Investors
Rental Property ROI Calculator
Run the numbers on any rental, cap rate, cash-on-cash return, monthly cash flow, and the 1% rule.
Purchase & Financing
Income & Expenses
Cap Rate
5.06%
NOI ÷ price
Cash-on-Cash
-3.32%
annual CF ÷ cash in
Monthly Cash Flow
-$310
after all costs
Cash Invested
$112,000
down + closing
Annual Cash Flow
Quick Checks
1% Rule ✗ Below
Rent of $3,200 vs. 1% target of $4,000/mo.
Gross Rent Multiplier
10.4×, lower is generally better.
Ready to find a cash-flowing rental?
Our team specializes in investment properties across South Florida's 8 counties.
Find Investment PropertiesEstimates for educational purposes only. Actual returns depend on financing, market conditions, and operating costs. Not investment or tax advice.
How the rental property ROI calculator works
This tool measures a rental four ways. Cap rate = net operating income / purchase price, where NOI is annual rent minus operating expenses (not the mortgage). Cash-on-cash = annual pre-tax cash flow / total cash invested. It also shows monthly cash flow and the 1% rule, which asks whether monthly rent is at least 1% of the price.
A $400,000 property renting for $3,200 a month brings $38,400 a year. Subtract $12,800 in taxes, insurance, and upkeep for a $25,600 NOI, a 6.4% cap rate. The 1% rule wants $4,000 a month, so $3,200 falls short, a common gap in South Florida's price-to-rent market.
Cap rate and cash-on-cash let you compare a Broward duplex against a St. Lucie single-family on equal footing, before insurance and HOA dues erode returns. South Florida rents rarely clear the 1% rule, so investors here lean on appreciation and careful expense math rather than assuming a listing cash-flows on day one.