Amazon FBA vs FBM Calculator
Which fulfillment method is more profitable? Enter product weight, dimensions, and volume to see size tier, fees, and annual profit difference.
Where this fits
This tool lives inside Seller OS and is most useful for sellers and founders.
Product Details
Dimensions & Weight
Size Tier
Small Oversize
Sports equipment, furniture under 70 lbs
FBA vs FBM: Per Unit Profit
FBA
$13.51
Referral + fulfillment fees
FBM
$23.00
You handle shipping
Annual Difference
$1,138.80
FBM (Self-Ship) wins
Self-ship is currently protecting more profit than FBA.
FBM (Self-Ship) is ahead with a Small Oversize item at $40.00 sale price and $12.00 COGS. The current fulfillment choice changes profit by $9.49 per unit, so this is not an operational detail — it is a core margin decision.
What To Do Next
Stick with FBM until you can improve sourcing, reduce dimensions, or raise price enough to absorb FBA fees.
The winner is ahead by $9.49 per unit, which compounds to $1,138.80 a year at 10 units a month.
Run the full Amazon profitability model next if you need to pressure-test PPC, returns, and storage before scaling.
Winning path
FBM (Self-Ship)
Small Oversize size tier
Difference per unit
$9.49
FBM (Self-Ship) advantage per sale
Annual gap
$1,138.80
10 units per month
FBA fee burden
$14.49
Referral plus fulfillment per unit
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