{"id":3281,"date":"2026-11-01T07:11:02","date_gmt":"2026-11-01T07:11:02","guid":{"rendered":"https:\/\/scanflip.ai\/blog\/flip-calculator\/"},"modified":"2026-11-01T07:11:08","modified_gmt":"2026-11-01T07:11:08","slug":"flip-calculator","status":"publish","type":"post","link":"https:\/\/scanflip.ai\/blog\/flip-calculator\/","title":{"rendered":"Flip Calculator: How to Work Out Net Profit Before You Buy"},"content":{"rendered":"<p>You&#039;re standing at a Goodwill rack with an item in your hand and a matching sold comp on your phone. The tag looks cheap, but you still haven&#039;t answered the only question that matters: <strong>what will you keep?<\/strong> A flip calculator should answer that before the item reaches your cart, not after you&#039;ve paid for it and discovered what shipping costs.<\/p>\n<h2>Table of Contents<\/h2>\n<ul>\n<li><a href=\"#what-a-flip-calculator-subtracts-step-by-step\">What a Flip Calculator Subtracts, Step by Step<\/a><ul>\n<li><a href=\"#follow-the-money-through-the-sale\">Follow the money through the sale<\/a><\/li>\n<li><a href=\"#run-buyer-paid-shipping-consistently\">Run buyer-paid shipping consistently<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"#marketplace-fees-compared-on-the-same-sale\">Marketplace Fees Compared on the Same Sale<\/a><ul>\n<li><a href=\"#match-the-fee-to-the-category\">Match the fee to the category<\/a><\/li>\n<li><a href=\"#compare-complete-transactions\">Compare complete transactions<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"#shipping-costs-and-the-15-poshmark-cutoff\">Shipping Costs and the $15 Poshmark Cutoff<\/a><ul>\n<li><a href=\"#compare-the-shipping-choices\">Compare the shipping choices<\/a><\/li>\n<li><a href=\"#know-when-a-cheap-shirt-stops-being-worth-it\">Know when a cheap shirt stops being worth it<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"#why-sold-comps-overstate-what-you-keep\">Why Sold Comps Overstate What You Keep<\/a><ul>\n<li><a href=\"#adjust-the-estimate-before-calling-it-profit\">Adjust the estimate before calling it profit<\/a><\/li>\n<li><a href=\"#time-changes-the-buying-decision\">Time changes the buying decision<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"#net-profit-is-not-taxable-income\">Net Profit Is Not Taxable Income<\/a><ul>\n<li><a href=\"#keep-the-figures-separate\">Keep the figures separate<\/a><\/li>\n<li><a href=\"#keep-the-evidence-behind-the-numbers\">Keep the evidence behind the numbers<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"#set-your-buy-or-pass-line-before-you-shop\">Set Your Buy-or-Pass Line Before You Shop<\/a><ul>\n<li><a href=\"#build-a-sourcing-card-on-your-phone\">Build a sourcing card on your phone<\/a><\/li>\n<li><a href=\"#test-the-rule-against-completed-sales\">Test the rule against completed sales<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"#using-the-math-at-the-thrift-store-shelf\">Using the Math at the Thrift Store Shelf<\/a><ul>\n<li><a href=\"#follow-the-shelf-sequence\">Follow the shelf sequence<\/a><\/li>\n<li><a href=\"#keep-the-decision-moving\">Keep the decision moving<\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><a id=\"what-a-flip-calculator-subtracts-step-by-step\"><\/a><\/p>\n<h2>What a Flip Calculator Subtracts, Step by Step<\/h2>\n<p>Say the Goodwill tag is <strong>$6<\/strong>, and a comparable item sold for <strong>$42<\/strong>. Those are the starting inputs for this worked example, using the fee structure described in <a href=\"https:\/\/www.ebay.com\/sellercenter\/selling\/seller-fees\">eBay&#039;s seller-fee guidance<\/a>, not a promise that your item will achieve the same result.<\/p>\n<p><strong>Gross sold price<\/strong> is the amount paid for the item itself. <strong>Net profit<\/strong> is what remains after acquisition and selling costs, including fees, postage, and packing. For sourcing purposes, treat that net as an operational estimate before income taxes and any costs you haven&#039;t entered.