Betting tools & calculators

Compare your projected win probability to the book's implied probability. Find +EV bets.

Mathematically optimal stake sizing. Supports full, half, and quarter-Kelly.

Multi-leg parlay odds, implied probability, and payout. See what you're really getting.

American, decimal, fractional, and implied probability — one input, all formats.

Strip the vig from any 2-way market. Returns the no-vig fair price and the book's hold.

Lock in profit or minimize loss on a live bet. Sizes the hedge so both outcomes pay equally.

Find arb opportunities between two books. Returns stake split and guaranteed profit.

Two opposing spreads or totals at different lines. Compute the middle window and max payoff.