🧮 Free Betting Calculators

The math the Desk runs on every board, in your hands: implied probability, fair (no-vig) prices, parlay payouts, hedge sizing, and Kelly stakes. Everything runs in your browser — nothing is stored or sent anywhere.

Implied Probability

What a price says about win chances.

No-Vig Fair Odds

Strip the book's margin from a two-way market.

Odds Converter

American ⇄ decimal ⇄ fractional.

Parlay Calculator

Combined odds and payout for up to 6 legs.

Hedge Calculator

Lock in profit against an open ticket.

Kelly Criterion

Optimal stake size for a perceived edge.

Full Kelly shown with half & quarter — most sharps size down.

These are the same conversions behind our Desk Ratings, Tape scores, and the Shopping Edge column on our futures boards. New to the concepts? Start with Betting 101.