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Converted formats appear here
Enter odds in any format above.
Convert any odds format instantly — American to decimal, fractional to implied probability. Free tool for US, UK and Canada bettors.
Enter odds in any format above.
American odds are standard in the US and Canada. Decimal odds are used in Europe, the UK, and Australia. Fractional odds are the traditional UK format. All three formats represent the same underlying probability — they're just different ways of expressing the same number. This converter lets you work in whichever format you're comfortable with and instantly see all others.
American odds use a baseline of $100. Negative odds (e.g. -110) show how much you must bet to win $100. Positive odds (e.g. +150) show how much you win from a $100 bet. -110 is the most common line in US sports betting — it represents a slight vig on a roughly 50/50 market. The book takes roughly 4.5 cents per dollar in this standard two-way market.
Decimal odds show your total return per $1 staked, including your original stake. Odds of 2.00 means you double your money. Odds of 1.50 means a $100 bet returns $150 total ($50 profit). Decimal odds are easier for EV calculations because EV = (probability × decimal odds) − 1.
Fractional odds show profit relative to stake. 2/1 ("two to one") means win $2 for every $1 staked. Evens (1/1) is a true 50/50 at no vig — equivalent to +100 American or 2.00 decimal. Fractional odds below 1 (like 1/2) mean you're the heavy favourite — you stake $2 to win $1.
Implied probability is what the bookmaker thinks the true win percentage is — including their vig margin. If you believe the true probability is higher than the implied probability, the bet has positive expected value. Use the EV calculator to quantify exactly how much value you have.
American to decimal: positive odds → (American ÷ 100) + 1; negative odds → (100 ÷ |American|) + 1. Decimal to American: if decimal ≥ 2 → +(decimal − 1) × 100; if decimal < 2 → −100 ÷ (decimal − 1). Implied probability = 1 ÷ decimal odds.
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