CS2 Case Opening Odds Explained: The Real Numbers and the Math
Real CS2 case drop rates from Valve's published odds, plus a full expected value breakdown of the Fever Case. The math says you lose. Here is how much.
CS2 case odds are not a secret, and nobody needs to “analyze thousands of openings” to find them. Valve published the exact numbers in 2017, and they have not changed since. What most guides skip is the second half of the story: what those percentages actually cost you in dollars when you multiply them against real market prices. This article does both. First the published odds, then a complete expected value calculation for the Fever Case using our July 2026 price snapshot, so you can see exactly where your money goes.
Where the odds come from
In 2017, China’s Ministry of Culture required every game sold there to disclose loot box probabilities. Valve complied through Perfect World, its Chinese publishing partner, which published the per-tier drop rates for CS:GO weapon cases on the official Chinese site. Those numbers matched what community trackers had estimated from large samples of recorded openings, and they carried over unchanged into CS2.
These are the same percentages we print on every case page in our cases catalog. They apply to standard weapon cases only: sticker capsules and souvenir packages run on different rarity ladders with their own separately disclosed rates, so nothing in this article’s math transfers to them, and our capsule pages do not reprint weapon-case odds.
The five tiers
| Tier | Color | Drop rate | One drop per |
|---|---|---|---|
| Mil-Spec | Blue | 79.92% | 1.25 cases |
| Restricted | Purple | 15.98% | ~6 cases |
| Classified | Pink | 3.20% | ~31 cases |
| Covert | Red | 0.64% | ~156 cases |
| Rare Special (knife/gloves) | Gold | 0.26% | ~385 cases |
The pattern behind the numbers: each tier is five times rarer than the one below it, except the jump from Covert to gold, which is a 2:5 ratio rather than 1:5. That single design choice is why knives feel so distant. Four out of five openings give you a blue, and the gold tier arrives, on average, once in 385 cases.
Within a tier, every item is equally likely. The Fever Case has 7 Mil-Spec skins, 5 Restricted, 3 Classified and 2 Coverts, so the AWP Printstream specifically drops at 0.64% divided by 2, or 0.32%, one in about 313 openings. The other Covert, FAMAS Bad Trip, gets the same 0.32%.
One more thing the odds do not do: improve. There is no pity timer in CS2. Every opening is an independent roll, and 384 cases without a knife do not make case 385 special.
StatTrak and wear are separate rolls
After the game decides your rarity tier and item, two more rolls happen.
StatTrak. Roughly 10% of eligible drops come out StatTrak. Community tracking puts the empirical figure at 9.83% over a sample of 20,090 recorded openings, close enough to confirm the flat one-in-ten design. Combined with tier odds, a StatTrak knife is a 0.026% event, one in about 3,846 cases.
Wear. The item gets a float value, and the raw roll is heavily weighted toward the middle of the range. Community data on unboxing distributions breaks down like this:
| Wear | Float range | Share of drops |
|---|---|---|
| Factory New | 0.00 - 0.07 | ~3% |
| Minimal Wear | 0.07 - 0.15 | ~24% |
| Field-Tested | 0.15 - 0.38 | ~33% |
| Well-Worn | 0.38 - 0.45 | ~24% |
| Battle-Scarred | 0.45 - 1.00 | ~16% |
The raw float then gets remapped into the specific skin’s allowed range, and some skins have capped ranges that exclude entire wear tiers. How that remap works, and why a 0.07 float can be worth multiples of a 0.08, is covered in our float and wear guide.
Wear is where a huge chunk of the value hides. Take the AWP Printstream from the Fever Case, median prices across the marketplaces we track, July 2026 snapshot:
| Wear | Normal | StatTrak |
|---|---|---|
| Factory New | $238 | $463 |
| Minimal Wear | $81 | $158 |
| Field-Tested | $51 | $86 |
| Well-Worn | $44 | $61 |
| Battle-Scarred | $44 | $57 |
You did not just need to hit the 0.32% Covert roll. To get the $238 version you also needed the ~3% Factory New roll on top. A Factory New Covert from a standard case is roughly a 0.019% event, one in about 5,200 openings.
Expected value: the Fever Case with July 2026 prices
Expected value is the honest way to price a case: multiply each possible outcome by its probability, add everything up, and compare against what you paid. We ran the full calculation on the Fever Case using our July 2026 price snapshot.
Method, so you can check the work: for each of the 17 weapon skins and 24 priced knife finishes we took the median listed price across the marketplaces we track (up to 33 per item), weighted the five wears by the unboxing distribution above, and blended 90% normal with 10% StatTrak. Doppler knives were averaged across phases 1 to 4. Four vanilla knives in the gold pool had no market quotes in the snapshot, so the gold-tier average is computed over the 24 priced finishes.
| Tier | Odds | Avg item value | Contribution to EV |
|---|---|---|---|
| Mil-Spec (7 skins) | 79.92% | $0.17 | $0.14 |
| Restricted (5 skins) | 15.98% | $0.70 | $0.11 |
| Classified (3 skins) | 3.20% | $6.45 | $0.21 |
| Covert (2 skins) | 0.64% | $57.42 | $0.37 |
| Rare Special (knives) | 0.26% | $226 | $0.59 |
| Total expected value | $1.41 |
Now the cost side. The key is $2.49 from Valve. The Fever Case itself traded at a median of about $0.59 across markets in the same snapshot. Total cost per opening: about $3.08.
