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Rental Property Calculator

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Monthly Cash Flow
Annual Cash Flow
Cap Rate
Cash-on-Cash Return
Total ROI
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What Your Result Means

How This Calculator Works

You enter the purchase price, financing terms, expected monthly rent, and operating expenses (property tax, insurance, maintenance, vacancy). The tool computes a standard amortization mortgage payment, subtracts vacancy from gross rent, then deducts all monthly expenses to arrive at cash flow. Cap rate uses gross annual rent against price; cash-on-cash compares annual cash flow to your down payment.

Quick Questions

What vacancy rate should I use?

A 5% vacancy rate is a common conservative estimate for residential rentals, representing roughly 2–3 weeks of vacancy per year for tenant turnover. In hot rental markets you might use 3%; in weaker markets, 8–10%.

Does this include property management fees?

No. If you plan to hire a property manager, add their fee (typically 8–12% of collected rent) to your monthly expenses. Self-managing saves money but requires time and effort.

What's the 1% rule?

The 1% rule is a quick screening test: monthly rent should be at least 1% of the purchase price. A $200,000 property should rent for at least $2,000/month to have a chance at positive cash flow. It's a rough filter, not a guarantee.

How does depreciation affect real returns?

Residential rental property can be depreciated over 27.5 years for tax purposes, which creates a paper loss that offsets rental income. This tax benefit isn't modeled here but can significantly improve after-tax returns. Consult a tax professional.

Is cap rate or cash-on-cash more important?

Cap rate measures the property's intrinsic yield regardless of financing. Cash-on-cash measures your actual return on invested capital. If you're comparing properties, use cap rate. If you're evaluating your personal return, cash-on-cash is more relevant.

Sources

Method & review

MethodologyHow we calculate this Reviewed & Updated2026-04 Next review2027-04

Estimate only. Results reflect your inputs and standard formulas. Double-check important decisions independently.