Guides
The thinking behind the calculators: how each fee schedule really works, how to price for profit, what the loan numbers mean. Every guide is dated, cites its sources, and links to the calculator that does the arithmetic.
eBay fees explained: what a sale really costs in 2026
The final value fee, the per-order fee, the $7,500 tier, promoted listings and the international fee, worked through on real sales so you can see where the money goes.
Etsy fees explained: listing, transaction, processing and Offsite Ads
Four separate fees add up to more than most sellers expect. What each one is, what it's charged on, and a worked example on a $35 order.
How to price a resale item so you actually make money
Work backwards from the profit you want, through fees, shipping and supplies, to the list price. A method, a worked example, and the three costs most sellers forget.
PayPal goods and services vs friends and family: fees, protection and tax
What each payment type costs, who is protected, why asking a buyer to "send as friends" is a bad trade, and how to price so the fee doesn't come out of you.
Poshmark vs Mercari vs Depop: which takes the least from a sale
Three clothing marketplaces, three completely different fee structures. The same item sold on each, at $12, $30 and $80, so you can see which wins at which price.
Shipping for resellers: how to stop losing money on labels
Why the label is usually your second-biggest cost, how weight tiers and zones work, what "free shipping" really costs, and how to charge for it without being undercut.