Fix and Flip Calculator: Profit, ROI & the 70% Rule
A flip looks simple — buy low, renovate, sell high — but holding costs, financing and selling fees quietly eat the margin. Here's how to calculate the real profit before you commit.
The flip profit formula
Profit = Sale Price − Selling Costs − Purchase − Closing − Rehab − Holding Costs. The two most underestimated pieces are holding costs (loan interest, taxes, insurance and utilities for every month you own it) and selling costs (6–8% of the sale price).
The 70% rule
A classic screen: don't pay more than 70% of ARV minus rehab. On a $290k ARV with $44k rehab, that's a max offer of about $159k. It builds in room for costs and profit — treat it as a guardrail, not a guarantee.
Annualized ROI matters
A 35% return in six months is far better than 35% over two years. Always look at the annualized return so you can compare flips of different lengths fairly.
Fix & Flip / BRRRR Analyzer
Stop computing this by hand. The Fix & Flip / BRRRR Analyzer does it for you — instantly, with a clear verdict at the end. One-time $34, works in Excel & Google Sheets.
View the Fix & Flip / BRRRR Analyzer