Calculators
Betting calculators
All 12 calculators and tools on the site, each with a one-line summary. Every number is worked out by code in your browser.
Calculators
Odds converter
Convert betting odds between American, decimal, fractional and implied probability, and see the payout of any stake.
Parlay calculator
Enter your parlay legs in any odds format to see the payout, the fair chance without margin and how much the operator keeps as legs are added.
Round robin calculator
Pick your teams and parlay size to see how many parlays a round robin makes, what it costs in total and what it pays as results come in.
Hedge calculator
Enter your stake and odds, then see how much to bet on the other side to break even or get the same result either way, and what hedging costs.
Arbitrage calculator
Check if two or three prices form an arbitrage, split your stake across books, and see the return after rounding – plus the risks and the legal question.
Margin / no-vig
Enter two or three prices to see the bookmaker margin (vig), the overround and the hold, and the fair no-vig odds in American and decimal format.
EV calculator
Enter odds, stake and your probability to see the expected value of a bet in dollars and percent, plus the break-even chance for those odds.
Bet payout calculator
Bet calculator: enter American, decimal or fractional odds and a stake to see the payout and profit – or the stake needed to win a target amount.
Odds chart
Printable odds payout and conversion chart: American odds as decimal, fraction and implied chance, plus profit on $100 for common prices.
More tools
Bet journal & Kelly
Log your bets in the browser, track profit, ROI and losing runs, and see what the Kelly criterion says about stake size, with its risks.
50/50 draw odds
Oilers, Leafs or charity 50/50: enter tickets sold and your tickets to see your chance to win, a one-in figure and the expected prize per dollar.
Football squares
Super Bowl squares: how often each box hits by quarter in football score data, the most and least common digit pairs, and the chance of your boxes.