Profit Per Unit Calculator
Determine exact net profit per individual item sold. Factor in product wholesale acquisition cost, packaging and fulfillment shipping fees, and marketplace platform transaction commissions to ensure your retail pricing generates genuine bottom-line cash flow.
Customer price collected per unit sold
Wholesale acquisition or direct production cost per item
Packaging box, postage, and warehouse picking fee
Amazon, Shopify, Stripe, or marketplace percentage fee
Clean cash profit remaining after all direct unit expenses
How to Use This Calculator
- Enter the customer retail selling price.
- Enter the unit Cost of Goods Sold (COGS).
- Input pick, pack, box, and postage delivery expenses.
- Specify total marketplace commissions and payment processing fee percentages.
- Review net profit per unit to ensure healthy operating contribution margins.
Formula & Calculation Methodology
Deducts wholesale product expense, outbound fulfillment, and platform merchant processing fees from customer price.
Worked Example
$45 product with $14 COGS, $7.50 fulfillment, and 12% marketplace fee
Frequently Asked Questions
Why do marketplace fees frequently erode e-commerce profit margins?↓
Marketplaces like Amazon, eBay, and Etsy charge referral commissions (typically 8% to 15%) on top of merchant credit card processing fees and optional FBA fulfillment fees, quickly consuming 25% to 40% of retail price.
How does offering "free shipping" impact unit profit?↓
Free shipping transfers outbound delivery fees entirely to the merchant. The retail selling price must be calibrated upward to absorb postage without causing negative unit profitability.
What is a healthy net profit margin per unit in e-commerce?↓
A net contribution margin of 25% to 40% per unit is ideal, leaving adequate capital to cover customer acquisition advertising (CAC) and general corporate overhead.
Should return rate allowances be factored into unit cost?↓
Yes. In high-return categories like apparel (where return rates can reach 20% to 30%), merchants add an estimated return and restocking reserve of 3% to 7% per unit sold.
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Source Citation & Disclaimer
Informational tool only; not licensed tax, legal, or financial advice.