Business topic
Selling Online calculators
Price for profit after marketplace fees, ad spend, and platform costs — understand your take-home before you list.
Reviewed by BoringToolsKit · August 24, 2026 · Planning information, not professional advice.
Selling Online: the big picture
Selling online is a profit-margin business: listing fees, transaction charges, payment processing, shipping, advertising, and product cost all eat into what you actually keep. Most sellers price by markup and get surprised at payout. BoringToolsKit's seller and ecommerce calculators model the full fee stack — Amazon, Etsy, eBay, Shopify, and more — so you can set a price that leaves a real profit, not an estimated one.
- Fees are a percentage of price plus fixed per-item charges.
- Payment processing and shipping can be larger than the listing fee.
- Set your price from the profit you need, not from a markup on cost.
- Enter your selling price, product cost, and shipping.
- Add the platform's listing, transaction, and processing fees.
- See the net profit and the minimum price that keeps it positive.
Worked example: a $24.99 shirt on Etsy
- Step 1: Etsy Fee & Profit Calculator — Enter $24.99 price, $8.00 cost, $5.00 shipping See: Fees around $2.85; net profit lands near $9.15 per shirt
- Step 2: Marketplace Advertising Break-Even Calculator — Set a $0.75 ad cost per order against that margin See: The ad spend stays profitable while the margin covers it
- Step 3: Profit Margin and Markup Calculator — Check the markup from $8.00 cost to $24.99 price See: About a 212% markup — and confirm the margin holds after fees
Numbers depend on the inputs you enter; the walkthrough shows one realistic scenario.