Free tools
Four calculators that answer the questions a marketplace seller asks before listing anything. Free, no sign-up, nothing to install. The fee rates come from the OnBuy marketplace API, not from a guess.
What do I actually keep on this sale?
Pick your category, enter cost and price, and see commission, VAT, profit, margin and markup on one screen.
How low can I go before I lose money?
Work backwards from cost to the lowest price that still covers fees and VAT, plus the margin you want to hold.
What price actually beats them?
Buyers compare the total, not the item price. See what to charge to beat a rival once postage is counted.
What is my category charged?
Every selling category on the OnBuy marketplace and the commission rate it carries, read from the marketplace's own API.
Why these four
Most pricing mistakes on a marketplace are arithmetic, not strategy. A seller sets a price that looks healthy against cost, forgets that commission is charged on the delivered total rather than the item price, forgets that the price a buyer sees already includes VAT, and ends up holding a listing that wins the Buy Box and loses money on every unit.
Profit tells you what a sale is worth today. The minimum price tells you how far you can be pushed before that sale stops being worth having — and it has to be grossed up from cost, not marked up, because every percentage charge comes off the selling price rather than off what you paid. The delivered price tells you what actually beats a rival, because buyers sort on the total. The category rate is the input all three depend on, and it varies from 7% to 20% depending on what you sell.
Get those four right once and every listing decision afterwards is quick. Get one wrong and it is wrong on every SKU at the same time.
Re-Pricer watches competitor prices on the OnBuy marketplace and moves your listings within the floor and ceiling you set.