Betting Odds Converter
Convert betting odds between decimal, fractional and American (moneyline) formats, plus Hong Kong, Malaysian and Indonesian odds, implied probability, profit and total return for any stake.
How it works
American +A → decimal 1 + A/100; American −A → decimal 1 + 100/A · fractional a/b → decimal 1 + a/b · decimal d → American +100(d − 1) if d ≥ 2, else −100/(d − 1) · implied probability = 1 ÷ d · Hong Kong = d − 1 · Indonesian = American ÷ 100 · Malaysian = d − 1 if d ≤ 2, else −1/(d − 1)
Every odds format describes the same thing — how much a winning bet returns. Decimal odds (Europe, Latin America, Australia) include the stake; fractional odds (UK and Ireland horse racing) show profit per unit staked; American moneyline odds show the profit on a 100 stake (+) or the stake needed to win 100 (−). Asian books quote Hong Kong, Malaysian and Indonesian odds. The implied probability, 1 ÷ decimal odds, is the break-even win rate; across all outcomes of a market these add up to more than 100% because of the bookmaker's margin.
Worked example
American odds of +150 are 2.50 in decimal and 3/2 in fractional, imply a 40.00% chance, and are 1.50 in Hong Kong and Indonesian format and −0.67 in Malaysian format. A $100 stake wins $150.00 profit for a $250.00 total return.
Sources: Wikipedia — Odds (gambling) · NCPG — Responsible gambling
Frequently asked questions
How do I convert American odds to decimal?
For positive odds divide by 100 and add 1 (+150 → 2.50). For negative odds divide 100 by the number and add 1 (−110 → 1.909, −200 → 1.50).
How do I convert decimal odds to fractional?
Subtract 1 and write the result as a fraction: 2.50 → 1.5 → 3/2; 1.80 → 0.8 → 4/5. Bookmakers round awkward fractions to the nearest standard price.
What does implied probability mean?
It is the win rate at which a bet breaks even: 1 ÷ decimal odds. Odds of 2.50 imply 40%. If you believe the true chance is higher, the bet has positive expected value.
What are evens odds?
Evens (even money) are 1/1 fractional, 2.00 decimal and +100 American: you win the same amount you stake. You can type "evens" into the converter.
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For information and entertainment only — not betting advice. Gambling carries a real risk of loss, odds and settlement rules vary by bookmaker and country, and betting is only for adults where it is legal. Never stake more than you can afford to lose; if gambling stops being fun, get free, confidential help (for example 1-800-GAMBLER in the US, GamCare or BeGambleAware in the UK, or your local helpline).