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No-vig calculator

Enter the price on every side of a market and see how much the sportsbook built in for itself, and what each side's chance is with that margin taken out. Nothing you enter is saved.

Side A (American odds)Side B (American odds)

How it works

Each price implies a chance: −110 is 52.4%, +130 is 43.5%.
Add the chances for every side. The amount over 100% is the book's margin, also called the vig.
Take the margin out and the chances add to exactly 100%. Those are the fair, or no-vig, chances: what the market actually expects.

The calculator takes the margin out by the power method, which CacheOut's game boards use too. Books load more of their margin onto the longshot, so the power method takes more from it than an even split would. No-vig odds explained walks through why.

Common markets

Two-way markets as a sportsbook prices them, with the margin taken out.
Prices	Margin	Favorite fair	Underdog fair	Fair prices
−110 / −110	4.8%	50.0%	50.0%	+100 / +100
−115 / −105	4.7%	51.2%	48.8%	−105 / +105
−120 / +100	4.5%	52.3%	47.7%	−110 / +110
−130 / +110	4.1%	54.5%	45.5%	−120 / +120
−150 / +130	3.5%	58.4%	41.6%	−140 / +140
−175 / +150	3.6%	62.0%	38.0%	−163 / +163
−200 / +170	3.7%	65.1%	34.9%	−186 / +186
−250 / +210	3.7%	69.9%	30.1%	−233 / +233
−300 / +250	3.6%	73.6%	26.4%	−279 / +279
−400 / +320	3.8%	78.7%	21.3%	−368 / +368

Need one price another way? The odds converter turns American odds into decimal and back. For information and analysis only — not betting advice, and not a tipping service. 21+ where permitted. Set a limit before kickoff and keep it. If it stops being fun, stop. Free, confidential help: 1-800-GAMBLER (1-800-426-2537).