Free sports betting calculators
The math behind the ArbWins board, open to anyone. No account, nothing to install, and every result rounds stakes the way a real bettor types them.
- Arbitrage calculatorEnter the best price on each side of a market. See whether the books' prices add up to less than 100%, how much to stake at each, and the profit once stakes are rounded.
- Odds converterType a price in American, decimal, fractional or implied probability and read it in every other format, with what a $100 bet returns.
- No-vig calculatorTake the margin out of a two- or three-way market to see each side's fair probability and fair price. The same method ArbWins uses to price its +EV board.
- Bonus bet calculatorGot a bonus bet from a sportsbook? See the hedge that turns it into cash and how much of it you keep, whichever side wins.
- Hedge calculatorHolding a ticket that has gained value? See the stake on the other side that locks a profit, the stake that gets your money back, and what letting it ride risks.
- EV calculatorEnter a price and a win chance, a fair price or a sharp book's line. See what the bet earns per $100 on average and the win chance it needs to break even.
- Kelly calculatorEnter your bankroll, the odds and a win chance. See the full, half and quarter Kelly stake, and how much growth each one gives up for safety.
- Hold calculatorSee how much a book keeps on a two- or three-way market, and what betting both sides at two books costs when you need to clear a playthrough.
- Parlay calculatorCombine 2 to 8 legs into one price and payout. Add fair odds per leg to see the true chance and how the margin grows with every leg.
- Book settlement rulesHow DraftKings, FanDuel and BetRivers grade overtime, shootouts and player props, and why it decides whether an arb is safe.