<\/p>\n<p><figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/scanflip.ai\/blog\/wp-content\/uploads\/2026\/11\/flip-calculator-vase-resale.jpg\" alt=\"A woman holding a vintage floral vase at Goodwill while comparing it to an online sold listing.\" \/><\/figure><\/p>\n<p><a id=\"follow-the-money-through-the-sale\"><\/a><\/p>\n<h3>Follow the money through the sale<\/h3>\n<p>Use this hypothetical transaction to see every deduction. The category rate is an example input, not a universal eBay rate.<\/p>\n<ol>\n<li><strong>Start with matching sold comps.<\/strong> Use the median of recent sold prices for the same model, size, condition, and included accessories. For this example, the expected item revenue is <strong>$42<\/strong>.<\/li>\n<li><strong>Add buyer-paid shipping.<\/strong> The buyer pays <strong>$8<\/strong> toward delivery, bringing total revenue to <strong>$50<\/strong>. That shipping payment isn&#039;t pure profit because you still have to purchase postage.<\/li>\n<li><strong>Subtract the complete platform fee.<\/strong> At the example category rate of <strong>13.25%<\/strong>, the percentage charge rounds to <strong>$6.63<\/strong>. Add the <strong>$0.40<\/strong> per-order charge for a total fee of <strong>$7.03<\/strong>, leaving <strong>$42.97<\/strong>.<\/li>\n<li><strong>Subtract cost of goods.<\/strong> Deduct the <strong>$6<\/strong> purchase price. Your running balance is <strong>$36.97<\/strong>.<\/li>\n<li><strong>Subtract fulfillment costs.<\/strong> Deduct <strong>$4.50<\/strong> for postage, leaving <strong>$32.47<\/strong>, then <strong>$0.50<\/strong> for packing. Estimated operational net profit is <strong>$31.97<\/strong>.<\/li>\n<li><strong>Apply your buying threshold.<\/strong> If your hypothetical minimum is <strong>$20 net<\/strong>, this item clears it, provided the condition and expected sale are credible.<\/li>\n<\/ol>\n<p>The mistake is counting the percentage fee but forgetting the order charge, or deducting postage without first including the shipping payment. Either mistake makes the calculator unreliable even when the sold comp is accurate.<\/p>\n<p><a id=\"run-buyer-paid-shipping-consistently\"><\/a><\/p>\n<h3>Run buyer-paid shipping consistently<\/h3>\n<p>Consider a separate hypothetical garage-sale board game: <strong>$45<\/strong> item revenue, <strong>$9<\/strong> buyer-paid shipping, <strong>$8<\/strong> cost of goods, <strong>$8.25<\/strong> postage, and <strong>$0.75<\/strong> packing. Under <a href=\"https:\/\/www.mercari.com\/us\/help_center\/article\/169\/\">Mercari&#039;s fee policy<\/a>, the <strong>10% selling fee<\/strong> applies to the completed item price plus buyer-paid shipping for listings created or updated from <strong>January 6, 2025<\/strong>.<\/p>\n<p>The running calculation is:<\/p>\n<ul>\n<li><strong>Revenue received:<\/strong> $45 plus $9 equals <strong>$54<\/strong>.<\/li>\n<li><strong>After the platform fee:<\/strong> $54 minus $5.40 leaves <strong>$48.60<\/strong>.<\/li>\n<li><strong>After acquisition:<\/strong> Subtract $8, leaving <strong>$40.60<\/strong>.<\/li>\n<li><strong>After postage:<\/strong> Subtract $8.25, leaving <strong>$32.35<\/strong>.<\/li>\n<li><strong>After packing:<\/strong> Subtract $0.75, leaving <strong>$31.60 net<\/strong>.<\/li>\n<\/ul>\n<p>These examples exclude additional expenses such as paid promotion or unexpected fulfillment charges. Enter those separately rather than treating the displayed net as untouchable money.<\/p>\n<p>The same cost-by-cost discipline matters outside resale. If you&#039;re also evaluating a vehicle purchase, the <a href=\"https:\/\/megaincomestream.com\/how-to-use-an-auto-loan-calculator-to-save-money-on-your-next-car-purchase\/\">auto financing tips from Mega Income Stream<\/a> are a relevant companion resource for thinking through calculator inputs rather than judging a purchase by its headline amount.<\/p>\n<p>For flipping, the habit is simple: <strong>write down every deduction before you decide<\/strong>. A calculator with missing costs is just a faster guess.