Fix and Flip Calculator: Estimate Profit on Any Flip Deal
The difference between a profitable flip and a financial disaster often comes down to the accuracy of your numbers before you buy. A fix-and-flip calculator forces you to think through every cost component of a deal before committing capital, replacing gut feelings with hard math. Whether you are analyzing your first flip or your fiftieth, the underlying calculation framework is the same: estimate what the property will sell for after renovation, subtract every cost involved in buying, holding, renovating, and selling, and whatever remains is your profit.
This guide walks through the complete fix-and-flip calculation, explains each input and output, provides a detailed example, and covers the common shortcuts and pitfalls that cause investors to miscalculate their returns.
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The Core Fix-and-Flip Formula
At its simplest, a flip profit calculation is:
Profit = After-Repair Value (ARV) - Purchase Price - Rehab Costs - Holding Costs - Selling Costs - Buying Costs
Each of these components has sub-elements that need to be estimated individually. Let us break them down.
Input 1: After-Repair Value (ARV)
The ARV is the estimated market value of the property after all renovations are complete. This is the most important number in your entire analysis because every other calculation flows from it. If your ARV is wrong, your profit estimate will be wrong regardless of how accurate everything else is.
To determine ARV, you analyze comparable sales (comps). Look for properties that have sold within the last 6 to 12 months, within a half-mile to one-mile radius, with similar square footage (within 20 percent), similar bedroom and bathroom count, similar lot size, and in similar or better condition than your planned renovation outcome. Ideally, use three to five solid comps and calculate the average or median sale price per square foot, then apply that to your subject property's square footage.
Common ARV mistakes include using active listings instead of sold prices (what a seller is asking is not what the market will pay), using comps that are too far away or too old, overestimating the quality of your renovation relative to the comps, and failing to account for differences in lot size, location, or neighborhood desirability within the same zip code.
Input 2: Purchase Price
This is straightforward: the price you pay for the property. If you are buying from a wholesaler, this is the assignment price. If you are buying at auction, this is your winning bid. If you are buying direct from a seller, this is the negotiated purchase price. Do not include closing costs here as those are accounted for separately as "buying costs."
Input 3: Rehab Costs
The rehabilitation budget is where most inexperienced flippers get burned. Underestimating rehab costs is the single most common reason flips lose money. A thorough rehab estimate breaks down costs by category.
Exterior: Roof replacement ($5,000 to $15,000 depending on size and material), siding repair or replacement, exterior paint ($2,000 to $5,000), windows ($300 to $800 per window), landscaping ($2,000 to $5,000), driveway and walkway repair, fencing, and gutters.
Kitchen: Cabinets or cabinet refacing ($3,000 to $15,000), countertops ($2,000 to $6,000 for quartz or granite), appliances ($2,000 to $5,000 for a standard stainless package), backsplash ($500 to $2,000), flooring, lighting, plumbing fixtures, and potential layout changes. A standard cosmetic kitchen remodel runs $10,000 to $25,000. A full gut renovation with layout changes can exceed $40,000.
Bathrooms: Vanity, toilet, tub/shower, tile, flooring, lighting, and plumbing fixtures. A standard bathroom renovation runs $3,000 to $8,000 per bathroom. Master bathrooms with large showers and double vanities can run $8,000 to $15,000.
Flooring: Luxury vinyl plank ($3 to $6 per square foot installed) has become the standard for flips due to its durability, waterproof properties, and appearance. Hardwood refinishing ($3 to $5 per square foot) is an option for homes with existing hardwood floors in decent condition. Tile in wet areas ($5 to $10 per square foot installed). Budget $5,000 to $12,000 for a typical 1,500 to 2,000 square foot home.
Paint: Interior paint for a full house runs $3,000 to $7,000 depending on square footage and the number of coats needed. Exterior paint adds $2,000 to $5,000.
Systems: HVAC replacement ($5,000 to $12,000), electrical panel upgrade ($1,500 to $3,000), plumbing repairs ($500 to $5,000), and water heater replacement ($800 to $2,000). Not every flip needs system replacements, but older homes often do.
Contingency: Always add 10 to 15 percent to your total rehab estimate as a contingency. Every renovation reveals surprises: hidden water damage, termite damage behind walls, outdated electrical that does not meet code, or plumbing issues that are not visible during a walkthrough. The contingency budget covers these unknowns.
Input 4: Holding Costs
Holding costs are the expenses you incur every month you own the property, from purchase to sale. These accumulate whether you are actively renovating or waiting for a buyer. Typical holding periods for flips range from 3 to 8 months.
Mortgage or hard money payments: If financed, your monthly debt service is your largest holding cost. Hard money loans typically carry 10 to 14 percent annual interest rates with 1 to 3 points at origination. On a $200,000 loan at 12 percent, monthly interest is $2,000.
Property taxes: Prorated based on the annual tax amount divided by 12. On a property with $6,000 in annual taxes, that is $500 per month.
Insurance: Builder's risk or vacant property insurance. Typically $100 to $300 per month.
