No-Vig Calculator
Enter two opposing American odds (the two sides of any market) and see what the line would be without the sportsbook's vig; the true "fair" price.
Fair (no-vig) line
What is "vig" (or "juice")?
Every sportsbook builds a margin into both sides of a market. On a -110 / -110 spread, you risk $110 to win $100 on either side. The 10% gap is the vig; the sportsbook's commission.
If you sum the implied probabilities of both sides, you'll find they exceed 100%. The excess is the vig:
-110implies a 52.38% chance.- 52.38% + 52.38% = 104.76%.
- The 4.76% over 100% is the vig.
How to remove vig (the math)
- Convert each American odds to implied probability.
- Sum the two implied probabilities.
- Divide each implied probability by the total; this normalizes them to sum to exactly 100%.
- Convert back to American odds.
Why this matters for Arizona bettors
Sharp bettors use no-vig lines to identify value. If your model says a team's true win rate is 55%, but the sportsbook's no-vig fair line implies 52%, you're getting +3% expected value; over time, that's a profitable edge.
It's also useful for comparing books: book A may post a less juiced market than book B even if their nominal odds look similar. The no-vig calculator reveals which book is actually offering the better price.