How it works
The calculator begins with ARV, the price you reasonably expect to sell the property for after repairs. From that, it subtracts your purchase price and rehab costs to compute a simple Gross profit = ARV − Purchase − Rehab. This shows the spread between what you paid plus renovation budget and what you expect to resell for, before you consider carry and closing friction.
Next, it layers in the true all‑in cost of the project. Buy‑side closing costs—title, escrow, inspections, lender fees—and holding costs like interest, taxes, insurance, and utilities are added. On the sell side, the calculator computes Sell‑side closing costs as a percentage of ARV, representing commissions and seller‑paid closing fees.
Total project costs are then calculated as Purchase + Rehab + Holding + Buy‑side closing + Sell‑side closing. This figure reflects the full amount of cash that goes into the deal (regardless of whether it came from your pocket or a lender) before you receive sales proceeds.
Net profit is computed as ARV − Total costs. This is the dollars you have left after paying for the property, the rehab, the carry, and the friction of buying and selling. If this number is thin, one bad surprise can wipe out your return.
Finally, the calculator derives ROI as Net profit ÷ Total costs. This gives you a simple project‑level return on the total capital committed to the flip. While it is not time‑adjusted like IRR, it provides a useful first‑pass sense of whether a deal clears your minimum profit and return hurdles.
By keeping the math transparent and showing each major cost bucket explicitly, the tool makes it easier to stress‑test your assumptions—reducing ARV a bit, increasing rehab and holding, or changing commission percentages to see how quickly a promising flip turns into a marginal one.