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How to Calculate Net Profit in Ecommerce: A Sellers Guide

Learn the exact formula for ecommerce net profit including platform fees, shipping, returns, and ad costs.

By Editorial Team
  • ecommerce
  • net profit
  • accounting
  • seller tips

How to Calculate Net Profit in Ecommerce: A Sellers Guide

Revenue is vanity, profit is sanity. Every ecommerce seller needs a reliable way to calculate net profit across platforms. This guide gives you the exact formula and shows how to apply it whether you sell on Amazon, eBay, Etsy, Shopify, or your own site.

The Net Profit Formula

Net Profit = Revenue - Cost of Goods Sold - Platform Fees - Payment Processing - Shipping Costs - Advertising - Returns - Overhead

Most sellers stop at revenue minus COGS. That is gross profit, not net profit. Net profit is what you actually keep.

Platform Fee Variations

  • Amazon FBA: 15% referral + fulfillment + storage
  • eBay: 13.25% final value + insertion + promoted listings
  • Etsy: 6.5% transaction + 3% payment + $0.20 listing + offsite ads
  • Shopify: Monthly plan + 2.9% payment + app fees
  • Your own site: Payment processing + hosting + no platform fee

Each platform has a different fee fingerprint. A product profitable on Shopify might lose money on Amazon if fulfillment costs are high.

Hidden Costs Sellers Forget

  • Returns and refunds: Apparel sellers often see 15-25% return rates.
  • Packaging and inserts: $0.50 to $2.00 per order.
  • Currency conversion: Selling internationally adds 2-4%.
  • Bookkeeping and tax prep: Easier to track monthly than scramble at year-end.
  • Sample and photography costs: Amortize these across expected units sold.

Using the Calculators

Our suite of seller profit calculators covers Amazon FBA, eBay, Etsy, and dropshipping. Each tool breaks down platform-specific fees so you see net profit per unit instantly.

Monthly Profit and Loss Template

Track these lines every month:

  • Gross revenue
  • Refunds and chargebacks
  • Net revenue
  • COGS
  • Gross profit
  • Platform fees
  • Ad spend
  • Shipping (if not passed to buyer)
  • Software and tools
  • Net profit

Final Thoughts

Net profit is the only metric that matters for sustainability. A store doing $50,000 monthly with 5% net profit earns $2,500. Another doing $20,000 with 25% net profit earns $5,000. Focus on margin, not just scale. Use our calculators to keep your numbers honest.

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