CS2 odds & probability calculators
Four small tools for the arithmetic behind a price. Free, no signup, nothing sent anywhere — every calculation runs in your browser, on the numbers you type.
- prices in → margin-free probabilities and fair odds
No-vig calculator
Strip the margin out of a market and see the fair probabilities and prices underneath — by four different methods, side by side.
- one price → probability, and every other odds format
Implied probability calculator
Turn one price into the percentage chance it represents, and see the same price written in American, decimal and fractional odds.
- prices in → margin, hold, and where the margin sits
Vig calculator
Measure the margin in a market: the booksum, the overround, the hold, and which side of the market is carrying it.
- map probability → series probability and correct scores
Series win probability calculator
Turn a per-map win probability into a series win probability and a full correct-score split — the maths that makes a BO3 different from a BO1.
From a price to a probability
A price is a probability in disguise. Convert one with the implied probability calculator and you get the chance it represents — but add up every outcome in a real market and the total comes to more than 100%. That excess is the margin.
The vig calculator measures it and shows which side of the market is carrying it. The no-vig calculator takes it back out, leaving the fair probabilities and prices underneath — by four different methods, because the choice of method genuinely changes the answer on longshots.
The series calculator is the Counter-Strike one: a per-map edge compounds over a BO3 or BO5, and it works out by how much, along with the full correct-score split.
For the concepts rather than the arithmetic, see the vig explained, converting odds to a probability, and the glossary. The same de-vig maths builds the single CS2 market line we publish — that is documented on our methodology page.
Informational and educational only. 18+. These tools perform arithmetic on figures you enter; they do not recommend any outcome and make no prediction.
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