Shopify Calculator
Shopify Profit Calculator
See your real profit per item on your own website, VAT accounted for
What you paid for the item
What the customer pays
If you switch this off, postage is treated as "free" (built into your item price above) — but you still pay the real postage cost on the left.
VAT
Switch the second one off for zero-rated items, like most kids' clothing (check gov.uk if you're unsure where an item falls). When it's off, none of the sale price is set aside for VAT, even though you're VAT registered overall. When both are on, 20% VAT is treated as already included in what the customer pays, and it's taken off before working out your profit.
Website & advertising costs
Unlike Etsy or eBay, your own website has no marketplace listing or final value fee — your main costs are payment processing and whatever you spend to bring the customer to the site. Enter roughly what a sale typically costs you in ad spend, and the results below always show your profit both ways.
Monthly subscription (tap to include a share of this per sale)
Leave both at 0 to ignore this. Otherwise, it divides your monthly plan cost evenly across your average orders and adds a small share to each item's fees.