House Flipping Calculator: Instantly See Profit, Funding Coverage & Your Gap to Close

Run Your Flip Numbers in Seconds (Calculator at the Top)

The interactive house flipping calculator above is free to use and built to give you answers in seconds, not hours. Enter your deal details and instantly see projected net profit after all costs, total project cost, what a hard money loan will typically cover, and the remaining “gap” you need to fund out of pocket.

This page and calculator are built by Gap Funded, a capital-stacking specialist that helps fix and flip and BRRRR investors close the funding gap between what lenders cover and what the deal actually requires. Before you run your first scenario, gather these inputs: target purchase price, rehab budget, estimated after repair value (ARV), your lender’s terms (interest rate, points, LTC), estimated holding period in months, and your expected closing and selling costs.

The rest of this article walks you through how to interpret every number the calculator produces, how to stress-test your deal against real risks, and exactly how Gap Funded products can plug whatever funding gap remains so you can close with confidence.

Finally, a House Flipping Calculator Built for Real Investors Who Need Funding Too

Most investors lose money on their first house flip not because they picked a bad property, but because they underestimated costs, overestimated ARV, and didn’t realize how much cash they’d actually need until the closing table was days away. A house flipping calculator estimates the profitability of a fix-and-flip project, but most online versions stop at a rough profit number and leave you guessing about everything else.

This fix and flip calculator goes further. It shows what a typical hard money lender will finance, what must come from your own cash or gap capital, and what your true potential profit looks like after every line item is accounted for. It’s designed for fix and flip deals, BRRRR conversions, and short-term rental value-add projects across U.S. markets in 2024–2026 conditions - an environment where hard money interest rates sit at 11–13% and lenders are tightening LTC and LTARV caps.

Gap Funded is a B2B and B2C funding partner that helps house flippers stack unsecured personal term loans, 0% business credit cards, HELOCs, and business lines of credit - without equity splits, without liens on the flip property, and without a hard credit pull just to see your options, which is the core of our gap funding approach in real estate.

Why This House Flipping Calculator Actually Helps You Avoid Bad Deals

Other tools give you rough math. This one functions as a real underwriting helper for both your numbers and your funding strategy. Using a house flipping calculator reduces emotional buying decisions in real estate investing, replacing gut feelings with hard data.

• Full cost visibility – The calculator forces you to include purchase price, rehab costs, closing costs, holding costs, and selling costs - not just “purchase plus rehab.” Total project cost includes purchase, rehab, and holding costs, plus every exit expense. Professional cleaning and staging costs, which many investors forget, can significantly affect selling costs and are captured here.
• Funding coverage breakdown – It separates what a typical hard money or DSCR lender will finance versus what must come from your own cash or gap funding. Most lenders cover 70–85% of loan-to-cost, subject to an LTARV cap often around 70%. This calculator makes that math visible so you’re never surprised.
• True cash needed at closing – Down payment, origination points, closing costs, and your first months of holding costs are itemized so you know your minimum cash-out-of-pocket before you make an offer.
• Instant risk checks – The results show profit as a percentage of ARV, margin of safety against ARV drops, and sensitivity to rehab overruns or timeline extensions. A good calculator helps compare multiple property investment scenarios efficiently, and the risk signals here let you kill bad deals before they kill your returns.
• Built-in “gap funding” view – The output surfaces the exact dollar gap that Gap Funded’s services can potentially cover with unsecured term loans, credit card stacking, HELOCs, and lines of credit - so you move from “I can’t afford this deal” to “here’s how I fund it.”

How the House Flipping Calculator Works

This section breaks down the step-by-step flow so even a first-time investor understands each field, what to enter, and why it matters.

Step 1: Enter Property & ARV Assumptions

Start by entering your target purchase price, the property’s current condition, and your estimated after repair value (ARV). After repair value is the estimated market value of the property after renovations - and it’s the single most important number in any flip analysis.

Accurate ARV estimates require using comparable sales data. Use comps from the past 90 days, within half a mile, with similar bed/bath counts and square footage. Optimistic comps are the number-one reason flippers overestimate potential return and end up underwater.

The calculator can also apply the 70% Rule as a quick “max offer” guideline: the 70% Rule suggests max purchase price equals 70% of ARV minus repairs. For example, on a property with an ARV of $350,000 and a $50,000 rehab budget, the max allowable offer would be ($350,000 × 0.70) − $50,000 = $195,000. If the seller wants $220,000, you immediately know the margin is thin and the deal needs renegotiation or a pass.

Step 2: Input Rehab Scope, Budget & Timeline

Enter your rehab budget as either a detailed line-item total or a lump sum. Rehab costs include materials and labor expenses, and you’ll also input a contingency percentage to cushion against the unexpected.

