Every rental calculation stands on one number: the rent. Guess it high and every downstream number lies with a straight face. This estimator builds the rent from comparable rentals you enter — and, for 13 Texas markets, checks it against the Section 8 payment standard from HUD data when that data loads. If the data is not there, the tool says so and invents nothing.
Step 1. Find three comparable rentals — actually rented or actively listed homes like the subject: same area, similar size, beds, and condition.
Step 2. Enter each as Comparable Rental 1–3. Leave a slot at 0 if you only have two; one comp is an anecdote, not an estimate.
Step 3. Enter the Property Price to run the two checks — gross rent multiplier and the 1% rule screen.
Step 4. Pick your Texas market and bedroom count in the Section 8 panel to compare your estimate with the payment standard (shown only when the HUD dataset is loaded — otherwise the tool says so plainly).
Step 5. Carry the Estimated Rent into the Rental Cash Flow Calculator — that is where it earns its keep.
Estimated Rent = the average of the comparable rents you enter (slots left at 0 are excluded). The Estimate Band = Estimated Rent × (1 ± Band%) from Advanced — quote the band, underwrite to the middle, and never present the top of the band as the rent. An average of true comparables beats a portal's algorithmic guess because you chose the comps and can defend them.
Gross Rent Multiplier = Price ÷ (Estimated Rent × 12) — how many years of gross rent the price represents. 1% Rule Check = Estimated Rent ÷ Price × 100 — at 1.00% the deal passes the classic first screen; below it, cash flow has to be proven in the full calculator, not assumed either way.
The Section 8 panel reads HUD FY2027 SAFMR payment-standard data for 13 Texas markets from our own dataset. Housing authorities set their payment standard between 90% and 110% of FMR, so the standard is a ceiling reference, not a promised rent.
Payment standards, utility allowances, and inspections — the full picture.
Put the rent estimate to work in a full underwrite.
What the quick screens get right and where they mislead.
Because an invented number in a professional-looking box is worse than no number. Where we own verified data — the Section 8 payment standards — the tool loads it and labels its source. For open-market rent, your comparable rentals are the honest source, and the tool does the averaging and the checks.
Three is the working standard. Two will compute; one is an anecdote. More than three? Enter the three closest to the subject — proximity and similarity beat volume.
It can happen — the standard is set from area-wide data, not your street. Treat the gap as a question to verify with the housing authority, not as rent you can bank.
Actual rented homes are stronger evidence. Active listings work when rented comps are scarce, but a listing is an asking price; discount your confidence accordingly.