Odds Conversion Helper
Swap between decimal, fractional and American odds and see the implied chance at a glance.
How to Use This Calculator
- Pick the odds format you’d like to work with by tapping the toggle (Decimal, Fractional, or American)
- Pop your odds value into the input box
- Instantly see the same odds shown in all three formats, along with the implied probability
Examples:
- Decimal: 2.50
- Fractional: 3/2
- American: +150 or -200
Formula
Decimal to Fractional: Fractional = Decimal - 1 (expressed as a fraction)
Decimal to American:
- If Decimal >= 2.00: American = (Decimal - 1) x 100
- If Decimal < 2.00: American = -100 / (Decimal - 1)
Implied Probability: 1 / Decimal Odds x 100%
Frequently Asked Questions
What exactly are decimal odds?
Decimal odds tell you the full amount you get back for every $1 you stake, with your stake included. So odds of 2.50 mean a $1 bet returns $2.50 in total, which is a profit of $1.50.
How do American odds work?
American odds rely on plus and minus signs. A positive number like +150 shows the profit you’d make on a $100 bet, while a negative number like -200 shows how much you’d need to stake to come away with $100 in profit.
Can you explain fractional odds?
Fractional odds such as 3/2 mean you collect $3 in winnings for every $2 you put down. The first figure is your profit and the second is the amount you stake.
What does implied probability mean?
Implied probability turns the odds into a percentage that reflects how likely the bookmaker reckons the outcome is. The shorter the odds, the higher that implied probability climbs.