A listing just sold at your usual price, but between the platform's cut and payment processing you're not actually sure what landed in your account — before restocking, you want the real number.
Fees = Sale price × (Marketplace fee% + Processing fee%)
Profit = Sale price − Item cost − Fees − Shipping
Marketplace listing/transaction fees and payment processing fees are usually charged separately and both reduce your net proceeds — check your specific platform's current fee schedule, as these vary and change over time.
1 What this calculator does
Calculates true profit per sale after marketplace fees, payment processing fees and any shipping cost you absorb — giving a realistic picture of margin on marketplace platforms like Etsy, eBay or Depop, where headline sale price significantly overstates what actually lands in your account.
2 Formula & professional reasoning
Fees = Sale price x (Marketplace fee% + Payment processing fee%) / 100
Profit = Sale price - Item cost - Fees - Shipping cost
Margin % = (Profit / Sale price) x 100
Marketplace platforms typically charge multiple layered fees — a listing fee, a transaction/marketplace fee (often 5-15% depending on platform), and a separate payment processing fee (typically 2.5-4%) — which combined can take a meaningful bite out of the sale price before any product cost is even considered. Sellers who price based on sale price alone, without accounting for this fee stack, frequently discover their actual margin is much thinner than expected, or even negative once shipping they absorb is included.
3 Worked examples
⚠️ Illustrative example only — not clinical or professional instruction.
Fees = 28x0.095 = $2.66 | Profit = 28-9-2.66 = $16.34Fees = 65x0.095 = $6.18 | Profit = 65-22-6.18-8 = $28.82Fees = 30x0.135 = $4.05 | Profit = 30-19-4.05-6 = $0.954 Sanity check
5 Common errors
| Error | Cause | Consequence | Fix |
|---|---|---|---|
| Forgetting payment processing is separate from marketplace fees | Only accounting for the platform's advertised transaction fee percentage, missing the additional payment processing fee | Understates total fees and overstates real profit | Check your specific platform's fee schedule for both marketplace/transaction fees and payment processing fees — they are usually charged separately |
| Not accounting for 'free shipping' costs | Advertising free shipping to boost conversion without factoring the shipping cost into pricing or margin calculations | Margin is silently eroded by shipping costs that were never priced in | Either build shipping cost into your sale price upfront, or use this calculator's shipping field to see true profit when shipping is absorbed |
| Ignoring listing fees on high-volume, low-price items | Treating marketplace fees as purely percentage-based when a platform also charges a small flat listing fee per item | For low-price items, flat listing fees can represent a disproportionately large percentage of profit | For high-volume, low-price listings, calculate the effective fee percentage including flat listing fees, not just the percentage-based transaction fee |
| Using outdated fee percentages | Calculating profit based on fee rates from a previous year without checking for updates | Marketplace platforms periodically change fee structures — using stale rates gives an inaccurate profit picture | Check your platform's current published fee schedule before relying on this calculator's output for pricing decisions |
6 Reference & regulatory links
7 Professional workflow
Common tools used alongside this one: