Plenty of landlords know their rent roll but can't say whether a property is a strong performer or quietly bleeding. The difference is a handful of metrics that professional investors live by. Learn these six — NOI, cap rate, cash-on-cash return, gross yield, DSCR, and vacancy rate — and you can compare deals, spot underperformers, talk to lenders, and make decisions with numbers instead of hope. None require more than arithmetic.
- NOI measures the property; cash-on-cash measures your investment.
- Cap rate compares properties independent of financing.
- DSCR is what your lender cares about most.
- Every metric is only as good as the clean books behind it.
1. Net Operating Income (NOI)
The foundation. NOI is what the property earns from operations, before financing:
NOI = (Gross rental income + other income) − operating expenses
Operating expenses include property taxes, insurance, maintenance, management, and vacancy loss — but not your mortgage, capital improvements, or depreciation. Because it excludes financing, NOI lets you judge the asset itself and compare two properties on equal footing. It's also the input to cap rate and DSCR, so get it right.
2. Capitalization rate (cap rate)
Cap rate expresses NOI as a percentage of the property's value or price:
Cap rate = NOI ÷ property value
A $300,000 property with $21,000 NOI has a 7% cap rate. It's the quickest way to compare properties regardless of how they're financed. A "good" cap rate is relative — many investors see ~5–10% as typical — but it's market-dependent: lower cap rates are common in high-demand, appreciating areas, higher cap rates in higher-yield (often higher-risk) markets. Compare within the same market, not to a universal number.
3. Cash-on-cash return
Cap rate ignores your loan; cash-on-cash doesn't. It measures the return on the actual cash you put in:
Cash-on-cash = annual pre-tax cash flow ÷ total cash invested
Where cash flow = NOI − annual debt service, and cash invested = down payment + closing costs + upfront repairs. If you invested $70,000 and the property throws off $6,300/year after the mortgage, that's a 9% cash-on-cash return. This is the number that tells you how hard your money is working.
4. Gross yield & the gross rent multiplier
Quick back-of-envelope screens for comparing many properties fast:
- Gross yield = annual gross rent ÷ property price. A fast first filter before you dig into expenses.
- Gross rent multiplier (GRM) = price ÷ annual gross rent. Lower can indicate better value; useful for ranking a list of candidates.
Both ignore expenses, so never buy on them alone — but they're great for triaging a long list down to the few worth a full analysis.
5. Debt service coverage ratio (DSCR)
The metric your lender obsesses over:
DSCR = NOI ÷ annual debt service
A DSCR of 1.0 means the property exactly covers its mortgage; below 1.0 it can't. Lenders typically want a cushion (often 1.2–1.25+) so there's room for vacancies and surprises. Knowing your DSCR tells you how safe your financing is and how a rent change or a bad month affects your ability to cover debt.
6. Vacancy rate
The operational metric that quietly drives all the others:
Vacancy rate = vacant days (or units) ÷ total available
Because vacancy is unrecoverable income, a small change here swings NOI and every downstream metric. If your vacancy rate is creeping up, revisit pricing, listings, and retention — see reducing tenant turnover and setting the right rent.
Your metrics are only as good as your books
Every number here depends on accurate, categorized income and expenses. Guess at your expenses and your NOI — and everything built on it — is fiction. This is why clean rental accounting isn't bureaucracy; it's what makes these metrics trustworthy. When rent, expenses, and vacancy are tracked automatically in one place, your NOI, cap rate, cash flow, and vacancy rate are available on demand instead of reconstructed once a year. That real-time financial picture is exactly what Property Pilot 360 gives owners and managers.
Frequently asked questions
What is a good cap rate?
Market-dependent — many investors view ~5–10% as typical. Higher often means higher return but more risk; lower is common in high-demand areas. Compare within the same market.
How do I calculate NOI?
Gross income minus operating expenses (taxes, insurance, maintenance, management, vacancy) — excluding mortgage, capital improvements, and depreciation.
What is cash-on-cash return?
Annual pre-tax cash flow ÷ total cash invested — it accounts for financing, so it reflects the real return on your money.
The bottom line
You don't need a finance degree to invest well — you need six numbers and the clean books to compute them. Track NOI, cap rate, cash-on-cash, gross yield, DSCR, and vacancy rate, and you'll always know which properties to keep, fix, refinance, or sell. Property Pilot 360 keeps the underlying books accurate automatically, so the metrics are always a click away — see it in a demo.