Most people buy an Airbnb on a gut feeling and a free calculator. Four months later occupancy sits at 40% and they find out the deal never worked.

STR Profit Engine tells you the truth before you sign anything. Fill in the yellow cells. Get a verdict.

WHAT IT DOES
Enter your numbers on one tab — price, financing, nightly rate, occupancy and every operating cost. Seven more tabs calculate themselves.

You get a 12-month model with seasonality sliders, so you see the exact months you lose money instead of a flattering annual average. Your break-even occupancy — how far bookings can fall before the deal turns. A five-year projection with loan paydown and equity. After-tax cash flow with depreciation. And a one-line verdict: reject, weak, marginal, solid or strong.

Anything losing money turns red automatically.

THE 8 TABS
Start Here · Inputs · Monthly Model · Dashboard · 5-Year Projection · Scenarios · Deal Comparison · Tax & Refinance

Free web calculators make you sign up, keep your deal data on their servers, and give you a fixed set of outputs. This is a file you own and can edit. It also covers what they don’t: depreciation, after-tax cash flow, and refinance modelling.

WHAT IT CANNOT DO
One property, one loan. No partnership splits or 1031 exchanges. It does not connect to Airbnb — you supply your market data. It cannot see your local STR rules.

505 live formulas. Excel, Google Sheets and Numbers. Instant download & lifetime access.