Utilities: Electric, gas, water, and trash service during renovation and the selling period. Budget $200 to $400 per month.
HOA fees: If applicable, $50 to $500 per month depending on the community.
For a 5-month flip with hard money financing, holding costs on a $200,000 property might total $12,000 to $16,000. Many new flippers forget to include holding costs entirely, which can erase thousands in expected profit.
Input 5: Selling Costs
Selling costs include everything associated with selling the renovated property.
Agent commissions: If you list with an agent, expect 5 to 6 percent of the sale price. On a $300,000 sale, that is $15,000 to $18,000. Some flippers sell FSBO (for sale by owner) to save on commissions, but this can increase your days on market and reduce your buyer pool.
Seller closing costs: Title insurance, recording fees, transfer taxes (where applicable), and document preparation. Typically 1 to 2 percent of the sale price.
Concessions: Buyers may request closing cost credits, repair credits, or home warranty coverage. Budget 1 to 2 percent for potential concessions.
In total, selling costs typically run 7 to 10 percent of the sale price.
Input 6: Buying Costs
Costs to acquire the property include title search, title insurance (if you purchase an owner's policy), recording fees, loan origination fees (points), appraisal, inspection, and attorney fees. For a cash purchase, buying costs are typically $1,000 to $3,000. For a financed purchase, add loan origination fees (1 to 3 percent of the loan amount) and potentially an appraisal ($400 to $600).
Complete Walkthrough Example
Let us run through a realistic example for a single-family home flip in a suburban market.
Property: 3-bedroom, 2-bathroom ranch, 1,600 square feet, built in 1995, needs cosmetic updates throughout. Purchased from a wholesaler.
ARV analysis: Three recent comps in the same subdivision sold for $285,000, $295,000, and $290,000 after renovation. Average is $290,000. Comp price per square foot is approximately $178 to $184. Subject at 1,600 sqft suggests an ARV of $285,000 to $295,000. We will use $290,000 conservatively.
The numbers:
- ARV: $290,000
- Purchase price: $185,000
- Rehab costs: $42,000 (kitchen $15,000, two bathrooms $10,000, flooring $7,000, paint $4,000, landscaping $3,000, contingency $3,000)
- Holding costs (5 months): $12,500 (hard money at $2,000/mo + taxes $400/mo + insurance $150/mo + utilities $250/mo = $2,500/mo x 5)
- Selling costs (8%): $23,200 (agent commission $15,950 + closing costs $4,350 + concessions $2,900)
- Buying costs: $7,550 (2 points on $185,000 loan = $3,700 + title/recording $1,850 + inspection/appraisal $1,000 + miscellaneous $1,000)
Profit = $290,000 - $185,000 - $42,000 - $12,500 - $23,200 - $7,550 = $19,750
Return metrics:
- ROI (profit / total investment): $19,750 / $247,250 = 8.0%
- Cash-on-cash return: Depends on how much cash you invested. If you borrowed 85% and put 15% down ($27,750 down payment + $42,000 rehab funded from a line of credit), your cash in might be $35,000 to $70,000 depending on your financing structure.
- Annualized ROI: If the project took 5 months, annualize the 8% ROI to approximately 19.2%.
The 70% Rule: A Quick Screening Tool
The 70% rule is a shortcut that experienced flippers use to quickly screen deals before running a full analysis. The formula is:
Maximum Offer = ARV x 70% - Rehab Costs
Using our example: $290,000 x 0.70 - $42,000 = $203,000 - $42,000 = $161,000. This means you should not pay more than $161,000 for this property if you want to follow the 70% rule.
We paid $185,000, which is above the 70% rule threshold. Does that mean it is a bad deal? Not necessarily. The 70% rule is a rough screening tool that assumes average holding and selling costs. In markets where these costs are lower (cheaper financing, lower taxes, lower commissions), you can pay more than the 70% rule suggests and still be profitable. The rule is most useful for quickly filtering a large pipeline of potential deals down to the ones worth detailed analysis.
Some investors use 75% in hot markets with fast sale times, or 65% in slow markets or for higher-risk properties. The percentage should reflect your local cost structure and risk tolerance.
Common Calculation Mistakes
Ignoring holding costs: On a 6-month project with hard money, holding costs can easily reach $15,000 to $20,000. That is real money coming straight out of your profit.
Underestimating rehab: Get multiple contractor bids. Walk the property with your contractor before making an offer, not after. And always include a contingency.
Using optimistic ARV: Use the most comparable comps, not the highest ones. If three comps sold for $280K, $290K, and $320K, do not use $320K as your ARV unless you can justify why your property will match that outlier.
Forgetting selling costs: Agent commissions, seller closing costs, and buyer concessions total 7 to 10 percent. On a $300,000 sale, that is $21,000 to $30,000.
Not accounting for time: Renovation delays happen. Permitting delays happen. Contractor no-shows happen. Build buffer into your timeline, and calculate holding costs based on the worst-case scenario, not the best.