Betting Calculator
Convert odds, calculate margins, find value \u2014 across all APAC formats
Odds Format Converter
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Decimal
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American
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Hong Kong
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Malay
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Indonesian
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Implied Prob
Parlay / Accumulator Calculator
Add legs to calculate combined parlay odds, potential payout, and implied probability.
Combined Odds—
Potential Payout—
Potential Profit—
Implied Probability—
Hold / Vig—
Expected Value & Kelly Criterion
Enter your odds and the true (fair) probability to calculate expected value and optimal Kelly stake.
Expected Value—
Edge—
Kelly Fraction—
Kelly Stake—
Half-Kelly Stake—
Arbitrage Calculator
Enter decimal odds from different sportsbooks for each outcome to find arbitrage opportunities.
Arb %—
Guaranteed Profit—
Stake on Outcome 1—
Stake on Outcome 2—
Bookmaker Margin Calculator
Enter decimal odds for each outcome to see how much the bookmaker charges you.
Margin—
Fair Home %—
Fair Draw %—
Fair Away %—
What Bookmaker Margin Means For You
Every sportsbook builds a margin (also called "vig" or "juice") into their odds. A 5% margin means the bookmaker keeps $5 of every $100 wagered, regardless of the outcome. Lower margins = better odds = more profit for you over time.
| Margin Level | Typical Books | Cost per $1,000 Wagered |
|---|---|---|
| 1-3% (Sharp) | Pinnacle | $10-30 |
| 4-6% (Average) | Bet365, SBOBET | $40-60 |
| 7-10%+ (High) | Dafabet, 1xBet | $70-100+ |