One Ratio Rules Income Property
A duplex lists at $1.5 million. A fourplex lists at $900,000. Which is the better investment? Prices alone can’t tell you — but the capitalization rate can. Cap rate distills any income property to a single comparable number: the annual net income as a percentage of the property’s value. Same metric, any property, anywhere.
This free cap rate calculator works in all three directions: find the cap rate from income and value, find what a property is worth at a given cap rate, or find the income a price implies. The essential first screen for every rental deal.
Capitalization rate · 3 directions · income property
Please enter valid numbers above zero for the required fields.
Capitalization rate
Annual return on the property’s value
Higher cap rate = higher expected return and higher risk. Cap rates compress in hot markets (prices rise faster than rents) and expand when risk rises. Cap rate ignores financing — two buyers can see the same cap rate but very different cash-on-cash returns. Educational math, not investment advice.
How to Use This Calculator
- Pick what to find: cap rate, property value, or net operating income.
- Enter the two numbers you know. NOI = annual rent minus operating expenses (before mortgage payments).
- Click Calculate — get the answer plus monthly NOI and the full breakdown.
The Cap Rate Formulas
Value = NOI ÷ Cap Rate | NOI = Property Value × Cap Rate
Worked example
A property with $120,000 annual NOI valued at $1,500,000:
- Cap rate: $120,000 ÷ $1,500,000 = 8%
- Reverse: at a 6% market cap rate, $60,000 NOI implies a value of $60,000 ÷ 0.06 = $1,000,000
- Monthly NOI: $120,000 ÷ 12 = $10,000/month
Reading Cap Rates
| Cap rate | What it usually signals |
|---|---|
| 4 – 5% | Prime / low-risk markets; expensive prices, modest returns |
| 6 – 8% | Balanced risk-return; typical for solid rentals |
| 9%+ | Higher risk or upside: weaker markets, value-add plays |
Higher cap rate = higher expected return and higher risk. There’s no universally “good” number — only good relative to comparable properties in the same market.
Who This Calculator Is For
- Rental investors screening listings in seconds before deeper analysis.
- Agents explaining pricing logic to buyers and sellers.
- Homeowners wondering what their property would yield as a rental.
- Students learning the foundational metric of real estate finance.
Cap rate tips
- Verify the NOI: sellers quote optimistic rents and forget expenses — rebuild NOI yourself from real numbers.
- Compare within markets: an 8% cap in a declining town isn’t “better” than 5% in a growing city.
- Cap rate ignores financing: two buyers see the same cap rate but different cash-on-cash returns depending on their loans.
- It’s a snapshot: pair it with rent-growth and appreciation assumptions for the full picture.
How to Calculate NOI, Step by Step
Cap rate is only as honest as the NOI inside it, so build the income figure line by line. Take an 8-unit building renting at $1,000 per unit per month:
- Gross potential rent: 8 × $1,000 × 12 = $96,000 per year.
- Subtract vacancy: at 5%, that is $4,800, leaving effective rental income of $91,200.
- Subtract operating expenses: property taxes $12,000, insurance $6,000, maintenance $8,000, utilities $5,200, management $6,000 — a total of $37,200.
- NOI: $91,200 − $37,200 = $54,000.
- Cap rate: at an asking price of $675,000, $54,000 ÷ $675,000 = 8.0%.
Rebuild the seller’s NOI before you trust it. Brochures routinely inflate the number: no vacancy allowance at all, no management fee (even though a manager’s time is a real cost), no replacement reserves, and property taxes at the seller’s old assessment rather than the reassessed value you will actually pay. Each omission can flatter the quoted cap rate by half a point or more — recompute with your own expense lines instead.
What Cap Rate Does NOT Tell You
- Your financed return. Cap rate assumes an all-cash purchase. With a mortgage, your return is the cash-on-cash figure, which leverage can push far above — or below — the cap rate.
- Future growth. It is a snapshot of one year’s income. It says nothing about rising rents, a neighborhood improving, or a major lease expiring.
- Capital expenses. Roofs, HVAC systems and parking lots sit below the NOI line. A property can post a fine cap rate and still swallow its income in repairs.
- Tenant and lease quality. Ten years of lease from a national chain and month-to-month tenants can produce identical NOIs with very different risk.
- Your taxes. Income tax on the rent and the eventual capital gain are entirely outside the ratio.
The ratio is also highly sensitive to the rate itself. The same $54,000 NOI above is worth $771,429 at a 7% cap rate but only $600,000 at 9% — a $171,429 swing from two points of market sentiment. Use cap rate to compare similar properties in the same market, never as a complete verdict.
Frequently Asked Questions
What is cap rate in real estate?
The capitalization rate = net operating income ÷ property value, expressed as a percentage. It estimates the annual return an income property would generate if bought with cash, letting you compare properties regardless of price.
How do you calculate cap rate?
Divide annual NOI (rent minus operating expenses, before mortgage) by the property’s value and multiply by 100. Example: $120,000 ÷ $1,500,000 × 100 = 8%.
What is a good cap rate?
It depends on the market: 4–5% is typical in prime low-risk areas, 6–8% is a balanced middle, 9%+ usually signals higher risk or a value-add opportunity. Compare against similar properties in the same market, not national averages.
What is NOI?
Net operating income = annual rental income minus operating expenses (taxes, insurance, maintenance, management, vacancies) — before mortgage payments and income taxes. It measures what the property itself earns.
Does cap rate include the mortgage?
No — deliberately. Cap rate measures the property’s return, independent of how you finance it. Your personal cash-on-cash return will differ based on your down payment and loan terms.
How do you find property value from cap rate?
Value = NOI ÷ cap rate. If a property earns $60,000 NOI and similar properties trade at a 6% cap rate, its indicated value is $60,000 ÷ 0.06 = $1,000,000.
What is the difference between cap rate and cash-on-cash return?
Cap rate measures the property alone: NOI ÷ price, as if you paid all cash. Cash-on-cash return measures your money: the annual cash flow left after debt payments ÷ the cash you actually invested. The same building can show an 8% cap rate and a much higher — or lower — cash-on-cash return once a mortgage is involved.
Is a higher cap rate always better?
Not necessarily. A high cap rate often prices in higher risk — a weaker location, deferred maintenance or tenants who may not renew. A low cap rate on a stable, well-located property can be the safer buy. Compare cap rates only within the same market and property type, and check what the NOI leaves out.
Can a cap rate be negative?
Yes — when a property loses money operationally. If expenses exceed rental income, NOI is negative and so is the cap rate, as happens with vacant or heavily under-rented buildings. A negative cap rate is a warning sign rather than a bargain signal, unless you have a credible plan to turn the income around.
Final Thoughts
Cap rate won’t tell you everything — but it tells you the first thing, fast. Run every listing through it before you fall in love with the photos.
Investing in Property?
Compare renting vs. buying with our rent vs. buy calculator and check budgets with our home affordability calculator.