<\/p>\n<p><a id=\"marketplace-fees-compared-on-the-same-sale\"><\/a><\/p>\n<h2>Marketplace Fees Compared on the Same Sale<\/h2>\n<p><strong>Fees on one $42 sale with $8 buyer-paid shipping<\/strong><\/p>\n\n<figure class=\"wp-block-table\"><table><tr>\n<th>Platform<\/th>\n<th>Fee rule<\/th>\n<th>What to watch<\/th>\n<\/tr>\n<tr>\n<td>eBay<\/td>\n<td>Hypothetical 13.25% category rate on the $50 total, plus $0.40 per order, produces a <strong>$7.03 fee<\/strong><\/td>\n<td>Buyer-paid shipping is included in the fee base<\/td>\n<\/tr>\n<tr>\n<td>Mercari<\/td>\n<td>10% of the $50 item-plus-shipping total produces a <strong>$5 fee<\/strong><\/td>\n<td>Charged only after the item sells<\/td>\n<\/tr>\n<tr>\n<td>Poshmark<\/td>\n<td>20% of the $42 item sale produces an <strong>$8.40 commission<\/strong><\/td>\n<td>Prepaid label provided; ordinary outbound postage isn&#039;t deducted in this example<\/td>\n<\/tr>\n<\/table><\/figure>\n<p>The table is a <strong>worked fee comparison<\/strong>, not a claim that every platform lets you configure shipping identically. Poshmark&#039;s row uses the item sale amount for commission purposes; don&#039;t treat the hypothetical shipping payment as extra seller income there.<\/p>\n<p><a id=\"match-the-fee-to-the-category\"><\/a><\/p>\n<h3>Match the fee to the category<\/h3>\n<p>According to <a href=\"https:\/\/www.ebay.com\/sellercenter\/resources\/seller-updates\/2025-january\/final-value-fee\">eBay&#039;s January 2025 seller update<\/a>, final value fees ranged from <strong>2.5% to 15.3%<\/strong> by category, with a <strong>$0.40 per-order fee above $10<\/strong>, and the fee base included shipping. The same update announced increases of as much as <strong>0.35 percentage points<\/strong> in most categories beginning <strong>February 14, 2025<\/strong>, with books and magazines listed at <strong>15.3%<\/strong> for sellers without a qualifying Store subscription.<\/p>\n<p>That&#039;s why a saved generic rate isn&#039;t enough for a book scanner moving into shoes or a clothing seller picking up electronics. Select the actual category and account arrangement before trusting the result.<\/p>\n<p>Mercari&#039;s row illustrates a different trap: the shipping payment belongs in the percentage-fee calculation. Poshmark&#039;s row illustrates another: commission and fulfillment don&#039;t follow the same structure as a self-shipped sale.<\/p>\n<p>For a closer platform choice, use the <a href=\"https:\/\/scanflip.ai\/blog\/poshmark-vs-ebay-fees\/\">Poshmark versus eBay fee comparison<\/a> to think through the cost structure rather than choosing the marketplace with the strongest-looking sold comp.<\/p>\n<p><a id=\"compare-complete-transactions\"><\/a><\/p>\n<h3>Compare complete transactions<\/h3>\n<p>A lower marketplace fee doesn&#039;t automatically produce the better flip. You still need to know whether comparable buyers pay separately for shipping, whether your item attracts offers, and whether the platform suits its condition and category.<\/p>\n<p>A collectible with a strong specialist audience may justify a different selling route from a basic shirt. Don&#039;t move an item to an unfamiliar platform just because its fee cell looks smaller.<\/p>\n<p>Before using Depop, Whatnot, ThredUp, Amazon, or TikTok Shop in a flip calculator, check that platform&#039;s current fee schedule and selling arrangement. <strong>A rule without a verified number should stay unfilled, not guessed.<\/strong><\/p>\n<blockquote>\n<p><strong>Fee-check habit:<\/strong> Recheck your saved platform assumptions each quarter and whenever a marketplace announces a seller update.<\/p>\n<\/blockquote>\n<p><a id=\"shipping-costs-and-the-15-poshmark-cutoff\"><\/a><\/p>\n<h2>Shipping Costs and the $15 Poshmark Cutoff<\/h2>\n<p><strong>Who pays the label?<\/strong> Answer that before you decide whether the heavy kitchen appliance at an estate sale is a BOLO or something to leave behind.