Cap Rate Calculator

What is Cap Rate (Capitalization Rate)?

Cap rate is the rate of return on a real estate investment property based on the income that property generates. That's it. Nothing more complicated than that.

It's expressed as a percentage. You'll hear investors throw around numbers like "that's a 7 cap" or "I won't touch anything under 5." They're talking about cap rate.

Cap rate represents the yield of a property over the duration of a year. Think of it like this. If you bought a property with all cash, no mortgage, what percentage would you earn back annually from the rental income? That's your cap rate.

It strips away the financing. Strips away the speculation. Just tells you what the property itself produces relative to what it costs.

Why Cap Rate Matters for Real Estate Investors

Cap rate lets you compare properties quickly. Doesn't matter if one's a $200,000 duplex and another's a $2 million apartment building. The percentages tell you which one works harder for each dollar invested.

It's also a risk indicator. Lower cap rates typically show up in stable, desirable markets. Think downtown areas in major cities. High demand. Less volatility. But less return too.

Higher cap rates suggest higher risk. Maybe it's a rougher neighborhood. Maybe the market's less proven. More reward potential, but more ways things can go sideways.

Here's what I actually use it for. Making decisions without relying on gut feelings or speculation. Is the asking price justified based on what this property actually earns? Cap rate answers that directly.

Some investors chase appreciation. Hope the property goes up in value. That's fine. But cap rate focuses on what's real right now. What the property produces today.

How to Calculate Cap Rate: Formula & Components

The formula is simple enough that you can do it in your head once you know the numbers.

Two components. That's all. Your NOI divided by what the property costs. The result tells you your annual return percentage.

Let me break down each piece because getting these numbers right matters more than the formula itself.

Cap Rate Formula Breakdown

Written out fully:

The multiplication by 100 just converts the decimal to a percentage. A result of 0.07 becomes 7%.

One thing that trips people up. Both numbers need to be from the same time period. Annual NOI divided by current value. Don't mix a monthly income figure with a property price. Don't use last year's NOI with this year's market value if the property's changed significantly.

Consistency matters here.

Understanding Net Operating Income (NOI)

NOI is the total income generated by the property minus all operating expenses. But not mortgage payments. That's the key distinction.

Here's how you calculate it:

Operating expenses include:

• Property taxes
• Insurance
• Maintenance and repairs
• Property management fees
• Utilities (if you're paying them, not the tenant)
• HOA fees where applicable

What's NOT included in NOI:

• Mortgage payments
• Depreciation
• Capital expenditures (big improvements like a new roof)

People mess this up constantly. They subtract their mortgage payment and wonder why their cap rate looks different from what everyone else is getting. Mortgage isn't an operating expense. It's a financing cost. Different category entirely.

NOI measures the property's operating performance. Independent of how you financed it.

Determining Property Value for Cap Rate

Property value depends on your situation.

For properties you're considering buying, use the purchase price. Or the asking price if you're evaluating a listing.

For existing properties you're analyzing, use current market value. What would it actually sell for today?

For properties you already own, use recent appraisal or comparable sales data. What similar properties in your area have sold for recently.

Here's the thing about older properties. If you bought something ten years ago for $300,000 and it's now worth $500,000, using your original purchase price gives you a misleading cap rate. You'd get a higher percentage that makes the investment look better than it actually performs relative to current values.

Current market value shows what return you're earning on what the property's worth today. More useful for portfolio decisions.

How to Use a Cap Rate Calculator

The calculator does the math. You need accurate inputs. Garbage in, garbage out applies here.

Step 1: Enter Property Value

Input the property's current market value or purchase price. Pretty straightforward.

If you're evaluating a property for sale, use the asking price. You can always recalculate with your actual offer amount later.

If you own the property already, use a recent appraisal. Or look at comparable sales in your area. What have similar properties sold for in the past six months?

Don't guess here. The whole calculation depends on this number being reasonable.

Step 2: Calculate Your Net Operating Income

Start with annual gross rental income. Monthly rent times 12. If you're getting $2,000 per month, that's $24,000 annually.

Then subtract all annual operating expenses.

Run through this checklist:

• Property taxes (check your tax assessment)
• Insurance (annual premium)
• Maintenance (estimate 1-1.5% of property value per year)
• Property management fees (typically 8-12% of rental income if you're paying someone)
• Utilities you cover
• Repairs budget
• Vacancy allowance (typically 5-10% of rental income)

Add those up. Subtract from gross rental income. What's left is your NOI.

Don't skip the vacancy allowance. Even good properties sit empty sometimes between tenants. Pretending you'll have 100% occupancy forever makes your numbers look better than reality.

