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Betting 101

The Vig: The House's Quiet Tax

4 min read

TL;DR

Both sides of a -110/-110 line imply 52.4% each — 104.8% total. That extra 4.8% is the book's fee. You must be better than the vig, not just better than a coin flip, to profit.

Why both sides add past 100%

Flip a fair coin at a sportsbook and both heads and tails will be priced -110. Each implies 52.4%; together that's 104.8%. Reality only has 100% to give — the overage is the vig (or juice, or hold): the book's built-in margin for hosting the bet.

At -110 you must win 52.4% of your bets just to break even. Winning 51% of your coin flips still loses money.

The vig varies — and that matters

Standard game lines run ~4-5% vig. Player props often carry more (less competition, more book risk), and exotic parlays carry the most. Two practical consequences:

  • The higher the vig, the bigger your edge has to be before a bet is worth making
  • Removing the vig ("no-vig price") shows the book's true opinion — useful when comparing books

How to give the house less

You can't avoid vig, but you can minimize it: shop for the best price on every bet (a -105 instead of -115 on the same prop is a permanent, guaranteed saving), avoid stacking high-vig markets out of habit, and treat parlays as entertainment priced accordingly. Our Market Pulse best-price board shows exactly which book is cheapest on tonight's props.

Keep these

  • -110 both sides = 4.8% built-in house margin
  • Break-even at -110 is 52.4%, not 50%
  • Lower vig via line shopping is a guaranteed, repeatable saving

Up next

Line Shopping: The Cheapest Edge in Betting