Ecommerce Profit Calculator
Marketplace fees, VAT, postage, ads — see what a sale really leaves you per unit, before you scale it.
Why sellers overestimate their margin
A £29.99 sale is not £29.99 of revenue: if you are VAT-registered, a sixth of it is VAT; the platform takes its percentage plus a fixed fee; then postage, product cost and advertising come off. Many sellers discover their “profitable” hero product nets pennies — this calculator shows it per unit, honestly.
Multi-channel sellers on Shopify, Amazon, eBay and Etsy: our ecommerce VAT team reconciles the real numbers platform by platform.
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Frequently asked questions
Platform fees (percentage and fixed), payment fees, shipping, cost of goods, advertising spend and u2014 if you are VAT-registered u2014 the VAT inside your selling price.
If you are VAT-registered, a u00a3120 sale contains u00a320 of VAT owed to HMRC, so your real revenue is u00a3100 u2014 the calculator strips this out before working out profit.
After all costs, 10u201320% net margin is typical for UK ecommerce; below 10% usually signals fee or ad-spend problems worth reviewing.