<\/p>\n<p>For a hypothetical purchase costing <strong>$10<\/strong>, with <strong>$38<\/strong> sold comps, <strong>$1.01<\/strong> packing, and a <strong>$7.99<\/strong> label, the buyer-paid and seller-paid versions produce different results. <a href=\"https:\/\/www.mercari.com\/us\/help_center\/topics\/account\/policies\/seller-protection\/\">Mercari&#039;s seller-protection guidance<\/a> also warns that incorrect package size or weight can trigger additional charges and says its prepaid labels include tracking and up to <strong>$200 in shipping protection<\/strong> for loss or damage in transit.<\/p>\n<p><a id=\"compare-the-shipping-choices\"><\/a><\/p>\n<h3>Compare the shipping choices<\/h3>\n<p>Using the Mercari fee structure in this worked scenario:<\/p>\n\n<figure class=\"wp-block-table\"><table><tr>\n<th>Shipping arrangement<\/th>\n<th>Hypothetical calculation<\/th>\n<th align=\"right\">Estimated net<\/th>\n<\/tr>\n<tr>\n<td>Buyer pays the label<\/td>\n<td>$45.99 total revenue minus $4.60 fee, $10 acquisition, $7.99 label, and $1.01 packing<\/td>\n<td align=\"right\"><strong>$22.39<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Seller offers free shipping<\/td>\n<td>$38 revenue minus $3.80 fee, $10 acquisition, $7.99 label, and $1.01 packing<\/td>\n<td align=\"right\"><strong>$15.20<\/strong><\/td>\n<\/tr>\n<\/table><\/figure>\n<p>The net difference isn&#039;t exactly the label amount because the percentage fee changes when shipping revenue changes. That&#039;s why toggling \u201cfree shipping\u201d should recalculate the transaction, not subtract a label from the previous answer.<\/p>\n<p>A compact appliance can still require a large box, padding around protruding parts, and protection for a glass component. Use a scale and your likely packed dimensions, not the item&#039;s bare weight; this guide to <a href=\"https:\/\/scanflip.ai\/blog\/how-to-estimate-shipping-costs\/\">estimating shipping costs<\/a> helps build that habit.<\/p>\n<p><a id=\"know-when-a-cheap-shirt-stops-being-worth-it\"><\/a><\/p>\n<h3>Know when a cheap shirt stops being worth it<\/h3>\n<p>Under <a href=\"https:\/\/poshmark.com\/faq\">Poshmark&#039;s published fee policy<\/a>, sales under <strong>$15<\/strong> incur a <strong>$2.95<\/strong> commission, while sales of <strong>$15 or more<\/strong> incur a <strong>20%<\/strong> commission. In a hypothetical example, a <strong>$5<\/strong> shirt sold for <strong>$14<\/strong> leaves <strong>$11.05<\/strong> after commission and <strong>$6.05<\/strong> after acquisition; sold for <strong>$30<\/strong>, it leaves <strong>$24<\/strong> after commission and <strong>$19<\/strong> after acquisition, before supplies or other seller expenses.<\/p>\n<p>Poshmark provides a prepaid label, so don&#039;t subtract ordinary outbound postage as though you were buying a self-shipped label. Seller-funded offers, shipping discounts, packaging, and applicable extra costs still need their own entries.<\/p>\n<p><strong>Weigh the item and check the box before buying.<\/strong> A flip calculator needs a realistic package, not just an attractive sold price.<\/p>\n<p><a id=\"why-sold-comps-overstate-what-you-keep\"><\/a><\/p>\n<h2>Why Sold Comps Overstate What You Keep<\/h2>\n<p>A sold comp is a past outcome, not a promise. It tells you that a buyer purchased a particular item under particular conditions, not that your stained, untested, or incomplete version will do the same.<\/p>\n<p>The <a href=\"https:\/\/nrf.com\/media-center\/press-releases\/consumers-expected-to-return-nearly-850-billion-in-merchandise-in-2025\">National Retail Federation projected that 19.3% of online sales would be returned in 2025<\/a>. That&#039;s a retail-wide estimate, <strong>not a resale-platform return rate<\/strong>, so don&#039;t paste it into your calculator as your personal expected return percentage.<\/p>\n<p><figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/scanflip.ai\/blog\/wp-content\/uploads\/2026\/11\/flip-calculator-item-appraisal.jpg\" alt=\"A hand holding a smartphone showing an item scanning app next to a returned shipping package.\" \/><\/figure><\/p>\n<p><a id=\"adjust-the-estimate-before-calling-it-profit\"><\/a><\/p>\n<h3>Adjust the estimate before calling it profit<\/h3>\n<p>A stronger calculation makes these adjustments:<\/p>\n<ol>\n<li><strong>Show a range.<\/strong> Read low, median, and high sold prices. Check what separates the outcomes, including condition, completeness, size, and whether accessories were included.<\/li>\n<li><strong>Remove weak comparisons.<\/strong> Drop mismatched items and discount stale or thin comps. A rare sale doesn&#039;t establish dependable demand.<\/li>\n<li><strong>Allow for condition-related downside.<\/strong> Shoes can separate at the sole, electronics can fail under use, and vintage pieces can have damage that photographs poorly. Base any reserve on your own relevant selling records, not an unrelated industry average.<\/li>\n<li><strong>Keep shipping responsibility visible.<\/strong> A comparable transaction with seller-paid delivery isn&#039;t interchangeable with one where the buyer funded the label.<\/li>\n<\/ol>\n<p>Use <a href=\"https:\/\/scanflip.ai\/blog\/recent-sold-prices\/\">recent sold prices<\/a> to identify an achievable outcome, not to find the highest sale that makes the purchase feel justified. Check the details behind the comp before accepting it.<\/p>\n<p><a id=\"time-changes-the-buying-decision\"><\/a><\/p>\n<h3>Time changes the buying decision<\/h3>\n<p><strong>Sell-through rate<\/strong>, or <strong>STR<\/strong>, belongs beside the profit estimate. Compare demand and available supply over a consistent period, then consider how much competition your item will face.<\/p>\n<p>Say, hypothetically, you&#039;re choosing between a <strong>$42<\/strong> item that may sit for <strong>three months<\/strong> and a <strong>$25<\/strong> item with steady sales. The higher sold price can still be the worse buy if it requires testing, awkward storage, repeated offers, and more listing work.<\/p>\n<p>Measure <strong>profit per dollar invested<\/strong> and <strong>profit per hour of sourcing and listing work<\/strong>. ROI helps compare capital efficiency, but it doesn&#039;t tell you how quickly that capital comes back.<\/p>\n<blockquote>\n<p>A death pile isn&#039;t profit waiting to happen. It&#039;s money you&#039;ve already spent on work you haven&#039;t finished.<\/p>\n<\/blockquote>\n<p>Don&#039;t confuse downside-adjusted profit with subtracting an arbitrary penalty from everything. Identify the actual uncertainty, such as an untested function or missing charger, then price the item under that condition.<\/p>\n<p>Before buying, ask: <strong>what does the worst plausible sale look like, and does it still clear my floor?<\/strong><\/p>\n<p><a id=\"net-profit-is-not-taxable-income\"><\/a><\/p>\n<h2>Net Profit Is Not Taxable Income<\/h2>\n<p>Why might a calculator show a hypothetical <strong>$20 profit<\/strong> while your payment records look much higher? Because profit, gross payments, and bank deposits measure different things.<\/p>\n<p>The <a href=\"https:\/\/www.irs.gov\/newsroom\/form-1099-k-faqs-general-information\">IRS Form 1099-K FAQs<\/a> explain that the form reports <strong>gross payments<\/strong>, without subtracting fees, refunds, shipping, discounts, or credits, and that income from selling goods may be taxable even when no form is issued. You need your own records to determine the appropriate taxable amounts.<\/p>\n<p><a id=\"keep-the-figures-separate\"><\/a><\/p>\n<h3>Keep the figures separate<\/h3>\n<p>Track these distinct views of the transaction:<\/p>\n<ul>\n<li><strong>Expected sale proceeds:<\/strong> What you expect the buyer to pay, with shipping handled explicitly.<\/li>\n<li><strong>Operational net profit:<\/strong> What remains after the acquisition and selling expenses you&#039;ve entered.<\/li>\n<li><strong>Tax-reportable revenue:<\/strong> The revenue figure you reconcile under the applicable reporting rules, rather than treating a marketplace payout as the answer.