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Reseller ROI Calculator

Estimate net profit and ROI on a flip across eBay, Mercari, Poshmark, Whatnot, Facebook Marketplace, and Etsy using common fee tiers.

Your numbers

Quick start — try a preset

US most categories: 13.6% to $7,500, then 2.35%; $0.30/$0.40 per order

Single-item US order without a Store discount; buyer tax and handling are excluded. Category and seller-status exceptions can change fees. Official seller fees (checked 2026-10-03).

$

What you paid for the item

$

What the buyer pays for the item

$

$0 if free shipping. Most marketplaces charge fees on this too.

$

What you pay for the label

$

Box, tape, supplies, gas to thrift, etc.

Net profit

$20.48

ROI: 204.8%
Margin: 45.5%

Breakdown

Gross revenue (sale + shipping)
$45.00
− Cost basis
-$10.00
− Shipping cost
-$8.00
− Other costs
-$0.00
− eBay fees

13.6% × $45.00 + $0.40 per order = $6.52 (buyer tax excluded)

-$6.52
Net profit
$20.48

These are simplified US estimates, not marketplace quotes. Official sources and check dates appear above for eBay, Mercari, and Poshmark. Whatnot was checked in July 2026. Other marketplace tiers were not re-verified. Rates can vary by category, region, promotion, subscription, and seller status. Buyer tax and taxes on marketplace fees are not entered and are excluded. Always verify the marketplace's current fee schedule.

Why ROI matters more than gross sales

Two resellers can do $5,000/month in gross sales and have wildly different bank balances. The one tracking ROI knows which sourcing trips paid off and which were a wash; the one looking only at top-line sees the same number every month and can't explain why their savings aren't growing.

For example, enter a $40 item sale, $8 buyer-paid shipping, $8 actual shipping cost, $1.50 packing supplies, and a $5 item cost. The standard eBay estimate before buyer tax is $6.93 in fees. From $48 revenue, the estimated profit is $26.57, or 531.4% ROI.

Keep the same $40 item sale and $8 buyer shipping, but change the item cost to $25 and actual shipping to $12. With the same $1.50 packing cost and $6.93 fee estimate, profit is $2.57, or about 10.3% ROI. These are examples using entered costs, not predictions of a sale price or payout.

Used together with our other free tools

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Get the sell-price estimate before you calculate ROI.

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Bulk Value Checker

Triage a whole haul before doing the ROI math one by one.

Whatnot Fee Calculator

See commission, processing, shipping, and tax caveats.

Reseller ROI calculator FAQs

How do I calculate ROI on a reseller flip?
ROI = (sell price − cost basis − shipping − fees − other costs) ÷ cost basis × 100. So a $10 thrift find that nets $30 profit after all costs is 300% ROI. Margin is different: profit ÷ gross revenue. Most resellers track ROI for sourcing decisions and margin for pricing decisions.
Why does my eBay fee seem higher than 13%?
The standard US most-category estimate is 13.6% of item price plus entered buyer shipping up to $7,500, then 2.35% above. Add $0.30 for an order of $10 or less, or $0.40 above $10. On a $50 item plus $10 buyer shipping, that is $8.56 before unentered buyer tax. Category, subscription, and seller-status exceptions can change the final fee.
Is Poshmark really 20%?
For standard US item sales of $15 or more, the seller fee is 20%. Sales strictly below $15 have a $2.95 fee. A $15 sale costs $3.00. Buyer-paid label shipping is excluded from the item-price fee and seller revenue; enter any seller-funded shipping expenses separately.
What about Mercari's payment fee?
The current standard US seller fee is 10% of item price plus buyer-paid shipping, with no separate payment-processing fee. A $30 item plus $5 buyer shipping has a $3.50 seller fee. This estimate assumes a buyer-paid Mercari prepaid label: its shipping price affects the fee, but is not seller revenue. Enter only shipping costs you cover. Buyer Protection is paid by the buyer and is not deducted again as a seller fee.
How are Whatnot seller fees calculated?
For most standard U.S. categories, Whatnot charges 8% commission on the item's final sale price plus 2.9% of the buyer's total order value and $0.30 for payment processing. The processing basis normally includes buyer-paid shipping and tax. This calculator can include shipping, but it excludes buyer tax and any tax charged on Whatnot fees because those amounts are not entered.
Why is local Facebook Marketplace 0% fees?
FB Marketplace only charges fees when shipping is involved (5% with $0.40 minimum). Local pickup transactions are 100% yours. This is one of the highest-margin marketplaces if you can find local buyers — just account for the time cost of meeting up.
What costs am I forgetting?
The big ones beyond marketplace fees: packing supplies (boxes, tape, poly mailers — about $0.50-2 per shipment), sourcing time and gas (allocate $5-10 per haul), photo time, listing time, and your hourly rate. Hobbyists often ignore these; full-time resellers track every minute.
How accurate are these fee calculations?
They are simplified US estimates, not marketplace quotes. Standard eBay, Mercari, and Poshmark schedules were checked on October 3, 2026; Whatnot was checked in July 2026. Other marketplace tiers were not re-verified. Unentered buyer tax, category and subscription exceptions, promotions, and optional services can change the final payout. Check the linked official schedule for your sale.

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Reseller ROI Calculator — eBay, Mercari, Poshmark, Whatnot Fees