You pay $3.08 and receive, on average, $1.41 of paper value. That is 46 cents back per dollar.
And “paper value” is generous. Those are listing prices. Sell an unboxed skin on the Steam Market and roughly 13% disappears in fees before the rest lands in a wallet you cannot cash out; sell for actual money and you take a further haircut, a topic we cover in detail in the cash-out guide. Realistic cash recovery per opening sits closer to 35-40 cents on the dollar.
Notice where the value sits. The knife tier you will almost never hit carries $0.59 of the $1.41, and the two Coverts carry another $0.37. Two thirds of the case’s entire worth lives in outcomes with a combined probability under 1%. Meanwhile the Mil-Spec tier, which is what you actually get four times out of five, averages 17 cents an item. A M4A4 Choppa in Field-Tested was listing around $0.10 in the snapshot. That is the modal outcome of your $3.08.
Why you statistically lose
The same numbers, stretched over volume:
| Openings | You spend | Expected return | Expected loss | Chance of at least one gold |
|---|---|---|---|---|
| 1 | $3.08 | $1.41 | $1.67 | 0.26% |
| 10 | $30.80 | $14.10 | $16.70 | 2.6% |
| 100 | $308 | $141 | $167 | 22.9% |
| 385 | $1,186 | $543 | $643 | 63.3% |
| 1,000 | $3,080 | $1,410 | $1,670 | 92.6% |
Read the 385 row carefully, because that is the “average knife” scenario people budget for. You spend $1,186 to reach the point where a knife is more likely than not, and even then it is only a 63% shot, because independent rolls do not owe you anything. The average Fever Case knife pays $226. Everything else you unboxed along the way adds about $317. You are still down more than $600, and that is before selling fees.
The house edge here is structural, not bad luck. The only counterparty making a predictable profit on every opening is Valve, which sells the $2.49 key that started the transaction.
What the gold tier actually pays
“Knife” sounds like a jackpot, but the gold pool has its own lottery inside. The Fever Case pool holds four knife models, Survival, Skeleton, Paracord and Nomad, each in a vanilla version plus six finishes, 28 outcomes total, all equally likely once you hit gold.
The spread is brutal. At the bottom, the Paracord Knife Rust Coat averaged about $53 wear-weighted in our snapshot, with the Survival version right behind at $55. At the top, a Skeleton Knife Doppler averaged around $845 across phases, and a Phase 2 in Factory New listed near $926 median. Doppler pricing is its own subject, phases and gems can multiply a knife’s value several times over, and our Doppler phases guide breaks down how to read them.
So even the 1-in-385 event usually does not make you whole. Add the ~$317 of other drops to your knife and compare against the $1,186 it statistically cost to reach: only the Skeleton Doppler at ~$845 comes within about $25 of breaking even on average, and it takes a good phase or a Factory New float to actually clear the bar. A Skeleton Knife Marble Fade at about $507 still leaves you down, and a Rust Coat pays back under 5% of the journey. The full knife catalog with per-finish prices is in our knives section.
If you open anyway
Opening cases can be a fine way to spend entertainment money, the animation is genuinely fun, and someone has to win the 0.019% Factory New Covert. If that someone might be you, at least stack the decisions in your favor:
- Price the fun honestly. At $3.08 in and $1.41 back, each Fever Case opening costs about $1.67 in expectation. Decide whether the thrill is worth $1.67 to you, the same way you would price a movie ticket.
- Buying beats unboxing, always. A Field-Tested AWP Printstream costs about $51, the expected-loss equivalent of roughly 30 openings. If you want a specific skin, buy the skin.
- Pick a case whose top end you actually want. EV differences between cases are small next to the fixed $2.49 key, so choose by pool: the Kilowatt Case and the Gallery Case carry Kukri knives with the M4A1-S Vaporwave headlining Gallery’s Covert slot, while older drops like Dreams & Nightmares with its AK-47 Nightwish or the Recoil Case offer different Covert pools at different case prices.
- Sealed cases have been the better bet historically. Discontinued cases appreciate as collectible items, which means opening one destroys a real asset to buy a negative-EV lottery ticket. The numbers on that trade are in our skin investment guide.
- Trade-ups give you controlled odds. A trade-up contract has a defined outcome pool you can price before committing, no key fee, and no gold-tier fantasy distorting the math. Our trade-up contract guide walks through profitable setups.
The gambling note
Cases are loot boxes: randomized rewards purchased with real money, with the rare outcomes doing all the psychological work. That is the mechanism regulators in several countries have targeted, and it is the reason the odds in this article exist in public at all.
There is no strategy layer in the opening itself. The odds do not warm up, streaks are noise, and a loss is not an argument for one more key. If you notice yourself opening cases to win back what the last batch cost, that is loss-chasing, and the table above shows where it leads at every volume. Set an amount you are comfortable burning before you buy the first key, and treat any green outcome as luck, not skill. If case opening has stopped feeling like entertainment, the correct number of keys to buy is zero.
Sources
- CSGOSKINS.GG: CS2 Case Odds, the official numbers published by Valve
- SteamAnalyst: CS2 Case Odds and Drop Rates breakdown
- Tradeit.gg: CS2 Case Odds with empirical StatTrak sample
- WeCoach: CS2 Case Drop Rates Guide, unboxing wear distribution
All prices in this article are from our own market snapshot dated July 2, 2026: median listed price across the marketplaces we track, per item, per wear.