A no-vig calculator removes the sportsbook's margin from a betting market to reveal the true probability both sides are actually assigned. It's one of the most useful tools in sports betting and can be used completely free.
Why You Need a No-Vig Calculator
Every sportsbook price has the vig built in. When you see -110/-110 on a spread, you don't know the true probability the market assigns to each side — you only know what the book is charging. The no-vig calculation extracts the true implied probability.
Once you know the no-vig price (say, +105/+105 on each side), you can compare it against what you're being offered elsewhere. If you can get +115 on one side at a different book, you're getting paid better than the true probability — positive EV.
How to Use a No-Vig Calculator
Manual calculation:
- Convert both odds to implied probability
- Sum them
- Divide each by the sum
Example: Both sides at -110
- 110/(110+100) = 52.38% each
- Sum: 104.76%
- No-vig: 52.38/1.0476 = 50.0% each → +100 fair odds
For a -120/+100 market:
- -120: 120/220 = 54.55%
- +100: 100/200 = 50.00%
- Sum: 104.55%
- No-vig -120 side: 54.55/1.0455 = 52.17% → -109
- No-vig +100 side: 50.00/1.0455 = 47.83% → +109
Free No-Vig Tools
Oddible: Automatically calculates no-vig fair odds on every bet you view. No manual calculation needed — the grade shown for each bet is based on no-vig comparison against sharp market prices.
Online calculators: Multiple free web calculators exist (search "no-vig calculator"). These require you to input the two prices manually and will return the no-vig odds.
Your own spreadsheet: The formula is simple enough to build in Google Sheets for any bet you want to analyze.
[Get automatic no-vig calculations on every bet with Oddible →]
