Reselling Math
Fee and profit calculators for eBay, Mercari, Poshmark, Whatnot and Depop sellers, checked against each marketplace's fee schedule.
- DepopKeeps the mostYou keep $23.33You keepShipping label
- MercariYou keep $21.30−$2.03 vs bestYou keepShipping label
- WhatnotYou keep $21.23−$2.10 vs bestYou keepShipping label
- eBayYou keep $19.57−$3.76 vs bestYou keepShipping label
- PoshmarkYou keep $19.00−$4.33 vs bestYou keepPoshmark fee
Different seller settings? Store level, Whatnot tier and boosting are in the full comparison.
Reselling Math works out what a marketplace takes from a sale and what's left for you once shipping and the cost of the item are paid. Each calculator follows the marketplace's own published fee rules, including the less obvious ones, like fees charged on the shipping your buyer paid or on the sales tax you never see. The rates come from each platform's help pages, not from other calculators.
The calculators
Compare
One marketplace
eBay Fee & Profit Calculator (2026)Fee charged on item + shipping + tax; 15 category tables
Mercari Fee & Profit Calculator (2026)10% of item + buyer-paid shipping
Poshmark Fee & Profit Calculator (2026)$2.95 under $15, 20% from $15
Whatnot Fee & Profit Calculator (2026)Tiered commission from Sep 21, 2026 (new sellers Sep 28)
Depop Fee & Profit Calculator (2026)No selling fee; 3.3% + $0.45 processing
Every fee is compared with the marketplace's fee page on a set schedule, and each calculator shows the date it was last checked. How the fees are checked explains the sources, the rounding and the tests.
| Marketplace | Source | Checked | Next check due |
|---|---|---|---|
| eBay | eBay Help, Selling fees and Store selling fees | ||
| Mercari | Mercari Help Center, Fees on Mercari | ||
| Poshmark | Poshmark Fee Policy v1.7, Seller Fees | ||
| Whatnot | Whatnot Help, Whatnot seller fees (tiered commission from Sep 21, 2026) | ||
| Depop | Depop Help, Seller fees and charges; Boosted Listings Policy |
Get an email when a marketplace changes its fees
When eBay, Mercari, Poshmark, Whatnot or Depop changes a seller fee and we update the calculators, we send one short email saying what changed. Nothing else.
The guides
Beyond the calculators, the fee guides work through the questions a single calculator can't answer on its own — what counts toward each marketplace's fee base, Whatnot's tiered commission, what's changed and when, what a promoted or boosted listing costs, whether an eBay Store pays for itself, what "free shipping" does to each platform's fee, and how to narrow down where to list in the first place.
Before you list
Which Platform to List On, by Item and PriceA decision procedure for choosing among eBay, Mercari, Poshmark, Whatnot and Depop, built from each platform's own category rates and fee thresholds.
Free Shipping or Buyer-Paid? What Happens to the FeeA per-platform table of what folding shipping into "free shipping" does to each marketplace's fee, and where Depop's label choice matters.
How fees are charged
What Each Marketplace Charges Fees OnA side-by-side table of what eBay, Mercari, Poshmark, Whatnot and Depop charge fees on — item price, shipping, tax and flat per-order fees.
Whatnot's Seller Fee Tiers, ExplainedWhatnot's six-vertical, seven-tier commission table, its 28-day rolling window, the September 2026 rollout dates, and what this site doesn't model.
Promoted and Boosted Listings, and What They CostWhat eBay Promoted Listings, Depop's 12% boost and Whatnot's high-value promotion actually charge, and what a paid promotion has to earn back.
Store and changes
Does an eBay Store Pay for Itself?A break-even table for eBay's Store subscription tiers, built from the 13.6% versus 12.7% final value fee split and each tier's monthly price.
What Changed in Marketplace FeesA dated log of four marketplace fee changes this site's saved source pages evidence — Depop, Mercari, Poshmark and Whatnot — each with its effective date.