Guides
Calculators answer "What is my number?" Guides answer "How should I understand, verify, and use that number?" Start with a guide when you need the reasoning; open the matching calculator when you need the estimate.
Each calculator page also keeps its own methodology, assumptions, formulas, worked examples, limitations, and FAQs below the inputs.
Seller guides
- How to Calculate E-commerce Profit: Complete Guide + Formula — revenue vs profit, cost components, expected-value refunds, a worked example, and common mistakes. Complements the E-commerce Profit Calculator.
- Break-Even ROAS: How to Calculate the ROAS You Need to Be Profitable — contribution before ads, break-even CPA, ROAS vs ACoS, target ROAS, and how to read current ROAS. Complements the Break-Even ROAS Calculator. Related hub: Advertising.
- How to Price a Product for Profit: Margin, Markup & Break-Even Price — selling price vs profit, margin vs markup, break-even and target-margin prices, and discount headroom. Complements the Product Pricing Calculator. Related hub: Pricing.
- Shopify Fees Explained: How to Calculate Your Real Profit per Order — Shopify Payments vs third-party fees, US example rates, expected profit per order, and refunds. Complements the Shopify Profit Calculator. Related hub: Marketplaces.
- Etsy Seller Fees Explained: How to Calculate Your Real Profit — listing, transaction, and US Etsy Payments processing fees, Offsite Ads when they apply, and profit after your costs. Complements the Etsy Fee Calculator. Related hub: Marketplaces.
- TikTok Shop Seller Fees Explained: How to Calculate Your Real Profit — US referral fee, creator affiliate commission when it applies, refund administration fee, and profit after your costs. Complements the TikTok Shop Fee Calculator. Related hub: Marketplaces.
Calculator documentation
Each live tool keeps its documentation on the same page. Open a calculator and scroll past the inputs.
- E-commerce Profit Calculator
- Shopify Profit Calculator
- Break-Even ROAS Calculator
- Product Pricing Calculator
- Etsy Fee Calculator
- TikTok Shop Fee Calculator
Browse the calculators hub to choose a tool by decision type, explore modeled scenarios in analysis, or read site-wide methodology.