Separate cosmetic renovations (paint, flooring, fixtures) from structural or systems work (foundation, HVAC, electrical, plumbing). Why? Cosmetic rehabs typically hold to budget, while structural projects routinely overrun. Unexpected costs should include a 10–15% buffer in estimates for standard projects. For older housing stock - think 1950s homes needing full systems updates - add a 20% buffer. Hidden costs can include unexpected repairs and financing expenses during the holding period, and they’re the fastest way to turn a profitable flip into a loss.

You’ll also input estimated rehab duration in months. Cosmetic jobs often run 4–6 months. Moderate rehabs take 6–9 months. Gut renovations with permit delays can stretch to 9–12 months or longer. Every additional month multiplies your holding costs.

Step 3: Add Financing Terms & Holding Costs

Input your hard money loan details: loan amount or LTC percentage, interest rate (currently 11–13% for most flip loans), origination points (typically 2–4 points), term length, and whether loan interest is paid monthly or capitalized at payoff.

The calculator then estimates monthly holding costs. Holding costs include taxes, insurance, and utilities. Monthly property taxes can average $50 during a flip, while monthly insurance for unoccupied properties can be $20 to $250 depending on coverage and location. Add utilities, HOA dues, and any lawn care or property maintenance. These numbers feel small individually, but they compound fast.

Watch how the holding period changes your results. A 6-month hold versus a 9-month hold can swing total project cost by thousands of dollars and dramatically shrink your net profit. Holding costs can significantly impact profit margins during a flip - this is where the calculator’s sensitivity becomes your best friend.

Step 4: Factor in Purchase & Exit Costs

Buying and selling costs encompass transaction expenses like closing costs and agent commissions. On the purchase side, input title fees, escrow, appraisal, inspections, and lender origination fees. On the selling side, factor in agent commissions (typically 5–6%), seller closing costs, staging, photography, and any concessions to buyers.

Selling costs can include realtor fees and closing costs, and in many 2026 markets these total 6–8% of the sale price. The calculator totals these into a “cost of sale” figure and shows how even a 1% change in commissions or concessions shifts your bottom line. Don’t forget these - they’re real money coming out of your proceeds.

Step 5: Review Profit, ROI & Your Funding Gap

The results screen delivers everything you need to make a go or no-go decision, and you can pair it with our dedicated Gap Funding Calculator to focus specifically on your capital shortfall and stacking options:

• Total project cost - the complete sum of purchase, rehab, holding, closing, and selling costs.
• Anticipated profit - in dollars, calculated as ARV minus total project cost. Profit margin is calculated as ARV minus total project cost.
• Profit as % of ARV - your margin of safety. Investors often require a minimum projected ROI of 15% to 20% for a profitable flip.
• Cash-on-cash return - ROI is profit relative to total cash invested in the flip, not total project cost. This is the number that matters when you’re deploying gap funding.

The calculator clearly labels: how much of the deal is paid by the hard money lender, how much cash is required from the investor, and how much of that cash requirement could be covered by Gap Funded gap funding options.

Here’s a quick example: on a $250,000 ARV flip with a $180,000 purchase price, $40,000 rehab budget, and a 12% hard money loan covering 80% LTC, the loan covers roughly $176,000. After adding points, closing costs, holding costs, and contingency, you’d need approximately $42,000–$48,000 in cash. That’s your funding gap - and it’s exactly what Gap Funded is built to fill.

What Makes Gap Funded’s Approach Different

Most hard money lenders hand you one loan and wish you luck covering the rest. Gap Funded takes a fundamentally different approach by building a complete capital stack around your deal.

• Capital stack, not just one loan – Gap Funded layers unsecured term loans, 0% business credit cards, HELOCs, and business lines of credit on top of your hard money loan to fully fund down payments, closing costs, and rehab draws. Instead of scrambling for a money partner at the last minute, you build a funding plan that covers every dollar the primary lender won’t.
• Non-dilutive, no equity splits – You keep 100% of the upside. Traditional money partners and gator lenders often take 30–50% of your profit. Gap Funded’s capital products carry interest costs, but you never share a penny of your return on investment.
• Fast, low-friction approval – Gap Funded uses a soft credit pull for initial review, with no impact on your credit score. Unsecured term loans can fund in 1–3 days. Credit card stacking delivers working capital in 1–10 days. Even HELOCs, which take longer, can close in 14–45 days. That speed matches the tight 7–14 day contract timelines that competitive markets demand.

This article and calculator are specifically designed to make it easy to see where Gap Funded capital fits in each flip - right down to the dollar.

Real-World Example: Using the Calculator to Structure a Flip’s Capital Stack

Let’s walk through a realistic 2026 deal to show how the calculator and Gap Funded work together.

