Free tools
Betting calculators
Price a bet, size a stake, or check a line in seconds. Every calculator updates as you type and shows the formula behind the number.
Expected Value Calculator
Price the long-run profit or loss of any bet from its odds and your win probability.
Arbitrage Calculator
Split one stake across two books to lock in the same return on either outcome.
No-Vig Calculator
Strip the bookmaker margin from a two-way market to get the fair odds on each side.
Kelly Criterion Calculator
Size each stake for maximum long-term bankroll growth given your edge.
Hedge Calculator
Size a bet on the other side to lock in profit or cap the loss on an open position.
Parlay Calculator
Combine any number of legs to see the total odds and payout of a parlay.
Implied Probability Calculator
Turn American, decimal or fractional odds into the win probability they imply.
Odds Converter
Convert between American, decimal and fractional odds instantly.
Skip the arithmetic
The Smart Lines runs these numbers across every major sportsbook and lists the +EV bets for you.