Betting calculators (14)
Free calculators for the maths behind a bet. Type the prices off any sportsbook and every number is worked out by Kelly’s engine, the same one that answers in chat, in the API and in AI apps.
- Parlay calculator
What a parlay pays at any stake, its odds, and the chance every leg wins at the prices you type.
- Odds calculator
Any price as American, decimal and fractional odds, the chance it implies, and what your stake pays.
- Payout calculator
What a bet pays at any price and stake: the profit, the total return, and the same price at other stakes.
- Implied probability calculator
The chance a price implies, in every odds format, and where it sits among common prices.
- No-vig calculator
Take the vig out of any market: each side’s fair price and chance, and the book’s hold.
- Break-even calculator
The win rate a price needs to break even, as a record, at nearby prices and after tax.
- Hedge calculator
How much to bet on the other side for the same profit whichever side wins, and both results side by side.
- Arbitrage calculator
Whether the best prices across books add up to under 100%, and how to split a stake so any winner pays the same.
- Kelly criterion calculator
A bet’s expected value at your chance, shrunk toward the market’s no-vig price, and its Kelly stake once you sign in.
- Cash-out calculator
Whether a cash-out offer is fair: the ticket’s value at the market’s no-vig chance now, and what a hedge fixes instead.
- CLV calculator
A bet’s closing-line value: the price you took against the fair, no-vig closing price.
- Bet tax calculator
The tax on a year of betting under the 2026 rules: taxable income after the 90% loss cap, federal and state tax, and the break-even after tax.
- Odds converter
Any price in American, decimal and fractional odds, as a chance, and what it pays.
- Splits calculator
Bets % and money % for each side: how big the average bet is, and what the book makes on each result.