Rental Property (Cash Flow) Calculator
Estimate rental cash flow and NOI using vacancy, operating expenses, reserves, and financing. Great for quickly screening a deal before you build a full pro forma.
Inputs
Results
- Effective rent (after vacancy): $1,995
- Operating expenses (incl. PM): $860
- NOI: $1,135
- Mortgage: $1,279
- Cash flow: -$144
Tip: Add closing costs, rent growth, and appreciation later for a full pro forma.
How to Use This Rental Property Calculator (Mini Guide)
This is a quick underwriting pass to estimate cash flow and NOI using vacancy, reserves, and operating expense assumptions — so you don’t buy “paper cash flow.”
What this calculator measures
It estimates: monthly cash flow, NOI (income after operating expenses), and simplified returns.
It’s meant to answer: “Does this deal survive real expenses and still cash flow?”
Inputs that matter most (verify these first)
Market rent (not seller rent): validate with comps.
Vacancy: even great rentals go vacant — 0% is unrealistic.
Taxes + insurance: often change after purchase and vary by location.
Reserves (maintenance/CapEx): prevents ‘cash flow’ disappearing after a roof/HVAC/turnover.
3-minute underwriting workflow
Enter purchase price + financing terms.
Enter market rent + realistic vacancy.
Enter taxes/insurance (or start with defaults, then refine).
Keep reserves non-zero unless you have strong documentation that it’s truly turnkey.
How to interpret the output
If cash flow is barely positive, one repair can flip the deal negative.
NOI helps compare deals across markets. Cash flow tells you if the deal pays you monthly after debt.
For accuracy, treat rehab, closing costs, and initial reserves as part of your cash invested.
Next steps
If it fails: don’t force it — price is likely too high or rent is overstated.
If it passes: stress test vacancy and expenses, then build a fuller 5–10 year model.
Try it with local assumptions
Pick a city: