{
  "name": "Marketplace Math",
  "url": "https://marketplacemath.com",
  "description": "Free marketplace fee, seller profit, margin, and markup calculators with current formulas and transparent sources.",
  "language": "en-US",
  "market": "United States",
  "currency": "USD",
  "access": "Free; no account required",
  "processing": "Calculator inputs and results remain in the visitor's browser.",
  "calculators": [
    {
      "name": "eBay Fee Calculator",
      "url": "https://marketplacemath.com/calculators/ebay-fee-calculator",
      "description": "Estimate eBay final value fees, promoted listing fees, net payout, actual profit, margin, ROI, and target sale price.",
      "reviewed": "July 21, 2026",
      "officialSource": "https://www.ebay.com/help/selling-fees/selling/selling-fees?id=4822",
      "inputs": [
        "Item sale price",
        "Shipping paid by buyer",
        "Sales tax paid by buyer",
        "What you paid for the item",
        "Your shipping cost",
        "Packaging and other costs",
        "Target profit",
        "Final value fee category",
        "Promoted listing rate"
      ],
      "outputs": [
        "estimated profit",
        "estimated fees",
        "net payout",
        "profit margin",
        "return on cost",
        "price for target profit"
      ],
      "assumptions": [
        "Most categories default to 13.6% up to $7,500 and 2.35% above it.",
        "The per-order fee is $0.30 at $10 or less and $0.40 above $10.",
        "Promoted listing fees are modeled as a percentage of item price."
      ],
      "guide": "https://marketplacemath.com/guides/how-much-does-ebay-take"
    },
    {
      "name": "PayPal Fee Calculator",
      "url": "https://marketplacemath.com/calculators/paypal-fee-calculator",
      "description": "Calculate current PayPal business transaction fees, net payment, profit, margin, and the price needed for a target profit.",
      "reviewed": "July 21, 2026",
      "officialSource": "https://www.paypal.com/us/business/paypal-business-fees",
      "inputs": [
        "Item sale price",
        "Shipping paid by buyer",
        "Sales tax paid by buyer",
        "What you paid for the item",
        "Your shipping cost",
        "Packaging and other costs",
        "Target profit",
        "PayPal transaction type",
        "Fixed transaction fee"
      ],
      "outputs": [
        "PayPal fee",
        "estimated fees",
        "net payout",
        "profit margin",
        "return on cost",
        "price for target profit"
      ],
      "assumptions": [
        "PayPal Checkout defaults to 3.49% plus $0.49.",
        "The percentage applies to the full amount processed.",
        "Your inventory and fulfillment costs affect profit but not PayPal's fee."
      ],
      "guide": "https://marketplacemath.com/guides/paypal-business-fees"
    },
    {
      "name": "Stripe Fee Calculator",
      "url": "https://marketplacemath.com/calculators/stripe-fee-calculator",
      "description": "Calculate current U.S. Stripe card, Terminal, ACH, and Link fees, net payout, profit, and the charge needed for a target profit.",
      "reviewed": "July 23, 2026",
      "officialSource": "https://stripe.com/us/pricing",
      "inputs": [
        "Item sale price",
        "Shipping paid by buyer",
        "Sales tax paid by buyer",
        "What you paid for the item",
        "Your shipping cost",
        "Packaging and other costs",
        "Target profit",
        "Stripe payment method",
        "Fixed fee per payment",
        "Percentage fee cap"
      ],
      "outputs": [
        "estimated Stripe fee",
        "Stripe balance after fee",
        "after fee and collected tax",
        "estimated profit",
        "profit margin",
        "price for target profit"
      ],
      "assumptions": [
        "Online domestic cards use 2.9% plus $0.30 per successful transaction.",
        "Manually entered cards add 0.5%; international cards add 1.5%, and currency conversion can add another 1%.",
        "Terminal domestic cards use 2.7% plus $0.05; ACH Direct Debit uses 0.8% capped at $5.",
        "Rates are standard U.S. pricing. Negotiated and country-specific pricing can differ."
      ],
      "guide": "https://marketplacemath.com/guides/stripe-payment-processing-fees"
    },
    {
      "name": "Venmo Fee Calculator",
      "url": "https://marketplacemath.com/calculators/venmo-fee-calculator",
      "description": "Calculate current Venmo business, goods and services, Tap to Pay, and Instant Transfer fees with payout, profit, and target pricing.",
      "reviewed": "July 28, 2026",
      "officialSource": "https://venmo.com/legal/fees/",
      "inputs": [
        "Item sale price",
        "Shipping paid by buyer",
        "Sales tax paid by buyer",
        "What you paid for the item",
        "Your shipping cost",
        "Packaging and other costs",
        "Target profit",
        "Payment received as",
        "Fixed seller fee",
        "Move the remaining balance"
      ],
      "outputs": [
        "estimated profit",
        "seller percentage fee",
        "seller fixed fee",
        "Instant Transfer fee",
        "total Venmo fees",
        "Venmo balance after fees",
        "price for target profit"
      ],
      "assumptions": [
        "Business-profile payments use 1.9% plus $0.10, except Tap to Pay at 2.29% plus $0.09.",
        "Personal-profile payments identified as goods and services use a 2.99% seller transaction fee.",
        "Instant Transfer uses 1.75% with a $0.25 minimum and $25 maximum; standard transfer is free.",
        "Rates apply to U.S. Venmo accounts. Merchant checkout, custom, and future in-app fees can differ."
      ],
      "guide": "https://marketplacemath.com/guides/venmo-business-and-transfer-fees"
    },
    {
      "name": "Square Fee Calculator",
      "url": "https://marketplacemath.com/calculators/square-fee-calculator",
      "description": "Calculate current U.S. Square in-person, online, invoice, keyed, API, and Afterpay fees with payout, profit, and reverse pricing.",
      "reviewed": "July 30, 2026",
      "officialSource": "https://squareup.com/us/en/pricing",
      "inputs": [
        "Item sale price",
        "Shipping paid by buyer",
        "Sales tax paid by buyer",
        "What you paid for the item",
        "Your shipping cost",
        "Packaging and other costs",
        "Target profit",
        "Square payment method",
        "Fixed fee per payment"
      ],
      "outputs": [
        "estimated Square fee",
        "percentage fee",
        "fixed fee",
        "Square balance after fee",
        "after fee and collected tax",
        "estimated profit",
        "profit margin",
        "price for target profit"
      ],
      "assumptions": [
        "Square Free in-person card payments use 2.6% plus $0.15.",
        "Square Free online and invoice card payments use 3.3% plus $0.30; Online API payments use 2.9% plus $0.30.",
        "Manual entry and card-on-file payments use 3.5% plus $0.15; Afterpay uses 6% plus $0.30.",
        "Square Plus and Premium have different rates for some methods. Accounts processing over $250,000 per year may qualify for custom pricing."
      ],
      "guide": "https://marketplacemath.com/guides/square-payment-processing-fees"
    },
    {
      "name": "Amazon FBA Fee Calculator",
      "url": "https://marketplacemath.com/calculators/amazon-fba-fee-calculator",
      "description": "Estimate 2026 Amazon U.S. referral, FBA fulfillment, plan, storage, inbound, payout, profit, and target price.",
      "reviewed": "August 1, 2026",
      "officialSource": "https://sell.amazon.com/pricing",
      "inputs": [
        "Item sale price",
        "Shipping paid by buyer",
        "Sales tax paid by buyer",
        "What you paid for the item",
        "Your shipping cost",
        "Packaging and other costs",
        "Target profit",
        "Referral fee category",
        "Minimum referral fee",
        "2026 FBA non-apparel tier",
        "Allocated storage cost per unit",
        "Inbound placement and shipping per unit",
        "Selling plan",
        "Professional plan cost per unit"
      ],
      "outputs": [
        "estimated profit",
        "referral fee",
        "FBA fulfillment fee",
        "storage and inbound costs",
        "3.5% fuel and logistics surcharge",
        "selling-plan allocation",
        "estimated fees",
        "net payout",
        "profit margin",
        "return on cost",
        "price for target profit"
      ],
      "assumptions": [
        "Most categories use a 15% referral fee with a $0.30 minimum, but category schedules vary.",
        "Displayed non-apparel fulfillment choices use Amazon's official 2026 U.S. schedule; apparel and Low-Price FBA differ.",
        "A 3.5% fuel and logistics surcharge applies to the FBA fulfillment fee from April 17, 2026.",
        "Standard-size storage is $0.78 per cubic foot January through September and $2.40 October through December; allocate it per unit in the input.",
        "Professional is $39.99 per month and must be allocated per unit; Individual is $0.99 per item. Inbound placement and other inventory fees vary by shipment and inventory behavior."
