Enter your costs, price, and package size. The calculator works out the size tier, referral fee, FBA pick & pack fee, and monthly storage automatically — then shows your real profit per unit.
Fee data: US marketplace, 2025/2026 base rates · referral, fulfillment & storage are estimates — every auto fee can be overridden.
1Price & product cost
$
$
$
Duties, packaging, inserts, etc.
$
units
Freight from supplier to Amazon, per unit.
$
3PL or prep-center handling you pay outside Amazon. (Amazon's own storage is calculated below.)
2Package size & weight
in
in
in
lb
Amazon charges on the greater of actual weight or dimensional weight (volume ÷ 139). Both are shown in the breakdown.