About

Landlord Math is for people buying one house or a duplex to rent — not a 200-door office.

Most “cash flow” numbers skip vacancy, capex, and the work of owning the place. This site puts those costs in the open before you offer, then points you at the operating work after you close.

The calculator is free and runs in your browser. Optional paid files exist if you want the same math offline or state-specific checklists. Nothing here is financial, tax, or legal advice. Use a real tax bill, a landlord insurance quote, and the statute for your state.