      ],
      "guide": "https://marketplacemath.com/guides/amazon-fba-and-seller-fees"
    },
    {
      "name": "Etsy Fee Calculator",
      "url": "https://marketplacemath.com/calculators/etsy-fee-calculator",
      "description": "Estimate Etsy listing, transaction, payment processing, and Offsite Ads fees with net profit and target pricing.",
      "reviewed": "July 21, 2026",
      "officialSource": "https://www.etsy.com/legal/fees/",
      "inputs": [
        "Item sale price",
        "Shipping paid by buyer",
        "Sales tax paid by buyer",
        "What you paid for the item",
        "Your shipping cost",
        "Packaging and other costs",
        "Target profit",
        "Listing or renewal fee",
        "Etsy Payments rate",
        "Payment fixed fee",
        "Offsite Ads fee"
      ],
      "outputs": [
        "estimated profit",
        "estimated fees",
        "net payout",
        "profit margin",
        "return on cost",
        "price for target profit"
      ],
      "assumptions": [
        "The listing fee is $0.20 and transaction fee is 6.5% of item price plus charged shipping.",
        "U.S. Etsy Payments defaults to 3% plus $0.25 on the total order including tax.",
        "Offsite Ads can add 12% or 15% to attributed orders."
      ],
      "guide": "https://marketplacemath.com/guides/how-much-does-etsy-take"
    },
    {
      "name": "Whatnot Fee Calculator",
      "url": "https://marketplacemath.com/calculators/whatnot-fee-calculator",
      "description": "Estimate Whatnot commission, payment processing, payout, profit, margin, ROI, and target sale price.",
      "reviewed": "July 21, 2026",
      "officialSource": "https://help.whatnot.com/hc/en-us/articles/4847069165965-Whatnot-seller-fees",
      "inputs": [
        "Item sale price",
        "Shipping paid by buyer",
        "Sales tax paid by buyer",
        "What you paid for the item",
        "Your shipping cost",
        "Packaging and other costs",
        "Target profit",
        "Commission category",
        "Payment processing rate"
      ],
      "outputs": [
        "estimated profit",
        "estimated fees",
        "net payout",
        "profit margin",
        "return on cost",
        "price for target profit"
      ],
      "assumptions": [
        "Most U.S. categories use 8% commission on final sale price.",
        "Payment processing is 2.9% of checkout value plus $0.30.",
        "Checkout value usually includes buyer-paid shipping and tax."
      ],
      "guide": "https://marketplacemath.com/guides/whatnot-seller-fees"
    },
    {
      "name": "Depop Fee Calculator",
      "url": "https://marketplacemath.com/calculators/depop-fee-calculator",
      "description": "Calculate current U.S. Depop payment processing and optional boosted-listing fees with net profit and target price.",
      "reviewed": "July 21, 2026",
      "officialSource": "https://depophelp.zendesk.com/hc/en-gb/articles/360001791127-Seller-fees-and-charges",
      "inputs": [
        "Item sale price",
        "Shipping paid by buyer",
        "Sales tax paid by buyer",
        "What you paid for the item",
        "Your shipping cost",
        "Packaging and other costs",
        "Target profit",
        "Boosted Listing fee"
      ],
      "outputs": [
        "estimated profit",
        "estimated fees",
        "net payout",
        "profit margin",
        "return on cost",
        "price for target profit"
      ],
      "assumptions": [
        "Depop charges no U.S. selling fee.",
        "Depop Payments processing is 3.3% plus $0.45 on item, shipping, and tax.",
        "Boosted Listings for new U.S. listings from March 23, 2026 use a 12% fee when attributed."
      ],
      "guide": "https://marketplacemath.com/guides/depop-seller-fees"
    },
    {
      "name": "Grailed Fee Calculator",
      "url": "https://marketplacemath.com/calculators/grailed-fee-calculator",
      "description": "Estimate Grailed's current tiered seller commission, Stripe processing, payout, profit, margin, and target price.",
      "reviewed": "July 21, 2026",
      "officialSource": "https://support.grailed.com/hc/en-us/articles/30282580172045-What-are-the-fees",
      "inputs": [
        "Item sale price",
        "Shipping paid by buyer",
        "Sales tax paid by buyer",
        "What you paid for the item",
        "Your shipping cost",
        "Packaging and other costs",
        "Target profit",
        "Shipping method",
        "Payment processing rate",
        "Payment fixed fee"
      ],
      "outputs": [
        "estimated profit",
        "estimated fees",
        "net payout",
        "profit margin",
        "return on cost",
        "price for target profit"
      ],
      "assumptions": [
        "Sales under $120 use 6% commission with a $1.99 minimum.",
        "Sales at $120 or more use 9% commission.",
        "U.S. domestic Stripe-onboarded processing is 3.49% plus $0.49."
