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Odds Converter
Translate between American, decimal, fractional, and implied probability in one step.
How odds formats work
American odds show how much you win on $100 (positive) or how much you must bet to win $100 (negative). −110 means bet $110 to profit $100. +250 means bet $100 to profit $250.
Decimal odds include your stake in the return. 1.91 at −110 means a $100 bet returns $191 total. Multiply stake × decimal odds to get total payout.
Implied probability is what the price implies about win likelihood before vig. −110 implies 52.38%. Books shade both sides above 50%, so the sum exceeds 100% — that excess is the vig. Use the no-vig calculator to strip it.
FAQ
What does −110 mean?
You bet $110 to win $100 profit. Total payout if you win: $210. The $10 extra over $100 is the sportsbook's vig on a roughly 50/50 market.
Why do American books use this format?
American odds evolved from horse racing. The sign (+/−) immediately tells you whether you're betting a favorite (−) or underdog (+) without needing to read both sides.
How accurate is implied probability?
It reflects the book's view, not the true probability. Books build in vig so both sides sum above 100%. Strip the vig to get a fairer estimate.
What is the difference between decimal 2.00 and +100?
They are the same bet. Decimal 2.00 means you double your money. American +100 means you win $100 on a $100 bet.
More: Calculator hub · Kelly · Parlay · Hedge · No-Vig
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