Every flip we lost money on had a spreadsheet.

The first flip that lost me money had a 22-row spreadsheet. Purchase. Rehab. ARV. It said $32,000 in profit. Nine months and $11,000 later, I closed at break-even.

What the spreadsheet didn't have was interest on 8 months instead of 4. Property tax on ARV, not purchase. Two draws that came late. An insurance quote that tripled after inspection. Selling agent commission that was 6, not 5. Closing costs the buyer negotiated onto my side.

Every one of those was on me. But every one of those was also predictable — the second I stopped underwriting to what I hoped and started underwriting to what actually happens on flips.

That's what FlipRuns is. Twelve inputs, sixty seconds, every number that decides whether a fix & flip is real. Built by working flippers, for working flippers.

Start with the fix and flip calculator to test a deal end to end, then check your ceiling with the 70% rule calculator and price the loan in the hard money loan calculator. If you want local numbers instead of national averages, every one of our 20 US flip markets has its own pre-filled page — start with Columbus, OH or Dallas, TX.

Saving deals, branded PDF reports, and the pipeline board live in Pro membership, and we publish new underwriting write-ups three times a week on the FlipRuns blog.