The property: A 3-bed, 1-bath single-family home in Atlanta. Purchase price: $200,000. ARV: $320,000. Rehab budget: $50,000 (cosmetic plus HVAC replacement) with a 10% contingency ($5,000). Estimated holding period: 8 months.

Financing terms: Hard money loan at 12% annual interest rate, 3 points, covering 85% of purchase ($170,000) plus 100% of rehab ($50,000) = $220,000 loan amount, subject to LTARV cap of 70% ($224,000 - so the loan passes the cap check).

The calculator shows:

Wait - that profit looks thin. But here’s the key: the calculator flags this as a marginal deal at 8 months. Reduce the holding period to 6 months (tighter project management), and the numbers shift: interest drops to $13,200, holding costs drop to $8,400, and profit climbs to approximately $12,700 with a stronger ROI.

The funding gap: Hard money covers $220,000 of the $259,500 in acquisition and rehab costs. The investor needs roughly $45,000 upfront for the down payment shortfall, points, closing costs, and initial holding reserves.

Gap Funded covers it:

• $25,000 unsecured personal term loan for the down payment and closing costs
• $15,000 in stacked 0% business credit cards for materials and contractor payments
• $5,000 drawn from an existing HELOC for reserves

Final out-of-pocket: near zero. Profit preserved. No equity partner needed. The investor’s cash-on-cash return on their actual capital deployed is dramatically higher than if they’d written a $45,000 check.

Who Should Use This House Flipping Calculator

This tool is useful whether you’re analyzing your first deal or your fiftieth. Fix and flip calculators estimate net profit and ROI, and this one adds the funding dimension that most skip.

• New fix and flip investors who want to sanity-check deals before committing capital and avoid their first loss. The calculator forces diligence on every cost line, so you don’t learn expensive lessons the hard way.
• Experienced flippers comparing multiple deals side by side and optimizing capital structure for better ROI. When you can calculate the gap on three properties in five minutes, you pick the deal with the strongest margin - not just the one that “feels right.”
• BRRRR investors converting flips to rentals who need to model the rehab and refinance portions accurately. The purchase, rehab, and holding math is identical; only the exit strategy changes.
• Small business owners and contractors who flip homes as a side business and need extra working capital to scale without draining their operating accounts.

Key Metrics Our Calculator Surfaces (and How to Interpret Them)

Understanding what the numbers mean is just as important as generating them. This section teaches you to read results like an experienced underwriter.

Total Project Cost

Total project cost includes purchase, repairs, and holding/selling costs - every dollar that leaves your pocket or gets charged to your loan from acquisition through resale. Calculators analyze purchase price, renovation expenses, and selling costs to build this figure.

Compare total project cost to ARV. If your total cost is 85% of ARV or higher, the deal has dangerously thin margins. Aim for at least a 10–15% net margin after all costs. A typical holding cost can include property taxes and insurance, and these recurring charges compound over time, so always run the numbers at your realistic holding period, not the optimistic one.

Profit, Margin, and Cash-on-Cash Return

Profit equals ARV minus total project cost. Profit margin equals profit divided by ARV. These tell you how much room you have if something goes wrong.

Cash-on-cash return uses the investor’s actual cash invested - after layering in gap funding - as the denominator. This is the metric that reveals how efficiently you’re deploying your own money. In 2024–2026 markets, many experienced flippers target a minimum 15–20% profit margin and 25%+ annualized cash-on-cash return. Below those thresholds, the risk-reward ratio starts working against you.

Funding Coverage & Gap Amount

“Coverage” is the percentage of total project cost financed by primary lenders (hard money, DSCR) versus what comes from your own cash or gap capital. The “gap amount” equals your down payment plus closing costs plus reserves minus whatever the lender funds.

This metric is the starting point for talking with Gap Funded about unsecured loans, credit card stacking, HELOCs, and lines of credit and for understanding the real gap funding requirements you need to qualify. Once you know the gap in dollars, you can build a capital stack around it instead of walking away from a profitable deal.

Risk Signals: ARV Sensitivity and Timeline Risk

The calculator can model ARV reductions and longer holding periods to stress-test deals. Try dropping ARV by 5–10% and adding 3 months to your timeline. If profit disappears, the deal doesn’t have enough margin of safety.

Example: on a $300,000 ARV flip with $30,000 projected profit, a 7% ARV decline wipes out $21,000 of that profit instantly; understanding how to fund a fix and flip with no money out of pocket becomes critical when your margins are this tight. Add a 3-month delay at $2,000/month in holding costs and loan interest, and you’re looking at a $3,000 gain - or a loss. Deals that can’t survive a modest ARV dip and a timeline overrun simultaneously are deals you should walk from.