Step 3: Add Vacancy Rate & Operating Expenses (Advanced)

Some calculators let you input vacancy rate as a percentage rather than a dollar amount. Same idea. You're accounting for time the property sits unoccupied.

Vacancy rates typically range 5-10% depending on your market. Hot rental markets with low inventory might see 3-5%. Slower markets or difficult properties might hit 10% or higher.

Operating expense ratios vary by property type. Residential properties usually run 35-50% of gross rental income. Commercial properties tend higher, 40-60%.

These ratios help when you don't have exact expense figures. Useful for quick evaluations before you dig into detailed numbers.

Step 4: Get Your Cap Rate Result

The calculator divides your NOI by property value and displays the cap rate as a percentage. Instantly.

This number represents your expected annual return on investment before financing costs. Before your mortgage. Before depreciation tax benefits. Just raw property performance.

A 6% cap rate means you'd earn roughly 6% annually on an all-cash purchase. A 10% cap rate means 10%.

Now you can compare this against other properties. Against your minimum return requirements. Against market averages for similar properties.

How often should I calculate cap rate?

At purchase evaluation, obviously. That's the primary use case.

But also annually when reviewing your portfolio. Properties change. Rents go up. Expenses creep higher. Your actual cap rate shifts over time.

Calculate again when considering a sale. What's the cap rate at current market value? That tells you what a buyer might pay.

And when market conditions change significantly. Interest rate shifts. Major changes in your local rental market. These affect what cap rates look like across your portfolio.

For properties you're evaluating to buy, calculate immediately when reviewing deals. It's your first filter.

Can I use cap rate for single-family homes?

Yes. Though it's more commonly used for multi-family and commercial properties where income is the primary driver.

Single-family cap rates work fine for comparing investment properties against each other. Which rental house performs better per dollar invested?

But here's the thing about residential properties. A lot of the value comes from appreciation rather than income. People buy houses. They want that specific house in that specific neighborhood. The income math isn't everything.

Consider using cap rate alongside gross rent multiplier (GRM) and cash-on-cash return for single-family analysis. Gives you a more complete picture.

What's the difference between cap rate and interest rate?

Cap rate measures property return. What does the property generate relative to its value? Based on NOI and property price.

Interest rate is borrowing cost. What does the bank charge you to lend money for the purchase?

Related but different. They're connected in real-world investing though.

Rising interest rates often lead to rising cap rates. Why? Investors need higher returns to compensate for higher borrowing costs. If your mortgage costs more, the property needs to produce more for the investment to make sense.

When rates drop, cap rates often compress. Investors accept lower returns because borrowing is cheap.

Is a higher or lower cap rate better?

Depends entirely on what you're trying to do.

Higher cap rate means higher returns but higher risk. Something's causing that higher cap rate. Maybe the neighborhood is uncertain. Maybe the tenant base is unstable. Maybe the market is unproven. Better for aggressive investors who want cash flow and can stomach volatility.

Lower cap rate means lower risk. Stable markets. Reliable tenants. Proven areas. Also means lower returns. Better for conservative investors prioritizing stability and long-term appreciation over immediate income.

Neither is universally better. I know investors who only buy 8+ cap properties. I know others who won't touch anything over 5. Both approaches work depending on goals and risk tolerance.

What's your strategy? That determines which cap rate makes sense for you.

Do cap rates include mortgage payments?

No. Cap rate is calculated on an unlevered basis. Assumes all-cash purchase.

This confuses people. "My mortgage payment is $1,500 a month but the cap rate says I should be earning..." Stop. Cap rate doesn't know about your mortgage. Doesn't care.

It measures property operating performance independent of financing. How does this property perform on its own, regardless of how you paid for it?

Want to see your returns including your mortgage? Calculate cash-on-cash return instead. That shows what you actually earn on the cash you put in after debt service.

Cap rate is for comparing properties objectively. Cash-on-cash is for understanding your personal return after financing.

How do I find average cap rates for my area?

Several sources actually have this data.

Commercial real estate brokers publish market reports. CBRE, JLL, Marcus & Millichap all release regular cap rate surveys broken down by property type and market.

Real estate investment platforms and databases track transaction data. Sometimes behind paywalls, sometimes not.

Local commercial real estate associations compile market data for their members. Worth checking if you're active in a specific market.

Recent comparable sales data tells you what buyers actually paid relative to property income. Work backwards from sale prices and rent rolls.

Real estate appraisers use cap rate data constantly. They can often tell you typical ranges for your area and property type.

Ask around too. Other investors in your market usually have opinions about what cap rates make sense locally. Some of those opinions are even based on actual data.