Rental Property & Cap Rate Calculator

Net Operating Income (NOI) is the income a property generates after all operating expenses but before mortgage payments, capital expenditures, and income taxes. It's the single most important number in rental property analysis because it represents the property's true earning power independent of financing decisions.

The formula:

NOI = Effective Gross Income − Operating Expenses

What's included in NOI:

• Gross rental income — Total rent if every unit were occupied and paying full price for the entire year.
• Minus vacancy and credit losses — Realistic deduction for vacant periods and tenants who don't pay. A typical assumption is 5-10% of gross rent.
• Minus operating expenses — Property taxes, insurance, maintenance, property management fees, landscaping, utilities paid by the owner, and other recurring costs of running the property.

What's NOT included in NOI:

• Mortgage payments — Debt service is a financing decision, not an operating expense. This is intentional: NOI lets you evaluate the property on its own merits before layering on leverage.
• Capital expenditures (CapEx) — Major repairs like a new roof or HVAC system are excluded from NOI. Some investors subtract a CapEx reserve (e.g., 5-10% of rent) for a more conservative analysis.
• Income taxes — Your personal tax situation varies; NOI is a pre-tax metric.
• Depreciation — This is a non-cash accounting expense. Real estate investors love depreciation for tax purposes, but it doesn't affect actual cash flow from operations.

A common mistake is inflating NOI by underestimating vacancy or forgetting expenses like property management (even if you self-manage, your time has value). Conservative NOI estimates lead to better investment decisions. If the deal only works with zero vacancy and below-market expense assumptions, it's probably not a good deal.

Cash-on-cash return measures the annual pre-tax cash flow you actually receive relative to the cash you actually invested. Unlike cap rate, it accounts for mortgage financing, making it a much more relevant metric for leveraged investors.

The formula:

Cash-on-Cash Return = Annual Cash Flow / Total Cash Invested × 100

Where Annual Cash Flow is NOI minus annual mortgage payments, and Total Cash Invested is your down payment plus closing costs.

Cap rate vs. cash-on-cash — the key difference:

• Cap rate ignores leverage — It measures the property's return as if you paid all cash. A $300,000 property with $21,000 NOI has a 7% cap rate whether you put 20% down or bought it outright.
• Cash-on-cash reflects your actual investment — If you put $60,000 down on that same property and your annual cash flow after the mortgage is $5,400, your cash-on-cash return is 9%. Leverage amplified your return on invested capital.
• Leverage cuts both ways — If the mortgage payment is higher than the NOI (negative cash flow), your cash-on-cash return is negative even though the cap rate is positive. Many investors in expensive markets accept negative cash flow betting on appreciation — cash-on-cash makes this trade-off explicit.

When to use each metric:

• Use cap rate to compare properties and markets, screen deals quickly, and evaluate the asset independent of financing.
• Use cash-on-cash return to evaluate your actual expected return given your specific financing terms, down payment, and expenses. This is the number that tells you whether the deal makes sense for you personally.

Smart real estate investors look at both. A property with a mediocre cap rate can have an excellent cash-on-cash return with favorable financing, and vice versa. Neither metric alone tells the full story.

The 1% rule is a quick screening heuristic used by rental property investors. It states that monthly rent should be at least 1% of the purchase price. A $200,000 property should rent for at least $2,000/month; a $500,000 property should rent for at least $5,000/month.

Why the 1% rule exists:

• Quick deal screening — In markets with hundreds of listings, the 1% rule lets you immediately eliminate properties where the rent-to-price ratio is too low to generate positive cash flow after expenses and mortgage payments.
• Rough proxy for cash flow — Properties that meet the 1% rule tend (but are not guaranteed) to produce positive cash flow with conventional 20-25% down financing. The math roughly works out because operating expenses typically run 40-50% of gross rent.

