6 worked seller guides
Understand the costs behind your price.
Complete examples for platform fees, pricing and advertising. Each guide leads to a calculator where you can use your own numbers.
How Etsy Offsite Ads affect your profit
Compare no fee, 15% and 12% on the same $100 order. Check attribution and the cap.
Read the guide Amazon · USAmazon FBM vs FBA: compare the full order cost
A worked FBM and FBA order explains referral fees, 2026 size and weight rates, fuel surcharge, seasonal storage and selling plan allocation.
Read the guide Shopify · USShopify fees: from checkout revenue to order profit
A complete Shopify US order example separates payment processing, third-party transaction fees, monthly plan and app allocation, and ad break-even.
Read the guide Pricing · Any platformProfit margin vs markup: price from the right base
Use a $100 cost example to compare margin and markup, understand their different bases and calculate a whole-cent price for a 30% target.
Read the guide Advertising · Any platformBreak-even ROAS: what your order can spend on ads
Work through a $100 order with $60 in variable costs. Calculate a 2.5 break-even ROAS, maximum ad cost and the effect of fixed overhead.
Read the guide eBay · Etsy · Amazon · ShopifyCompare selling platforms without hiding the costs
Compare the same $100 order on eBay, Etsy, Amazon FBM and Shopify. Understand tax bases, subscriptions, ads, eligibility and demand before choosing.
Read the guideSources and formulas reviewed 2026-10-04. See supported scopes · Browse all tools.