Free tools
Betting calculators
Size every bet, evaluate every price, convert every format. The same maths sharps run — built into clean, instant tools.
Vig / Juice Calculator
Find the bookmaker's built-in margin on a two-way market, and the true fair odds.
What is the ?
The vig (or ) is the commission a bookmaker builds into their odds. On a fair coin-flip both sides would be +100; books offer −110 each, and that gap is their margin.
Why it matters
A market's implied probabilities always sum to more than 100% — the excess is the vig. Lower vig means better value, so comparing the margin across books finds you the sharpest price.
Vig benchmarks
<3%Excellent — Pinnacle, Betfair Exchange
3–5%Good — DraftKings, FanDuel, Bet365
5–8%Average — Most recreational sportsbooks
8%+High — Avoid for serious betting