Capitalization Rate & NOI for Rental Property
Updated October 2026
The capitalization rate (cap rate) is the single most important metric in real estate investing. It measures a property’s annual return as if you paid all cash — stripping out financing to reveal the property’s pure earning power. The formula is simple: Cap Rate = Net Operating Income (NOI) ÷ Property Value.1 A higher cap rate means a higher return relative to price, but often more risk; a lower cap rate usually signals a premium location with steadier, safer income. This calculator computes both your NOI and cap rate, plus the gross rent multiplier for quick comparisons.
Cap rate depends entirely on getting NOI right. NOI is your effective rental income minus operating expenses — but it deliberately excludes mortgage payments, depreciation, and income taxes, because those vary by buyer rather than by property.2
| Step | Example |
|---|---|
| Gross annual rent | $2,800/mo × 12 = $33,600 |
| Less vacancy (5%) | −$1,680 |
| Effective gross income | $31,920 |
| Less operating expenses | −$9,000 |
| Net Operating Income | $22,920 |
Operating expenses include property taxes, insurance, management, repairs, and maintenance — but not mortgage principal or interest.
There’s no universal "good" cap rate — it depends on the market and property type. As a rough guide, cap rates of 8%+ typically indicate strong cash flow (often in secondary markets or higher-risk areas), 5–8% represents a balanced return in most markets, and 3–5% is common in premium, high-demand metros where investors accept lower yields for appreciation potential and stability. A cap rate below 3% usually means you’re betting heavily on appreciation rather than income.3
Cap rate is powerful but incomplete. Because it ignores financing, it doesn’t reflect your actual cash-on-cash return when you use a mortgage — for that, use our Rental Property Calculator. It also ignores appreciation, tax benefits, and future rent growth. And it’s only as good as the NOI behind it: sellers often present optimistic "pro forma" NOI that understates expenses. Always verify expenses against actual records, and use a realistic vacancy rate for your market.4
One of the most useful insights cap rate provides is how it lets you value a property from its income. Because Value = NOI ÷ Cap Rate, you can estimate what a property is worth by dividing its NOI by the prevailing cap rate for similar properties in the area. If comparable buildings trade at a 6% cap rate and a property produces $30,000 in NOI, it’s worth roughly $500,000 ($30,000 ÷ 0.06). This is exactly how commercial appraisers and sophisticated investors value income property — and it means that increasing NOI (by raising rents or cutting expenses) directly increases the property’s value. A $1,000 annual NOI increase at a 6% cap rate adds about $16,700 to the property’s value.
Cap rates compress (fall) in markets where investors expect strong appreciation and rent growth, because buyers accept lower current income in exchange for future upside — think coastal metros where a 4% cap rate is normal. Cap rates expand (rise) in markets with flat population growth or higher perceived risk, where buyers demand more current income to compensate. This is why comparing cap rates only makes sense within the same market and property class. A 5% cap rate might be excellent in one city and mediocre in another. For the full investment picture including leverage and tax benefits, combine cap rate analysis with our Rental Property ROI Calculator and Mortgage Calculator.
→ Verify the seller’s expense numbers. Sellers often present optimistic "pro forma" NOI that understates expenses. Always confirm property taxes, insurance, and maintenance against actual records before trusting a cap rate.
→ Compare cap rates within the same market only. A 5% cap rate can be excellent in one city and mediocre in another. Cap rates reflect local appreciation expectations and risk, so they’re only meaningful between comparable properties in the same area.
→ Remember cap rate ignores your mortgage. Cap rate measures unleveraged return. To see your actual return with financing, run the numbers through our Rental Property Calculator for cash-on-cash return.
→ Use NOI to spot value-add opportunities. Because Value = NOI ÷ Cap Rate, raising rents or cutting expenses directly increases the property’s worth. A $1,000 NOI increase at a 6% cap rate adds about $16,700 in value.