The E-Commerce Seller Fee & Net Profit Calculator computes marketplace transaction deductions, payment gateway fees, and final profit margins across Etsy, Shopify, eBay, and Amazon seller accounts.

### Marketplace Fee Schedules & Deduction Formulas Total customer billing equals item retail price plus buyer shipping ($Total = Price + Shipping$). Platform fee deductions follow official schedule tiers: - Etsy: Deducts $0.20 listing fee + 6.5% transaction fee on total + 3.0% payment processing fee + $0.25 order charge: $$Fee = \$0.20 + (Total \times 0.065) + (Total \times 0.03) + \$0.25$$ - Shopify / Stripe: Deducts standard gateway processing of 2.9% + $0.30: $$Fee = (Total \times 0.029) + \$0.30$$ - eBay: Deducts standard category final value fee of 13.25% + $0.30 insertion/order fee: $$Fee = (Total \times 0.1325) + \$0.30$$ - Amazon: Deducts category standard 15% referral commission: $$Fee = Total \times 0.15$$ - Net Take-Home Profit & Margin: $$\text{Net Profit} = Total - Fee - \text{Cost of Goods Sold (COGS)}$$ $$\text{Profit Margin (\%)} = \left(\frac{\text{Net Profit}}{Total}\right) \times 100$$

### Worked Numeric Example Consider selling a handcrafted ceramic mug on Etsy: - Retail Price: $45.00, Shipping Charged: $5.00 ($Total = \$50.00$) - Cost of Goods Sold (COGS): $14.00 - Fee Calculation: - Listing Fee: $0.20 - Transaction Cut (6.5%): $50.00 \times 0.065 = \$3.25$ - Payment Gateway (3.0% + $0.25): $(50.00 \times 0.03) + 0.25 = \$1.75$ - Total Deductions: $0.20 + 3.25 + 1.75 = \$5.20$ (10.4% of sale) - Take-Home Profit: $50.00 - 5.20 - 14.00 = \$30.80$ ($61.6\%$ net margin)

### In-Browser Processing Note All sales figures, production costs, and profit margin equations calculate entirely inside your browser JavaScript runtime with zero external server transit.