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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