Limitations of the 1% rule:

• Market-dependent — In expensive coastal cities (San Francisco, New York, Los Angeles), almost nothing meets the 1% rule. In Midwestern markets, 1.5-2% is common. The rule is more relevant as a relative benchmark within a market than as an absolute standard.
• Ignores property condition — A cheap property in poor condition might meet the 1% rule while requiring massive capital expenditures. A well-maintained property at 0.8% might be a better long-term investment.
• Doesn't account for appreciation — In high-growth markets, investors accept lower rent-to-price ratios because property values (and rents) are rising. The 1% rule ignores this entirely.
• Not a substitute for real analysis — The 1% rule is a filter, not a decision tool. Every property that passes the 1% rule still needs full NOI, cap rate, and cash-on-cash analysis before you buy.

Think of the 1% rule as a first-pass filter. If a property is at 0.4% (common in premium markets), you know you're relying heavily on appreciation. If it's at 1.2%, cash flow is likely strong. But always run the full numbers — this calculator does that for you in seconds.

There is no single "good" cap rate — it depends entirely on the market, property type, condition, and your investment strategy. That said, here are useful benchmarks by property category and location to help calibrate your expectations.

Cap rate ranges by market type:

• Gateway cities (NYC, SF, LA, Boston) — 3-5% cap rates are common. Investors accept low yields because these markets offer strong appreciation potential, high liquidity, and lower perceived risk. Cash flow is often negative.
• Secondary markets (Nashville, Raleigh, Austin, Denver) — 5-7% cap rates are typical. These markets balance cash flow with growth, attracting a mix of cash flow and appreciation investors.
• Tertiary and Midwest markets (Indianapolis, Cleveland, Memphis, Kansas City) — 7-10%+ cap rates are achievable. Higher cash flow, but slower appreciation and potentially higher management headaches and tenant turnover.

Cap rate ranges by property type:

• Single-family rentals — Generally 4-8%, depending on market. Lower cap rates because of resale liquidity and broader buyer pool.
• Small multifamily (2-4 units) — Often 5-9%. Slightly higher than SFR because of the management complexity but also better cash flow per dollar invested.
• Larger apartments (5+ units) — Commercial valuation methods apply; cap rates vary widely (4-10%) based on class, condition, and market.

The relationship between cap rate and risk: Think of cap rate like a bond yield. Higher yields compensate for higher risk. A 10% cap rate property might have deferred maintenance, a rough neighborhood, or high tenant turnover. A 4% cap rate property in a premium location may appreciate steadily with reliable tenants. Neither is inherently better — it depends on your goals, risk tolerance, and whether you prioritize cash flow or wealth building.

The best approach is to compare cap rates within the same market and property class. If similar properties in a neighborhood trade at 6% and you find one at 8%, it could be a deal — or it could signal problems you haven't discovered yet. Always dig into the why.

Cap rate and discounted cash flow (DCF) valuation are more closely related than most investors realize. In fact, cap rate is a simplified version of a DCF. Once you understand this connection, you'll see why sophisticated real estate investors use DCF models instead of (or in addition to) simple cap rate analysis.

The mathematical connection:

Property Value = NOI / Cap Rate

This is the same formula as valuing a perpetuity in finance: Value = Cash Flow / Discount Rate. When you use a cap rate to value a property, you're implicitly assuming that NOI stays constant forever and that the cap rate is the appropriate discount rate. That's a massive simplification.

Where cap rate analysis falls short:

• Rents change — In growing markets, rents increase 3-5% annually. Cap rate analysis uses today's NOI and ignores this growth. A DCF model projects rent increases year by year.
• Expenses escalate differently — Property taxes might rise 2% per year while insurance jumps 8%. A DCF model handles each line item independently.
• Capital expenditures are lumpy — A new roof in year 5 and a kitchen remodel in year 8 dramatically affect returns. Cap rate analysis has no way to capture these.
• Sale timing and price matter — Most investors sell after 5-15 years. The exit cap rate (and therefore sale price) significantly impacts total return. A DCF model explicitly models the exit.

When to use each approach:

• Use cap rate for quick comparisons, initial screening, and market-level analysis.
• Use a DCF model for final investment decisions, complex deals, value-add strategies, and any situation where future cash flows differ significantly from current ones.

