Tiny Toolkit

Cash Flow per Door Calculator

Enter the total monthly cash flow for a multi-unit property and the number of units to see exactly how much each door contributes. The $100/door/month benchmark is a widely used rule of thumb among rental investors to quickly screen deals. Annual per-door figures are shown alongside the portfolio totals so you can scale the math to any portfolio size.

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Frequently Asked Questions

What does 'per door' mean in real estate?
'Per door' means per individual unit in a multi-unit rental property. A 4-unit (fourplex) has 4 doors. It's a quick way to normalize cash flow performance across properties of different sizes.
What is a good cash flow per door?
$100–$200 per door per month is widely cited as the minimum threshold for a rental investment to be worthwhile. Below $100/door, the margin for unexpected expenses is too thin for most investors.
Should I use gross or net cash flow for this calculation?
Use net cash flow: total rent collected minus all expenses including mortgage, taxes, insurance, maintenance, management fees, and vacancy allowance. Using gross rent overstates the real per-door performance.
Can cash flow per door be negative?
Yes, and it's more common than many investors expect. Negative cash flow per door means the property is costing you money each month after expenses. Some investors accept this short-term in high-appreciation markets, but it's a meaningful risk.

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