Free Betting Calculators
8 tools to convert odds, calculate margins, find value, and size bets — across all APAC formats
Odds Converter
Convert between Decimal, American, Hong Kong, Malay and Indonesian odds formats instantly. Essential for APAC bettors comparing lines across sportsbooks.
Parlay Calculator
Calculate combined parlay odds, potential payout and implied probability for multi-leg accumulators. See how vig compounds across legs.
EV & Kelly Calculator
Calculate expected value, betting edge and optimal Kelly criterion stake size. Determine if a bet has positive EV and how much to wager.
Arbitrage Calculator
Find arbitrage opportunities across sportsbooks and calculate optimal stake distribution for guaranteed profit regardless of outcome.
Margin Calculator
Calculate bookmaker margin (vig/juice), fair probabilities and the cost per $1,000 wagered. Compare sportsbook value across markets.
Asian Handicap
Convert Asian handicap lines to win probabilities, understand split-line (quarter) handicaps, and see all possible outcomes with profit/loss for each scenario.
System Bets
Calculate payouts for Trixie, Yankee, Lucky 15, Patent, Heinz, Super Heinz, and Goliath system bets. See total cost, full payout, and breakdown by fold.
Dutching
Calculate optimal stake distribution across multiple selections to guarantee equal profit regardless of which selection wins. Find if dutching is profitable.
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+ |