<\/li>\n<\/ul>\n<p>A bank deposit may already reflect marketplace deductions. Your sourcing estimate may include costs you paid somewhere else. Neither automatically equals taxable income, and neither should be substituted for the other during reconciliation.<\/p>\n<p><a id=\"keep-the-evidence-behind-the-numbers\"><\/a><\/p>\n<h3>Keep the evidence behind the numbers<\/h3>\n<p>Save purchase receipts and cost-basis records, refunds and canceled-order details, buyer-paid shipping, supply expenses, and mileage records. Keep personal-item sales distinguishable from stock acquired for resale so their treatment can be reviewed correctly.<\/p>\n<p>A green buying verdict is <strong>not after-tax income<\/strong>. It means the estimated transaction passes your sourcing rule using the inputs you supplied.<\/p>\n<blockquote>\n<p><strong>Recordkeeping rule:<\/strong> Save the evidence when money changes hands, not when you&#039;re trying to remember the purchase at year-end.<\/p>\n<\/blockquote>\n<p>The reporting guidance cited here is U.S.-specific. Sellers elsewhere should check their local rules, and a tax professional familiar with reseller income should confirm how the rules apply to their circumstances; this isn&#039;t tax advice.<\/p>\n<p>Keep a log entry for each purchase with the receipt, purchase date, source store, and eventual sale record. You&#039;ll have something concrete to reconcile instead of rebuilding a year of sourcing from memory.<\/p>\n<p><a id=\"set-your-buy-or-pass-line-before-you-shop\"><\/a><\/p>\n<h2>Set Your Buy-or-Pass Line Before You Shop<\/h2>\n<p>Set your buying threshold before you walk into the store. Otherwise, you&#039;ll keep lowering it to accommodate whatever interesting thing you&#039;re holding.<\/p>\n<p>Use a <strong>minimum dollar net<\/strong> for inexpensive items and a <strong>minimum return on buy cost<\/strong> when the purchase ties up more cash. Neither should excuse an item that requires more work, storage, or risk than you&#039;re prepared to handle.<\/p>\n<p><a id=\"build-a-sourcing-card-on-your-phone\"><\/a><\/p>\n<h3>Build a sourcing card on your phone<\/h3>\n<p>Keep a short note with these fields:<\/p>\n<ul>\n<li><strong>Platform:<\/strong> Where you realistically expect to sell the item.<\/li>\n<li><strong>Minimum net:<\/strong> The amount that makes the work worthwhile after entered expenses.<\/li>\n<li><strong>Maximum packed weight:<\/strong> Your comfort limit for the items and shipping services you handle well.<\/li>\n<li><strong>Decision time limit:<\/strong> How long you&#039;ll investigate before leaving an uncertain find.<\/li>\n<\/ul>\n<p>The card is a constraint, not a motivational message. If you routinely ignore it for interesting vintage pieces, your actual buying rule is \u201cwhatever catches my eye.\u201d<\/p>\n<p>A bulky clearance item can fail even when its sold comp resembles that of a small thrifted collectible. Different packing requirements, storage needs, and testing work make those purchases unequal.<\/p>\n<p><a id=\"test-the-rule-against-completed-sales\"><\/a><\/p>\n<h3>Test the rule against completed sales<\/h3>\n<p>Before trusting a calculator, use it on a small batch of finds and keep the original estimates. Compare those predictions with the completed transactions, including actual postage, accepted offers, and costs you forgot at the shelf.<\/p>\n<p>If estimates are consistently too high, identify the input causing the gap. Raising your minimum may help, but correcting a bad package estimate or unrealistic comp selection is more useful than hiding the problem behind a bigger buffer.<\/p>\n<p>Don&#039;t lower your floor just because the cart is empty. An empty cart costs less than a purchase you already know won&#039;t justify the work.<\/p>\n<p><strong>Before your next store visit, write your minimum net on that phone card.<\/strong> Make the rule while you&#039;re clearheaded, then use it when the rack gets tempting.