The exact drop rates for every rarity, and which cases actually have the highest ROI.
Every standard CS2 case uses the same published odds: ~79.92% blue, ~15.98% purple, ~3.20% pink, ~0.64% red, and ~0.26% for a knife. ROI depends not on these fixed odds but on the current market price of the skins inside — discontinued cases with expensive coverts have the highest expected value. The full breakdown is below.
Valve published the standard case drop rates, and every official case — plus most third-party cases — follows them. Here's the exact breakdown per case opening:
| Rarity | Color | Odds | 1-in-N |
|---|---|---|---|
| Mil-Spec | Blue | 79.92% | ~1 in 1.25 |
| Restricted | Purple | 15.98% | ~1 in 6 |
| Classified | Pink | 3.20% | ~1 in 31 |
| Covert | Red | 0.64% | ~1 in 156 |
| Special / Knife | Gold | 0.26% | ~1 in 385 |
Read that knife number again: roughly 1 in 385 cases yields a knife. That's the cold math behind every "I'll just open until I get a knife" plan.
ROI = the total market value of the skins in a case ÷ the cost of opening it. The rarity odds are fixed, so ROI swings on two things:
This is why discontinued cases, whose skins stop dropping and appreciate, dominate the highest-ROI rankings over time.
The answer changes as market prices move, but the rule is stable: discontinued cases with high-value coverts lead. Because prices shift daily, the highest-ROI picks are always a moving target — which is exactly why we maintain a ranked list based on Steam Market 30-day averages in our best CS2 cases ranking.
For a worked example of the expected-value math, see our case vs buying ROI comparison.
Here's the honest part: the house edge is built into the odds. Over enough openings, the skins you pull are worth less than what you paid to open — that's how case sites and Valve stay in business. You can improve your odds by:
Chasing a knife at 1-in-385 will lose money over time — just read the loss stories on r/GlobalOffensive. Play smart, not desperate.
Roughly 0.26% per case — about 1 in 385 openings. This is the published standard rate and applies across official and most third-party cases.
About 0.64% per case, or roughly 1 in 156 openings. Covert skins are the second-rarest tier, just below the gold/knife tier.
The highest-ROI cases are generally discontinued ones with expensive covert/knife skins, since their skins appreciate once the case stops dropping. Prices move daily, so check our ranked ROI list for current picks.
No — legitimate sites use the same standard odds. Anyone advertising "better odds" or "guaranteed knives" is a scam. The advantage of sites like Hellcase is free cases and deposit bonuses, not changed odds.
Mathematically, no — the house edge means you lose over enough rolls. It's entertainment with a small profit chance. Open free daily cases and high-ROI cases to minimize the edge; see our case vs buying comparison for the full math.
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