CORTENMethod
For each price, implied probability = 100 / odds. Subtracting 100 from the total of the three probabilities gives the excess built into the prices (the overround). In basic normalisation each probability is divided by that total.
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1X2 probability and margin
calculator
Enter three prices to see the implied probabilities, their total and a simple distribution with the margin removed. The calculation runs only in your browser.
Short answer
The 1X2 margin is the part of the summed implied probabilities (1 / odds) of the three prices that exceeds 100%. The calculator shows the raw probabilities, the margin and the normalised probabilities obtained by dividing each by the total. A normalised probability is a mathematical comparison, not the true probability of the result or a recommendation.
Compare three prices
LOCAL CALCULATIONTotal of implied probabilities—
Normalised 1 / X / 2—
Total above 100% (margin)—
Enter three valid odds. The normalised distribution is not a model prediction.
How to read it
Removing the margin only gives a mathematical comparison. It does not produce the true probability of the outcome or a recommendation.
How to calculate the margin ↗Other tools
Poisson score probability ↗Odds ↔ probability converter ↗Odds movement ↗Sample interval ↗Try it on real data
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Last updated: 28 October 2026 · Responsible: Cortenscore editorial team · Spotted an error? Report a correction. This page is for statistics education; it is not a prediction or betting advice. Example values are synthetic.