An odds calculator converts between different probability formats: decimal odds (European), fractional odds (UK), moneyline/American odds (US), and implied probability. Each format expresses the same underlying probability differently.
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Pro Tip
Always convert odds to implied probability before comparing. A "good" bet is one where the true probability exceeds the implied probability in the odds. This is called having "value."
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Did You Know?
Bookmakers build in a "vig" (vigorish) or "juice" — overround — into their odds, ensuring they profit regardless of outcome. A fair coin flip has 50%/50% probability, but a bookie might offer 52% implied probability on each side (104% total), keeping a 4% margin.
References
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