<\/p>\n<p><a id=\"using-the-math-at-the-thrift-store-shelf\"><\/a><\/p>\n<h2>Using the Math at the Thrift Store Shelf<\/h2>\n<p>A Ross clearance rack or a garage-sale bin, a phone, and a few minutes: that&#039;s where the calculation needs to work. You don&#039;t need a financial model elaborate enough to delay every purchase.<\/p>\n<p><a id=\"follow-the-shelf-sequence\"><\/a><\/p>\n<h3>Follow the shelf sequence<\/h3>\n<ol>\n<li><strong>Check sold comps<\/strong> for the exact item, not merely the same brand.  <\/li>\n<li><strong>Read the median and sales count.<\/strong> Notice whether you have a useful group of comparable transactions or an isolated result.  <\/li>\n<li><strong>Choose your selling platform.<\/strong> Use the marketplace where you can sell and fulfill.  <\/li>\n<li><strong>Apply its fee rules<\/strong>, including any transaction charges relevant to the sale.  <\/li>\n<li><strong>Estimate packed weight and postage.<\/strong> Include protective materials and the box.  <\/li>\n<li><strong>Subtract the tag price<\/strong> and any cleaning, testing, repair, or supply costs.  <\/li>\n<li><strong>Compare the net with your sourcing card.<\/strong> Buy only if both the numbers and the condition pass.<\/li>\n<\/ol>\n<p><figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/scanflip.ai\/blog\/wp-content\/uploads\/2026\/11\/flip-calculator-reselling-guide.jpg\" alt=\"An infographic titled Using the Math at the Thrift Store Shelf, detailing five steps for reselling.\" \/><\/figure><\/p>\n<p>Thin comps, heavy items with low sold prices, unclear condition, and unfamiliar shipping requirements are pass signals. A barcode match doesn&#039;t prove completeness, and a photo match doesn&#039;t prove working condition.<\/p>\n<p>A sourcing app such as ScanFlip AI can bring the comparison and calculation together: it supports <strong>AI photo scan with no barcode needed, barcode scan, and text search<\/strong>, pulls sold comps from eBay, Poshmark, Mercari, Depop, Amazon, Whatnot, ThredUp, Facebook Marketplace, and TikTok Shop, and shows net profit after fees and shipping with a <strong>red\/green flip-or-pass verdict<\/strong> based on your set minimum profit margin. You still need to check weight and condition in hand.<\/p>\n<p><a id=\"keep-the-decision-moving\"><\/a><\/p>\n<h3>Keep the decision moving<\/h3>\n<p>Use the tool to reduce app-switching, not to rationalize a questionable purchase. If you can&#039;t establish what the item is, whether it works, or what it will cost to ship, the missing information belongs in the decision.<\/p>\n<p><strong>Decide in under a minute, and if the math needs longer, pass.<\/strong><\/p>\n<hr>\n<p><a href=\"https:\/\/www.scanflip.ai\">ScanFlip AI<\/a> offers item identification, sold-comp comparisons, and a profit calculator that accounts for fees, shipping, and buy cost before you purchase. Visit it before your next sourcing trip, set your minimum profit margin, and use the flip-or-pass verdict alongside your own condition and package checks.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>You&#039;re standing at a Goodwill rack with an item in your hand and a matching sold comp on your phone. The tag looks cheap, but you still haven&#039;t answered the only question that matters: what will you keep? A flip calculator should answer that before the item reaches your cart, not after you&#039;ve paid for [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3280,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28],"tags":[171,231,117,244,158],"class_list":["post-3281","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-flip-calculator","tag-net-profit-calculator","tag-reseller-profit","tag-reselling-fees","tag-sold-comps"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Flip Calculator: How to Work Out Net Profit Before You Buy<\/title>\n<meta name=\"description\" content=\"A flip calculator subtracts fees, shipping and buy cost from sold prices. 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