Fix and Flip Calculator

What This Calculator Does and Why It Matters

House flipping can be highly profitable — or a fast way to lose money — depending almost entirely on how accurately you project your costs before you buy. This free fix and flip calculator helps real estate investors estimate net profit, return on investment, total project costs, and all line-item expenses before committing to a deal.

The calculator accounts for the full cost picture: purchase price, renovation budget, financing costs, carrying charges like taxes and utilities, buying and selling closing costs, and agent commissions. What is left after all of that is your true net profit. According to ATTOM Data Solutions, the average gross flipping profit in the United States has historically ranged from $60,000 to $80,000 per deal — but gross profit is very different from net profit once all costs are counted.

Whether you are analyzing your first flip or evaluating deal number fifty, running the numbers before signing anything is non-negotiable. You can also cross-reference your deal using the fix and flip profit margin calculator to check your margin percentage against industry benchmarks.

How to Use This Calculator

Step-by-Step Instructions

1. Enter the purchase price of the property in dollars.
2. Enter your down payment percentage. Hard money loans typically require 10 to 30 percent down.
3. Enter the annual interest rate on your loan. Hard money rates typically range from 8 to 14 percent.
4. Enter your hold period in months — this is the time from purchase to sale.
5. Enter your estimated renovation and rehab cost.
6. Enter your estimated buying closing costs, including title fees, inspection, and origination points.
7. Enter monthly property taxes and insurance combined.
8. Enter monthly utility and miscellaneous carrying costs.
9. Enter the After Repair Value — the projected sale price after renovations are complete.
10. Enter the agent commission percentage and estimated selling closing costs.
11. Click Calculate Profit to see your full cost breakdown and net profit figure.

The Formula Explained

Breaking Down the Formula

The fix and flip profit formula is: Net Profit = ARV − Total Costs. Total costs include purchase price, renovation costs, loan interest, carrying costs over the hold period, buying closing costs, selling closing costs, and agent commission. ROI is then calculated as Net Profit divided by your total cash invested (your down payment plus renovation plus buying costs), expressed as a percentage.

Loan interest is calculated on the loan amount — purchase price minus your down payment — at the monthly interest rate for each month of the hold period. Carrying costs multiply your monthly tax, insurance, and utility expenses by the number of months held. Agent commission is a percentage of the sale price. Every dollar of cost that goes unaccounted for in the pre-deal analysis is a dollar that surprises you at closing.

Example Calculation with Real Numbers

Suppose you buy a home for $180,000, put 20% down ($36,000), borrow $144,000 at 10% annual interest for 6 months, spend $45,000 on renovation, $3,500 to buy and $2,500 to sell, pay $300/month in taxes and $150/month in utilities, sell for $290,000 ARV, and pay 6% agent commission ($17,400). Loan interest = $144,000 × (10%/12) × 6 = $7,200. Carrying costs = $450 × 6 = $2,700. Total costs = $180,000 + $45,000 + $7,200 + $2,700 + $3,500 + $17,400 + $2,500 = $258,300. Net profit = $290,000 − $258,300 = $31,700. ROI = $31,700 / ($36,000 + $45,000 + $3,500) = 37.3%.

When Would You Use This

Real Life Use Cases

This calculator is built for two main moments in a flip deal: pre-offer analysis and post-renovation sanity check. Before you make an offer, running the numbers with conservative ARV estimates and realistic rehab costs tells you whether a deal has enough margin to be worth pursuing. A general rule in fix and flip investing is that your total acquisition and rehab costs should not exceed 70 percent of the ARV — the so-called 70 percent rule.

The calculator is also useful mid-project when cost overruns happen. Re-entering updated renovation figures and a revised ARV shows you whether the deal still makes sense to complete or whether cutting losses early makes more financial sense. For financing your flip, check the hard money loan points and interest calculator to estimate your full borrowing cost before committing to a lender.

Specific Example Scenario

An investor finds a distressed property listed at $200,000 in a neighborhood where comparable homes sell for $320,000 after renovation. She estimates $55,000 in rehab, 6 months hold time, and 10% hard money interest. Running the numbers in this calculator shows a projected net profit of $38,000 — a healthy 30% ROI on her cash invested. She submits an offer at $195,000 to add a bit more margin and uses the result to justify the deal to her private money partner.