The cap rate gives you a ballpark. The DCF model gives you the answer. If you're investing six or seven figures into a property, you owe it to yourself to build the full model.

Unleveraged return (also called "unlevered" or "all-cash" return) is the return on the total property value, ignoring debt. Leveraged return is the return on the cash you personally invested, after accounting for mortgage payments. Understanding this distinction is critical because leverage dramatically changes the risk-reward profile of any real estate investment.

How leverage amplifies returns:

Suppose you buy a $300,000 property that generates $21,000 in NOI (a 7% cap rate). If you pay all cash, your return is 7%. Simple.

Now suppose you put 25% down ($75,000) and finance the rest at 5.5%. Your annual mortgage payment is about $15,300. Your cash flow is $21,000 − $15,300 = $5,700. Your cash-on-cash return is $5,700 / $75,000 = 7.6%. Leverage boosted your return from 7% to 7.6%.

But wait — it gets more interesting with appreciation: If the property appreciates 3% ($9,000), your total return (cash flow + appreciation) on a $75,000 investment is ($5,700 + $9,000) / $75,000 = 19.6%. On an all-cash basis, it would have been ($21,000 + $9,000) / $300,000 = 10%. Leverage nearly doubled your total return.

The downside of leverage:

• Amplifies losses too — If the property loses value, you still owe the mortgage. A 10% decline on a 75% LTV property means a 40% loss on your equity.
• Cash flow risk — Higher leverage means higher mortgage payments, which increases the chance of negative cash flow during vacancies or unexpected repairs.
• Interest rate sensitivity — If you have a variable rate or need to refinance, rising rates can turn a profitable deal into a money pit.
• Forced selling risk — If cash flow goes negative and you can't cover the mortgage, you may be forced to sell at a bad time.

The optimal approach: Most successful real estate investors use moderate leverage (60-75% LTV) to enhance returns while maintaining a cash flow buffer. The cap rate tells you the unleveraged return; the cash-on-cash return tells you the leveraged return. Compare both to understand how much of your expected return comes from leverage versus the property's fundamentals.

Cap rate is a powerful quick-screening tool, but it has blind spots that can lead to bad investment decisions if you rely on it exclusively. Understanding when cap rate analysis breaks down will make you a better investor.

Situations where cap rate misleads:

• Value-add properties — If a property has below-market rents, high vacancy, or deferred maintenance, the current NOI (and therefore cap rate) understates the property's potential. Savvy investors look at the "stabilized cap rate" after planned improvements, not the going-in cap rate.
• New construction or lease-up — A building that's 40% occupied has a terrible cap rate today, but might be a great investment once fully leased. Cap rate is meaningless during the lease-up period.
• Short-term lease risk — A property where major leases expire in 1-2 years might show a great cap rate based on current rents that won't be renewed at the same level. Cap rate assumes steady-state income.
• Different expense structures — Comparing cap rates across properties with different expense profiles (e.g., NNN leases vs. gross leases, or new vs. old buildings) is misleading. A 6% cap rate NNN property with no landlord expenses may be better than an 8% cap rate gross lease property where you pay everything.
• Appreciation-driven markets — In markets where investors primarily buy for price appreciation (e.g., coastal California), cap rates are compressed to 3-4%. Judging these investments solely on cap rate ignores the primary return driver.
• Properties with significant CapEx needs — A building that needs a $50,000 roof next year will have the same cap rate as an identical building with a brand-new roof. Cap rate doesn't account for deferred maintenance or upcoming capital expenditures.

What to use instead: For any deal beyond a simple screening, build a proforma cash flow model that projects income, expenses, CapEx, and sale proceeds year by year. This is essentially a DCF model adapted for real estate. It captures everything cap rate misses: rent growth, expense escalation, capital improvements, financing terms, and exit timing.

Cap rate gets you in the door. The proforma model closes the deal (or walks you away from it). Never skip the second step on a property you're seriously considering.