CS2 Trade Up Contract simulator

Simulate CS2 trade up contracts with the exact in-game mechanics. Trade ten items of the same rarity for one item of the next rarity from the collections of your inputs — or, since the October 2025 update, five Covert items for one ★ knife or gloves. A preview toggle shows every possible outcome with its exact probability, predicted float, and market price, which the real game never reveals.

How the real contract works

• Odds: every input carries an equal share of the roll (1/10, or 1/5 for Covert contracts), split evenly across the next-rarity items of that input's collection. Stacking inputs from one collection stacks its chances.
• Float: each input's float is normalized inside its own skin's float range, the normalized values are averaged, and the average is mapped into the winning skin's range. The output float is fully determined by your inputs.
• StatTrak™: all-or-nothing — ten StatTrak inputs give a StatTrak output, and mixing is not allowed. Gloves can never be StatTrak.
• Souvenirs: souvenir items can be mixed in since the May 2026 update; their souvenir attributes are stripped and the output is always normal quality.

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