De-vigging means removing the sportsbook’s margin from the odds.
The goal is simple: find the fair price.
Once you know the fair price, you can compare it with other sportsbooks and spot where the value might be.
De-vigging strips out the book’s built-in edge so you can estimate the true probability of each outcome.
Why you need to remove the vig
Sportsbooks do not usually give you fair odds.
They build in a margin so the market is tilted in their favour.
If you use those raw odds as the true price, your maths will be off.
That matters for +EV betting.
You are trying to answer:
Is this sportsbook offering a better price than the market says should be available?
A quick example
Say a sharp book has this two-outcome market:
- Lakers: 2.10
- Warriors: 1.75
Convert those to implied probability:
- Lakers: 1 ÷ 2.10 = 47.62%
- Warriors: 1 ÷ 1.75 = 57.14%
- Total = 104.76%
That total is over 100%, so the sportsbook margin is built in.
Removing the margin
To de-vig the market, divide each implied probability by the total.
- Lakers: 47.62 ÷ 104.76 = 45.45%
- Warriors: 57.14 ÷ 104.76 = 54.55%
Now the two sides add up to 100%.
That gives us our fair probabilities.
Turning fair probability back into fair odds
Once you have the fair probability, you can turn it back into fair odds.
Fair decimal odds = 1 ÷ fair probability
- Lakers: 1 ÷ 0.4545 = 2.20
- Warriors: 1 ÷ 0.5455 = 1.83
Those are the fair odds after removing the sportsbook margin.
Where the edge appears
Now you compare those fair odds with other books.
If the fair price on the Lakers is 2.20 and another book is offering 2.40, that is interesting.
You are getting paid more than the market says you should be.
That is the start of a +EV opportunity.
How Edge Hunters handles it
You do not need to de-vig markets manually.
Edge Hunters does this across the odds it tracks, then compares prices so you can see where the edge is.
The important thing is understanding what the software is doing.
It is not guessing. It is comparing prices.
The key takeaway
De-vigging helps you find the fair price.
Once you know the fair price, you can spot when another sportsbook is offering too much.
That is where +EV lives.
Next up: Closing line value Why beating the final price matters.
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