      ],
      "guide": "https://marketplacemath.com/guides/grailed-seller-fees"
    },
    {
      "name": "Mercari Fee Calculator",
      "url": "https://marketplacemath.com/calculators/mercari-fee-calculator",
      "description": "Estimate Mercari's current U.S. selling fee, payout, profit, margin, ROI, and target sale price.",
      "reviewed": "July 21, 2026",
      "officialSource": "https://www.mercari.com/us/help_center/article/169/",
      "inputs": [
        "Item sale price",
        "Shipping paid by buyer",
        "Sales tax paid by buyer",
        "What you paid for the item",
        "Your shipping cost",
        "Packaging and other costs",
        "Target profit"
      ],
      "outputs": [
        "estimated profit",
        "estimated fees",
        "net payout",
        "profit margin",
        "return on cost",
        "price for target profit"
      ],
      "assumptions": [
        "The selling fee is 10% of item price plus buyer-paid shipping.",
        "No separate payment processing fee is modeled.",
        "Buyer-paid tax is excluded from the seller fee base."
      ],
      "guide": "https://marketplacemath.com/guides/mercari-selling-fees"
    },
    {
      "name": "Poshmark Fee Calculator",
      "url": "https://marketplacemath.com/calculators/poshmark-fee-calculator",
      "description": "Calculate Poshmark seller fees, net earnings, real profit, margin, ROI, and target listing price.",
      "reviewed": "July 21, 2026",
      "officialSource": "https://poshmark.com/fee_policy",
      "inputs": [
        "Item sale price",
        "Shipping paid by buyer",
        "Sales tax paid by buyer",
        "What you paid for the item",
        "Your shipping cost",
        "Packaging and other costs",
        "Target profit"
      ],
      "outputs": [
        "estimated profit",
        "estimated fees",
        "net payout",
        "profit margin",
        "return on cost",
        "price for target profit"
      ],
      "assumptions": [
        "Sales under $15 use a flat $2.95 fee.",
        "Sales of $15 and above use a 20% fee.",
        "The threshold can create a sharp change between nearby sale prices."
      ],
      "guide": "https://marketplacemath.com/guides/how-much-does-poshmark-take"
    },
    {
      "name": "Break-Even Calculator",
      "url": "https://marketplacemath.com/calculators/break-even-calculator",
      "description": "Calculate break-even units and sales revenue after variable costs, marketplace fees, fixed transaction charges, and monthly fixed costs.",
      "reviewed": "July 21, 2026",
      "officialSource": "https://www.sba.gov/business-guide/plan-your-business/calculate-your-startup-costs/break-even-point",
      "inputs": [
        "Fixed costs for the period",
        "Selling price per unit",
        "Variable cost per unit",
        "Marketplace fee rate",
        "Fixed fee per sale",
        "Projected units sold"
      ],
      "outputs": [
        "whole units to break even",
        "break-even sales revenue",
        "contribution per unit",
        "contribution margin",
        "selling fees per unit",
        "profit at projected units"
      ],
      "assumptions": [
        "Contribution per unit = sale price minus variable cost, percentage selling fee, and fixed selling fee.",
        "Break-even units = fixed costs divided by contribution per unit, rounded up to the next whole sale.",
        "Break-even revenue = whole break-even units multiplied by sale price.",
        "All costs, fees, prices, and projected sales must use the same period and currency."
      ],
      "guide": "https://marketplacemath.com/guides/how-to-calculate-break-even-point"
    },
    {
      "name": "Profit Margin Calculator",
      "url": "https://marketplacemath.com/calculators/profit-margin-calculator",
      "description": "Calculate gross profit, net profit, gross margin, net margin, and the revenue required for a target margin.",
      "reviewed": null,
      "officialSource": null,
      "inputs": [
        "Revenue",
        "Cost of goods sold",
        "Operating costs",
        "Target net margin"
      ],
      "outputs": [
        "net profit",
        "gross profit",
        "gross margin",
        "net margin",
        "revenue for target margin"
      ],
      "assumptions": [
        "Gross profit = revenue minus cost of goods sold.",
        "Net profit = gross profit minus operating costs.",
        "Net margin = net profit divided by revenue."
      ],
      "guide": "https://marketplacemath.com/guides/how-to-calculate-profit-margin"
    },
    {
      "name": "Markup Calculator",
      "url": "https://marketplacemath.com/calculators/markup-calculator",
      "description": "Convert cost and markup into selling price, profit, margin, and the price needed for a target margin.",
      "reviewed": null,
      "officialSource": null,
      "inputs": [
        "Item cost",
        "Additional direct cost",
        "Markup",
        "Target margin"
      ],
      "outputs": [
        "selling price",
        "total cost",
        "profit",
        "resulting margin",
        "price for target margin"
      ],
      "assumptions": [
        "Selling price = cost × (1 + markup rate).",
        "Profit = selling price minus total cost.",
        "Margin = profit divided by selling price."
      ],
      "guide": "https://marketplacemath.com/guides/markup-vs-margin"
    }
  ]
}