Tips for Getting Accurate Results

Always Use a Conservative ARV

The ARV — After Repair Value — is the single number that determines whether your deal makes money. Most experienced flippers recommend using the lowest comparable sale from the past 90 days rather than the highest. Markets shift, and if your ARV estimate is off by 5 to 10 percent, it can wipe out your entire profit margin. Pull your comps from MLS data or platforms like Zillow and Realtor.com, and stick to sales within 0.5 miles and 200 square feet of your subject property.

Do Not Underestimate Renovation Costs

Renovation budgets almost always run over. A common practice among experienced flippers is to add a 10 to 20 percent contingency buffer on top of contractor estimates. Structural issues, permit delays, and material price changes are frequent surprises. Enter your realistic rehab number — not your best-case number — into this calculator.

Account for Every Month of the Hold Period

Carrying costs accumulate every single month the property sits unsold. If your renovation takes longer than planned, every extra month adds loan interest, taxes, utilities, and insurance to your expense column. For a $200,000 loan at 10% interest, each extra month costs roughly $1,667 in interest alone. For broader cost planning, the real estate capital gains tax calculator can help you estimate your tax liability on the profit side of the deal. You can also learn more about fix and flip investing through resources like Investopedia’s house flipping guide.

Frequently Asked Questions

What is the 70 percent rule in fix and flip investing?

The 70 percent rule states that an investor should not pay more than 70 percent of the ARV minus the estimated repair costs for a flip property. For example, if the ARV is $300,000 and repairs are $50,000, the maximum purchase price should be ($300,000 × 0.70) − $50,000 = $160,000. This rule preserves enough margin to cover all costs and still generate profit.

What is a good ROI for a fix and flip deal?

Most experienced flippers target a minimum net ROI of 15 to 20 percent on cash invested per deal. Deals in competitive markets with thin margins may come in lower. A 30 percent or higher ROI is considered strong, particularly for shorter hold periods of 3 to 6 months.

How do I estimate renovation costs accurately?

Get at least two or three contractor bids before purchasing. Walk the property with a licensed inspector and contractor together if possible. Create a detailed scope of work and price each line item. Add a 10 to 15 percent contingency on top of your total estimate to account for surprises.

What is the typical hold period for a house flip?

The average fix and flip hold period is 4 to 8 months from purchase to closing on the sale. More extensive renovations can extend this to 12 months or more. Every additional month adds carrying costs, so faster project execution directly increases profitability.

Should I use hard money or conventional financing for a flip?

Most flippers use hard money loans because conventional lenders typically will not finance properties in poor condition. Hard money lenders approve based on the property’s ARV rather than your income. The tradeoff is a higher interest rate — usually 8 to 14 percent — and origination points. The hard money loan cost estimator calculator can help you model the full borrowing cost before choosing a lender.

Do I pay capital gains tax on flip profits?

Yes. If you hold the property for less than one year, flip profits are taxed as ordinary income, not at the lower long-term capital gains rate. For active flippers operating as a business, profits may also be subject to self-employment tax. Consult a tax professional before your first flip to plan your tax strategy correctly.

What costs do most first-time flippers forget to include?

Common overlooked costs include loan origination points (1 to 3 percent of the loan), property insurance during renovation, permit fees, landscaping and staging for sale, utility hookup fees, and the cost of your own time. This calculator includes the main cost categories — make sure you have accurate numbers for each field.

Is it better to flip alone or with a partner?

Partnering can reduce your cash-out-of-pocket requirement and share risk, but it also splits profits. A common structure is a 50/50 split where one partner provides capital and the other manages the project. Whatever structure you use, always formalize it with a written operating or partnership agreement before any money changes hands.

Conclusion

A successful fix and flip starts with a clear and honest picture of all your costs before you commit to a purchase. This calculator gives you the full breakdown — purchase, renovation, financing, carrying, commissions, and closing costs — so you can see your true net profit and ROI before signing anything.

For more deal analysis tools, explore the rental property cash-on-cash return calculator if you are considering holding the property instead of flipping it, and check the closing costs estimator by state calculator to sharpen your transaction cost estimates.