70% Rule Calculator
The classic flipper's screen: 70% of ARV minus rehab equals your maximum purchase price.
The ZIP includes the tool, instructions, license and example project.Maximum purchase price
- ARV
- Percentage
- Rehab
| ARV × percentage | $140,000 |
| − Rehab cost | −$35,000 |
| Max offer | $105,000 |
- One HTML file — double-click to open in Chrome, Edge, Firefox or Safari. No install.
- Works fully offline. No account, no subscription, nothing sent anywhere.
- Bilingual — switch English / Spanish with one click.
- Save unlimited scenarios (one property each) and compare them side by side.
- Save / Open your work as a file you own — Documents, Dropbox, USB.
- Clean one-page Print / PDF report.
- Instructions in English and Spanish, license and example file included.
HOW THE 70% RULE WORKS
The 70% rule says a flipper should pay no more than 70% of a property's After-Repair Value minus the rehab cost. The 30% gap is meant to absorb holding costs, closing and selling costs, and your profit. It's a fast back-of-the-envelope screen — great for killing bad deals quickly — but it's not a substitute for a full max bid that prices in title work, contingency and your actual minimum margin. Use it to filter, then run the real numbers on what survives.
Read the full max bid guide →CRIM Property Tax Estimator
Estimate the annual CRIM contribución from the assessed (1957) value, exemption and your municipality's rate — before you buy, bid or sign.
Max Bid Calculator
The most you can bid and still hit your minimum profit. Write it down before the auction — never bid a dollar past it.
Fix & Flip Calculator
Net profit and ROI from purchase, rehab, holding, closing, ARV and selling costs — the costs beginners forget, included.
BRRRR Calculator
How much cash you pull back out at the refinance, and whether the property still cash-flows after.