E-Commerce Calculators (2026)

Net profit margin = (Revenue − COGS − Marketplace Fees − Payment Fees − Shipping − Marketing − Taxes) ÷ Revenue × 100. For example, if you sell a $50 product with $20 COGS, $10 in fees/shipping, and $5 in marketing: profit = $15, margin = 30%. Use our E-Commerce Profit Margin Calculator for a full breakdown.

Amazon FBA: 15% referral fee + fulfillment fees. eBay: 13.25% final value fee + $0.30 per order. Etsy: 6.5% transaction fee + $0.20 listing fee + 3%+ payment processing. Shopify: 2.9% + $0.30 if using Shopify Payments (lower with higher plans). Each platform has unique fee structures — use our specialized calculators for exact numbers.

Stripe charges 2.9% + $0.30 per successful transaction for most businesses. International cards add +1.5%, currency conversion adds +1%, and manually entered cards add +0.5%. For a $100 US transaction: fee = $3.20. For a $100 international transaction: fee = $4.70. Use our Stripe Fee Calculator for exact figures.

Key strategies: (1) Increase average order value with bundles, (2) negotiate supplier pricing, (3) reduce return rates with better descriptions, (4) optimize shipping with discounted labels, (5) focus on the 20% of products driving 80% of profit, and (6) raise prices strategically — a 5-10% increase often has minimal impact on conversion rates.