generates $36,000 per year in net operating income and is valued at $450,000.
- 01Identify the NOI: $36,000 per year
- 02Identify the market value: $450,000
- 03Cap Rate = $36,000 / $450,000 = 0.08
- 04Cap Rate = 8.00%
- 05At an 8% cap rate, implied value = $36,000 / 0.08 = $450,000
- 06At a 6% cap rate, implied value = $36,000 / 0.06 = $600,000
When to Use This Formula
- Quickly comparing the return potential of two or more investment properties in different markets without factoring in financing.
- Estimating the market value of a commercial property when you know its net operating income and the prevailing cap rate for the area.
- Screening properties during the initial search phase to filter out deals that don't meet a minimum return threshold.
- Assessing whether a property's asking price is reasonable relative to its income — a cap rate significantly below market averages may signal overpricing.
- Communicating investment returns to partners or lenders in the standard metric they expect for commercial real estate.
Common Mistakes to Avoid
- Using gross rental income instead of net operating income — NOI must subtract operating expenses like property taxes, insurance, maintenance, and management fees, but not mortgage payments.
- Including mortgage payments or debt service in the NOI calculation — cap rate is an unlevered return metric that intentionally excludes financing costs so properties can be compared regardless of how they are financed.
- Applying cap rate analysis to single-family homes or fix-and-flip properties — cap rate is designed for income-producing properties held for cash flow, not for appreciation-driven strategies.
- Assuming a higher cap rate is always better — a very high cap rate often signals higher risk, such as a declining neighborhood, deferred maintenance, or unstable tenants.
Frequently Asked Questions
What is a good cap rate for real estate?
A good cap rate depends on the market and property type. Generally, 5-7% is considered average for residential, while commercial properties may range from 6-12%. Higher cap rates mean higher returns but often more risk.
Does cap rate include mortgage payments?
No. Cap rate uses net operating income before debt service. It measures property performance independent of financing, making it useful for comparing properties regardless of how they are financed.
How does cap rate relate to property value?
Cap rate and property value are inversely related. When cap rates compress (go lower), property values rise for the same NOI. When cap rates expand (go higher), property values decrease.
Ready to run the numbers?
Open Cap Rate Calculator