Free e-commerce calculators — marketplace fees, profit margins, GST and ad returns, each with steps shown.
Compute referral, fulfillment and storage fees to find net profit per sale.
Calculate final value fees, insertion fees and net profit on every sale.
Shopify Profit Margin Calculator
Factor product cost, shipping, ad spend and fees into true net margin.
Add or remove GST at 5, 12, 18 or 28 percent and see the tax breakup instantly.
Add or remove VAT from any price at any rate.
Work out the sales needed to hit any profit target.
See exactly what Stripe takes and what you keep.
Calculate PayPal fees and your net payout.
Estimate parcel shipping from weight and rates.
Find your turnover ratio and days of stock.
Dropshipping Profit Calculator
True profit per order after costs, ads and fees.
Find how many units you must sell to cover costs.
Compute Etsy transaction, payment and listing fees to find your net profit.
Set wholesale prices from unit cost and target margin.
Estimate customs duty and total landed cost on imports.
Selling online runs on margins — marketplace fees, ad spend, shipping and tax decide whether a sale makes money. Our E-Commerce Calculators collection covers the 15 computations sellers reach for most: Amazon FBA fees, eBay final value fees, Shopify profit margin and GST add/remove. Every calculator shows its steps, so you price with confidence — not guesswork.
Use the search box above to filter the 15 tools instantly, or browse the cards. Each page carries a full explainer — the formula, worked examples with real numbers, common mistakes, and FAQs — at the CalculatorSoup depth standard.
Cite this page as: E-Commerce Calculators, Sigma Calculator, https://sigmacalculator.net/e-commerce-calculators/
Last updated: October 12, 2026