Every odds format, one number.

Odds formats are habits; probability is the substance. A bettor who sees -110 as “52.4%” instinctively asks the right question — does this hit more than 52.4% of the time? — instead of “is this a good line?” Every piece of Whet's math works in probabilities under the hood; the odds are just the wrapper the books put on them.

How do American odds convert to implied probability?

Negative odds: |odds| ÷ (|odds| + 100). Positive odds: 100 ÷ (odds + 100). So -110 implies 52.4% and +210 implies 32.3%. The converter runs these formulas live as you type.

What's the difference between decimal and American odds?

They say the same thing differently. Decimal odds are your total return per $1 staked (2.50 returns $2.50 including the stake). American odds quote profit relative to $100 (-110 risks $110 to win $100; +150 risks $100 to win $150).

Is implied probability the real win probability?

No — it includes the book's vig, so it overstates the true probability. Both sides of a market sum past 100%; the excess is the margin. De-vig the pair (see the no-vig calculator) to get the fair number.