Cash Flow per Door Calculator

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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