CS2 Trade-Up Contracts Explained: How They Work (2026)

Short answer: a trade-up contract turns 10 skins of the same rarity into 1 random skin of the next rarity tier up. The output’s collection is picked proportionally to which collections your 10 inputs came from, and its float is a weighted average of your inputs’ floats, remapped into the output skin’s own float range. The math generally does not favor the player, most trade-ups lose value once you account for the price gap between rarity tiers, and only pay off if you specifically research and target a real price gap within one collection first.

How a trade-up actually works

Answer: you commit 10 skins of the same rarity tier, and the contract returns exactly 1 random skin from the next tier up, following the same rarity ladder every case follows.

The ladder runs Consumer Grade to Industrial Grade, Industrial to Mil-Spec, Mil-Spec to Restricted, Restricted to Classified, and Classified to Covert. All 10 inputs need to be the same rarity, though they can come from different collections and weapons. You lose all 10 input skins regardless of what comes out, so the value of a trade-up depends entirely on whether the expected value of the output beats what those 10 inputs were worth on the market.

How the output skin is actually chosen

Answer: the game picks randomly from every possible next-tier skin across the collections represented in your 10 inputs, weighted by how many of your 10 came from each collection.

If eight of your ten inputs come from Collection A and two from Collection B, the output is far more likely to land in Collection A’s next-tier pool than Collection B’s. This is the entire lever players pull to try to shift the odds: putting all 10 inputs into skins from a single collection concentrates your outcome into that collection’s specific next-tier skins, for better or worse, rather than spreading the odds thin across multiple collections. See our CS2 collections guide for what a collection actually is and how to identify one on the inspect screen.

How the output float gets calculated

Answer: your 10 input floats get normalized to a 0-1 scale, averaged together, then remapped into the specific float range of whichever output skin you land on.

In plain terms: each input float is converted to a percentage of how worn it is within its own possible range, those ten percentages get averaged, and that average percentage is applied to the output skin’s own minimum and maximum float to produce its actual float. Ten pristine, near-0.00 float inputs will produce a near-minimum float output. Ten heavily worn inputs will produce a near-maximum float output. Mixed inputs land somewhere in between, proportionally.

Does the math actually favor the player?

Answer: generally no. The system itself isn’t rigged against you, but market prices usually make trade-ups a losing trade once you factor in what the 10 input skins were actually worth.

A trade-up only turns a profit when the expected value of the output beats your total input cost, and for most random combinations of 10 skins, it doesn’t. The exception is what traders call collection stacking: researching a specific collection where the price gap between its cheap current-tier skins and its valuable next-tier skins is unusually wide, then buying 10 of exactly that collection’s cheapest qualifying skins to concentrate your odds on the valuable output. That’s a real, sometimes-profitable strategy, but it requires active market research before every attempt, not a general property of trade-ups as a mechanic.

A simple example

Answer: ten Mil-Spec skins from one collection, each costing roughly $0.30, total $3.00 invested for one random Restricted-tier skin from that same collection.

If that collection’s Restricted-tier skins average $2.50 across the pool, the trade nets a loss most of the time, since $3.00 in inputs rarely nets less than $2.50 back on average, but variance means any individual attempt could land well above or below that average. The only way to shift the math meaningfully in your favor is finding a collection where the current-tier skins are cheap relative to an unusually valuable next-tier pool, which is exactly the research collection stacking requires.

A separate, higher-stakes version of this same mechanic exists at the top of the rarity ladder too: five Covert-rarity skins can trade up into a knife or a glove instead of a normal weapon skin, see our CS2 gloves guide for what that specific trade-up can actually produce, and our CS2 knife types guide for which of the 20 possible knife models you could actually land, and why some are worth far more than others before any pattern is even considered. We’ve priced out that five-Covert knife trade-up against just buying a cheap knife directly, see our cheapest CS2 knife guide for why the direct purchase usually wins on both cost and certainty.

FAQ

Where to go next

For the fundamentals behind rarity tiers and float, see our beginner’s guide to CS2 skins and our float guide. Our cheapest CS2 knife guide covers whether the five-Covert knife trade-up is actually worth it versus buying direct. And if you’re weighing trade-ups against just opening cases, our CS2 cases price and odds guide covers the other side of that comparison.