E-Commerce Net Margin & Amazon FBA Fee Calculator

Discover your true bottom-line profit per unit. Factor in factory COGS, inbound freight, Amazon referral fees, FBA pick & pack, blended ad spend (TACoS), and customer return losses before launching a SKU.

Unit Economics Inputs

Retail Selling Price ($)

Factory Cost ($)

Freight to 3PL ($)

Referral Fee %

FBA / Pick & Pack ($)

Target Ad Spend % (TACoS)

Estimated Return Rate %

Calculated Profit Breakdown

Net Profit / Unit

$11.93

Net Margin

29.8%

Landed COGS (Product + Freight):$11.30

Fulfillment & Marketplace Fees:$11.40

Ad Spend Allocated (12%):$4.80

ROI on Product Investment:106%

Target Minimum ROAS:8.33x

Official Excel System

$7.20$9-20%

E-Commerce Net Margin & Multi-Channel Fee Calculator

Amazon FBA size tier fulfillment fees, Shopify Payments, marketplace commissions, returns depreciation, and blended marketing TACoS in Excel.

100% Macro-Free (.xlsx) • Native dynamic formulas

Single-user perpetual license • Zero monthly SaaS

Pre-filled demo workbook + Clean blank sheet

Free Lite (.xlsx)Preview Model

Instant .xlsx Download • Verified IT Safe • Polar Secured