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How Many Cases Does It Take to Get a Knife in CS2?

The short answer is roughly 385 cases on average. The long answer involves probability curves, varying case costs, and the uncomfortable reality that "average" does not mean "guaranteed." Let us dig into the full picture.

Expected Cases by Confidence Level

Confidence Level	Cases Needed	What This Means
50% chance	~266 cases	Coin flip -- half of players get a knife by this point
75% chance	~532 cases	Three out of four players have seen a knife
90% chance	~885 cases	Nine out of ten players have unboxed at least one
95% chance	~1,150 cases	Only 5% of players are still dry
99% chance	~1,770 cases	Virtually guaranteed, but still not 100%

These numbers come from geometric probability distribution. With a per-case success rate of 0.26%, you can calculate the cumulative probability for any number of openings. The key takeaway: even at 385 cases (the "average"), you only have about a 63% chance of having received a knife.

Cost Breakdown by Case Type

Not all cases cost the same, which dramatically changes the total expected spend.

Case	Case Price	Key Cost	Total per Open	Cost for 385 Opens
Common Active Drop	~$0.05	$2.49	$2.54	~$978
Revolution Case	~$0.30	$2.49	$2.79	~$1,074
Kilowatt Case	~$0.80	$2.49	$3.29	~$1,267
Fever Case	~$1.50	$2.49	$3.99	~$1,536
Bravo Case (Rare)	~$15.00	$2.49	$17.49	~$6,734

Pro Tip: The cheapest path to a knife through case openings is always the cheapest available case. Knife drop rates are identical across all cases -- only the specific knife pool differs.

SEE EXPECTED KNIFE DROP COSTS PER CASE

Real Community Data

Large-scale community unboxing trackers have confirmed these probabilities with remarkable accuracy. Datasets of 100,000 openings consistently show knife rates between 0.24% and 0.28%, centering on that 0.26% figure. Individual streamer results vary wildly -- some get knives within 50 cases, others go 2,000 dry. The math is unforgiving but honest: if you want a knife, buying one outright from the market is almost always cheaper than trying to unbox one.

Stretching Your Budget

If you are determined to unbox rather than buy, here are strategies to maximize your chances within a fixed budget. First, always open the cheapest case available. Since knife odds are identical across all cases, every dollar saved on case cost is another roll of the dice. Second, track your spending religiously -- set a hard limit before you start and walk away when you hit it. Third, consider splitting your budget: spend half on case openings for the thrill and use the other half to buy a knife directly. That way, even if your openings come up empty, you still get the knife you wanted.