SellerGains
Margin infrastructure for sellers
Free fee & profit calculators with rates verified against official schedules. No sign-up.
Rates verified 2026-10-01 How we verify fees
Rates verified 2026-10-01 · official schedule
The toolkit
Fee stack
Same $29.99 SKU, six simplified takes from the live fee tables. Lightest cut on this board: Shopify Basic at $1.17.
Bars are relative fee take (lower is lighter). Open a calculator for your weight, category, and ads.
Fee-change alerts — the fee news that hits your margin, within 48h.
Etsy Q4 stays $0.20 listing + 6.5% transaction + 3%+$0.25 processing. Worked $35 Offsite Ads 15%/12% math and USPS Dec 17 last-ship.
Large Standard FBA is $4.60 at 1 lb, $5.82 at 2 lb, and $6.67 at 3 lb on the $10–$50 card, then × fuel. Worked $29.99 calculator math.
After the 6% US referral, a $29.99 SKU’s break-even ROAS jumps when FBT and creator commission stack. Worked calculator math.
The April 17, 2026 FBA fuel surcharge is 3.5% of the fulfillment cell, not the list price. Worked $29.99 Large Standard 1.5 lb math on the $5.42 mid cell.
Crossing $10 leaves Low-Price FBA. Worked $9.99 vs $10.49 math on the 2026 $2.49 / 3.42 / 3.68 4 oz card, plus Beauty’s 8%→15% referral step.
Most-category eBay FVF is 13.6% plus $0.30/$0.40. Worked $29.99 calculator math and the Promoted Listings rate that still clears 25%.
Shopify Payments drops the 2.0–0.6% third-party fee. Worked $49.99 math and the GMV where a Basic→Grow upgrade pays for itself.
Offer a TikTok Shop creator commission that still clears target margin after the 6% referral. Worked $29.99 math, Open vs Target, and a max-rate formula.