Common Mistakes When Running House Flip Numbers (and How This Calculator Helps)

Even experienced investors sometimes guesstimate and pay the price. Accurate estimates depend on inputs like repair costs and ARV, and cutting corners on inputs means the math is worthless no matter how sophisticated the calculator.

Mistake #1 – Ignoring all holding costs

• People forget property taxes, insurance, utilities, and HOA. Calculators help track holding costs like taxes and insurance, and this one forces those fields to be filled or estimated so nothing slips through.

Mistake #2 – Underestimating rehab

• Relying on rough per-square-foot numbers instead of contractor bids leads to budget blowouts. The calculator encourages a detailed rehab budget and a contingency percentage. For structural or older-property work, input a 15–20% buffer.

Mistake #3 – Overestimating ARV

• Using optimistic comps instead of conservative, recent ones is the single most common reason flips fail. Underwrite conservatively: pull photos and data on sold comps, not just listings. Adjust your ARV down if the market is softening.

Mistake #4 – Misunderstanding what lenders actually finance

• Many new investors assume 100% financing exists. It rarely does. The calculator breaks out lender coverage versus cash and gap requirements so you see the real number before you’re committed.

Mistake #5 – Not planning the capital stack

• Thinking only in terms of one loan leaves money on the table or kills deals entirely. This calculator connects the dots between the numbers and the Gap Funded funding solutions that can close your gap.

How Gap Funded Can Help You Cover the Gap the Calculator Reveals

Once you know your gap amount, the question becomes how to fund it without giving up equity or putting a second lien on the deal property, which is where institutional gap funding solutions for real estate projects come into play.

Unsecured personal term loans are the fastest tool for down payments, closing costs, and initial rehab draws. Typical amounts range from $20,000 to $120,000 depending on credit profile and income. Funding can happen in 1–3 days, and there’s no lien on the investment property.

Business credit card stacking at 0% lets you open multiple business credit cards with 0% introductory APR periods of 12–21 months. Used for materials, contractor payments, and direct purchases, these cards can quickly create $50,000–$150,000 in available credit with zero interest cost during the flip. Foundation requirements: personal credit above approximately 700, an EIN, and a business credit profile.

HELOCs and home equity solutions work for investors with equity in a primary residence or existing rental property. Average HELOC rates sit around 7–8% in 2026. Best used as a reserve or backup line rather than a primary funding source, especially since variable rates and stricter underwriting (720+ credit, reserve requirements) can create friction.

Business lines of credit and working capital are available for established flippers with 2+ years of business history and revenue over $20,000 per month. Limits typically range from $50,000 to $250,000, with interest charged only on drawn amounts. Funding timeline: 1–7 days.

The recommended layering order: start with an unsecured term loan for immediate capital needs, build business credit through card stacking, then add a HELOC as reserve capital once the other tools are in place. Every product carries no equity split and no lien on the flip property. A soft credit pull at the pre-qualification stage means checking your options won’t hurt your score.

Pricing & How to Get Pre-Qualified for Gap Funding

The calculator is completely free. Gap Funded’s funding products carry varying rates and terms based on your credit profile, business history, and deal structure.

Entry-Level Funding – For New Flippers

If you’re working on your first or second flip, typical funding starts with $20,000–$75,000 in unsecured term loans and 0% business credit cards. Qualification is based on personal credit (generally 650+), verifiable income, and reasonable debt-to-income ratios. This tier is designed to get you from “I found a deal” to “I closed it” without requiring years of experience.

Scaling Funding – For Growing Investors

Investors doing multiple deals per year can access higher stacked limits through multiple business credit cards, larger unsecured loans, and business lines of credit. Borrowers with 2+ years in business and $20,000+ per month in revenue unlock working capital products with revolving access - meaning you draw what you need, pay interest only on what’s drawn, and recycle capital deal to deal.

Custom Capital Stacks – For High-Volume Operators

Experienced investors running frequent flips, building BRRRR portfolios, or pursuing small developments benefit from tailored stacking strategies. Gap Funded works with you to build a capital stack that matches your deal flow, closing timelines, and risk profile. Fast execution is the priority - because in competitive markets, deals don’t wait.

Frequently Asked Questions About the House Flipping Calculator & Gap Funding

These are the most common questions we hear from investors using the calculator and exploring gap funding for the first time.

Get Your Flip Numbers (and Funding Plan) Dialed In Today

No more guessing on profit, cash needed, or funding gaps. The calculator above gives you complete visibility into every cost, every dollar of lender coverage, and the exact gap you need to close.

Here’s your next move:

• Scroll up and run your flip scenario in the calculator now
• Note the gap amount and your projected profit
• Click through to complete Gap Funded’s quick funding application for a personalized capital stack

There are no equity splits. No liens on the flip property. No impact on your credit just to see your options.