Analyze your fix-and-flip investment
House flipping — buying a property, renovating it, and selling it for profit — can be highly lucrative but also carries significant financial risk. The flip profit calculator helps you analyze every cost component of a flip deal before committing, ensuring you understand your potential profit, ROI, and risk exposure. Successful flippers know that profit is made at purchase, not at sale. This means buying at the right price is critical, and this calculator helps you verify deal quality using industry-standard metrics like the 70% Rule, which states that you should pay no more than 70% of the after-repair value (ARV) minus renovation costs. The calculator tracks all cost categories: purchase costs, renovation expenses, holding costs during the rehab period, financing costs if using hard money or conventional loans, and selling costs including agent commissions and closing fees. The waterfall chart visualizes how costs build up from purchase price to final profit. Whether you're analyzing your first flip or your fiftieth, use this tool to compare deals, run sensitivity analysis on sale prices, and ensure your margins justify the risk involved.
Understanding House Flipping
What Is House Flipping?
House flipping is a real estate investment strategy where an investor purchases a property (usually below market value), renovates or improves it, and resells it for profit within a relatively short timeframe — typically 3 to 12 months. Success depends on buying at the right price, accurately estimating renovation costs, completing work on time and budget, and selling at or above the after-repair value (ARV). Flipping differs from buy-and-hold investing because the goal is a quick profit rather than ongoing rental income.
How Is Flip Profit Calculated?
Flip profit equals net sale proceeds minus total investment. Total investment includes purchase price, buying closing costs, renovation costs, holding costs (mortgage payments, insurance, utilities, and taxes during the rehab period), and financing costs (loan interest, origination points). Net sale proceeds equal the sale price minus selling closing costs and agent commissions. ROI is the profit divided by total investment, expressed as a percentage. Annualized ROI adjusts for the holding period, allowing comparison between flips of different durations.
Why Accurate Analysis Matters
Most failed flips result from underestimating costs, not from buying the wrong property. Renovation costs commonly exceed initial estimates by 20-30%, and holding costs add up quickly — every extra month of rehab time costs mortgage payments, insurance, taxes, and utilities. Agent commissions alone consume 5-6% of the sale price. Without thorough cost analysis, a flip that appears profitable on the surface can easily result in a loss. The 70% Rule exists as a safety margin to protect against these overruns.
Limitations
This calculator provides estimates based on your inputs — actual results depend on construction quality, market timing, and unexpected issues like permits, inspections, or hidden damage. Sale price projections assume normal market conditions; market downturns can significantly impact ARV. Holding costs are simplified as monthly averages; actual costs may vary. Tax implications (capital gains, depreciation recapture) are not included and can significantly affect net profit. Always consult with a real estate professional and accountant before committing to a flip.
How to Use This Calculator
Enter Purchase and Sale Details
Input the property purchase price and your expected after-repair value (ARV). This establishes the gross spread — the difference between what you pay and what you sell for.
Add All Cost Components
Enter renovation costs, buying and selling closing costs, agent commission, and monthly holding costs with the expected project timeline. Open the financing section if using a loan.
Review Profit and Deal Quality
Check your net profit, ROI, and the 70% Rule analysis. The waterfall chart shows how costs build up from purchase to final profit. The sensitivity table shows how changes in sale price affect your returns.
Compare and Export
Use the break-even sale price to understand your downside risk. Export results to CSV for comparison with other deals, or print for presentation to partners or lenders.
Frequently Asked Questions
What is the 70% Rule in house flipping?
The 70% Rule is a quick guideline used by house flippers to determine the maximum purchase price for a profitable flip. It states: Maximum Purchase Price = ARV × 70% − Renovation Costs. For example, if a property's ARV is $300,000 and it needs $40,000 in renovations, the maximum purchase price should be $300,000 × 0.70 − $40,000 = $170,000. The 30% margin accounts for holding costs, closing costs, commissions, and profit. While useful as a quick filter, experienced flippers adjust the percentage based on market conditions and their actual cost structure.
What ROI should I target for a house flip?
Most experienced flippers target a minimum ROI of 15-20% on total investment, with a minimum net profit of $25,000-$30,000 per flip to justify the risk and effort involved. Higher-risk projects (major structural work, declining markets) should target higher returns to compensate. When annualized, good flips typically deliver 30-60%+ ROI because the holding period is short. However, these are guidelines — your target should account for your experience level, market conditions, and risk tolerance. New flippers should be more conservative with their projections.
What costs do most flippers underestimate?
The most commonly underestimated costs are: renovation contingency (always add 10-20% buffer for unexpected issues like hidden water damage, electrical problems, or permit requirements), holding costs (every extra month adds mortgage, insurance, taxes, and utilities), agent commissions (5-6% of a $300K sale is $15-18K), and closing costs on both purchase and sale sides. Additionally, many flippers forget to budget for staging, photography, and minor touch-ups before listing. Hard money loan costs are also frequently underestimated — interest rates of 10-15% plus 1-3 points in origination fees add up quickly.
How long does a typical house flip take?
The average house flip takes 4-6 months from purchase to sale, though this varies significantly based on renovation scope. Cosmetic flips (paint, flooring, fixtures) can be completed in 2-3 months. Medium renovations (kitchen, bathrooms, landscaping) typically take 3-5 months. Major rehabs (structural work, additions, full gut renovations) can take 6-12 months or more. Market conditions affect the selling timeline — hot markets may sell in days, while slower markets might take 2-3 months. Every extra month increases holding costs and reduces your annualized ROI.
Should I use financing or cash for a flip?
Both approaches have trade-offs. Cash offers win more deals, close faster, and eliminate interest costs and origination fees. However, financing allows you to flip more properties simultaneously and preserves cash for unexpected costs. Hard money loans are the most common financing for flips — they offer fast closing (1-2 weeks) but charge higher rates (10-15%) and points (1-3%). The decision depends on your available capital, deal volume, and the specific numbers of each deal. Our calculator lets you see how financing costs affect your profit.
What is the break-even sale price?
The break-even sale price is the minimum amount you need to sell a property for to recover all costs without any profit or loss. It includes your purchase price, all closing costs (buying and selling), renovation costs, holding costs, financing costs, and agent commissions. Knowing your break-even price is crucial for understanding your downside risk — if the market softens and you need to sell quickly, you'll know the lowest acceptable offer. Our calculator shows this figure prominently so you can assess deal safety before committing.