Trade-up calculator

Choose 10 skins of the same rarity. For each outcome, see its chance, its estimated float and the net calculated from current listings.

Prices come from each marketplace’s latest check. They move, so run it again before you buy.

Input rarityStatTrak™ contract

Add a Mil-Spec Grade skin

Your 10 inputs 0/10

Total cost you found (optional)Entered by you: it replaces the theoretical minimum cost in the calculation and is never mixed with observed prices.

Add 10 skins of the same rarity.

How it’s calculated

Float formula, chances, float assumption, fees and outcomes without a price.

Read the method

Float calculated with the rule accepted since 22 Oct 2025, not published by Valve: each input float is scaled to its skin’s range, averaged, then mapped onto the outcome’s range.
Without an exact float we assume the highest one for that wear, so the outcome float has this upper bound. Its resale price isn’t guaranteed.
The purchase price is the wear’s lowest listing, not the price of a copy with that float: we don’t measure that one.
Each input carries 1/10 of the probability, split equally among the next-rarity skins of its collection. With several collections, this is the accepted rule, not published by Valve.
Net resale deducts each marketplace’s seller fees, as on item pages. Buyer and deposit fees aren’t counted: they depend on how you pay.
A loss means a net resale strictly below cost; equal to cost isn’t one.
An outcome with no measured resale price is never counted as 0: above 10% of the probability, nothing is calculated.
Steam credit can’t be withdrawn: it’s never counted as money, and its scenario stays separate.
A Souvenir input is accepted and priced as it is; the outcome is a normal skin.
Veriloot works from public prices: it sells nothing, runs no contract and takes no payment. A contract’s outcome stays random.