You find a run-down property listed at $280,000. Comparable homes in the area sell for $425,000 after renovations. Looks like an easy $145,000 profit, right? Not even close. After closing costs, renovation overruns, property taxes, insurance, loan interest, and the 6% realtor commission when you sell, you might walk away with barely $20,000—or worse, lose money. This is why so many first-time flippers fail. Our House Flipping Calculator helps you account for every expense upfront, from hard money loan payments to unexpected repair costs, so you can make informed offers and protect your investment.
How to Use
Enter the purchase price and your estimated renovation budget. Input the after-repair value (ARV) based on local comparable sales. Add your financing details—loan amount, interest rate, and expected holding period. The calculator instantly shows your total cash needed, monthly carrying costs, and projected profit margin.
Pro Tips
Follow the 70% rule as your baseline offer. Experienced flippers pay no more than 70% of ARV minus repair costs. If a home will sell for $400,000 after $50,000 in renovations, your max purchase price is $230,000 ($400,000 Ă— 0.70 - $50,000).
Secure financing before hunting for deals. Hard money lenders typically charge 10-15% interest plus 2-4 points upfront, and they require 20-30% down. Know your cost of capital cold.
Research local permit requirements. Some cities require permits for basic electrical or plumbing work, adding weeks to your timeline and $500-$2,000 in fees. Delays cost money when you're paying monthly loan interest.
Build your contractor relationships now. Quality contractors book up months in advance. Having a reliable team ready to start immediately can shave weeks off your project and thousands off holding costs.
Common Mistakes to Avoid
Underestimating renovation costs destroys more flips than any other mistake. Investors budget $35,000 for updates, then discover foundation cracks or outdated wiring that adds $25,000. Always pad your rehab budget by 15-20% for surprises.
Ignoring holding costs catches beginners off guard. On a $350,000 purchase with 20% down, you'll pay monthly interest, property taxes, insurance, and utilities. If your flip sits for six months instead of three, those costs compound fast.
Forgetting selling expenses is a classic error. Between title fees, transfer taxes, escrow costs, and the standard 5-6% agent commission, expect to lose 8-10% of your sale price. On a $400,000 sale, that's $32,000 to $40,000 off the top.
Frequently Asked Questions
How much cash do I need to flip a house?
Plan on $50,000-$80,000 in liquid cash for your first flip. This covers your down payment (typically 20-30% with hard money loans), renovation costs, and a reserve fund for surprises. On a $280,000 property needing $60,000 in repairs, you might need $70,000+ upfront.
What profit margin should I target on a flip?
Aim for a minimum 20-30% profit margin or at least $30,000-$50,000 net profit per flip. On a property with a $400,000 ARV, you'd want $80,000-$120,000 gross profit to end up with $40,000-$70,000 after all expenses. Less than that rarely justifies the risk and effort.
How do I accurately estimate the after-repair value?
Pull comparable sales from the last 90 days within half a mile. Look for homes with similar square footage, bedroom count, and lot size. Zillow and Redfin show sold prices, but a local realtor can provide a detailed comparative market analysis (CMA) for accuracy.