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.
Large Standard FBA is $3.73 at 4 oz, $3.95 at 8 oz, and $4.20 at 12 oz on the $10–$50 card, then × 3.5% fuel. Worked $29.99 calculator math.
Beauty & Personal Care referral is 8% at or below $10 and 15% above. Worked $10.00 vs $10.01 math on the 2026 Large Standard 1.5 lb FBA card.
Electronics referral is 8% vs Home & Kitchen 15% in this dataset. Worked $29.99 Large Standard 1.5 lb calculator math.
Extra-Large FBA is $26.33 + $0.38/lb on the $10–$50 card (under $10: $25.56), then × 3.5% fuel. Worked $29.99 calculator math.
Large Bulky FBA is $9.35 + $0.38/lb on the $10–$50 card, then × 3.5% fuel. Worked $29.99 calculator math.
Qualifying US shops sit on 3% referral for 30 days, then return to 6%. Worked $29.99 calculator math.
Small Standard FBA is $3.42 at 4 oz, $3.54 at 8 oz, and $3.96 at 16 oz on the $10–$50 card, then × fuel. Worked $29.99 calculator math.
Grocery & Gourmet referral is 8%→15% @ $15. Worked $14.99 vs $15.01 math on the 2026 Large Standard 1.5 lb card ($5.42 mid, then × fuel).