E-Commerce Unit Formula Summary

Gross Profit = Retail Price - COGS - Packaging
Contribution Margin = Gross Profit - Shipping Costs - Merchant Fees (2.9%+$0.30)
Net Profit per Unit = Contribution Margin - Customer Acquisition Cost (CAC)
Target Net Margin: Healthy e-commerce stores aim for 15% – 25% net margin after all ad spend.

1. The Silent Profit Killers in Direct-to-Consumer

Online store owners often focus exclusively on top-line revenue shown in Shopify or WooCommerce dashboards. However, high top-line revenue without accounting for payment gateway processing fees, pick-and-pack warehouse expenses, return rates, and shipping surcharges leads to negative cash flow.

2. Interactive Margin Calculator

Plug your exact store product numbers into our verified unit margin tool:

E-Commerce Margin & Break-Even Calculator

Instantly compute gross profit margin %, net margin per unit, break-even ROAS, and maximum allowable CPA.