Betting Odds Calculator
Convert betting odds between formats and calculate potential payouts
Odds Information
Conversion Results
American Odds:
+100
Decimal Odds:
2.000
Fractional Odds:
1/1
Payout Information:
Potential Win:$100.00
Total Return:$200.00
Implied Probability:50.0%
Fair Value (No Margin):
American:-111
Decimal:1.900
Fractional:9/10
Understanding Betting Odds
American Odds
- • Positive (+150): Profit on $100 stake
- • Negative (-150): Stake needed for $100 profit
- • Common in US markets
- • Based on $100 unit
Decimal Odds
- • Total return per unit wagered
- • Includes original stake
- • Popular in Europe
- • Easy to calculate returns
Fractional Odds
- • Profit relative to stake
- • Traditional UK format
- • Written as 5/1 (five-to-one)
- • Historical horse racing format
Betting Concepts
Implied Probability
The probability of an outcome occurring based on the odds. Used to:
- • Identify value bets
- • Compare to actual probability
- • Understand bookmaker margin
- • Make informed decisions
Bookmaker Margin
The built-in profit margin in odds that ensures bookmaker profit:
- • Also called "vigorish" or "juice"
- • Affects true probability
- • Varies by market/sport
- • Higher in less competitive markets