What this does: Enter the two American odds for a market and this calculator shows the sportsbook’s margin (the vig) and the true no-vig fair odds.

Key takeaways

• The vig is the margin baked into the odds — it’s what you overcome to win long term.
• Lower vig (-105 vs -110) means fairer prices and a lower break-even.
• No-vig fair odds show the price with the margin stripped out.

Vig / no-vig calculator

How it works

Each American price converts to an implied probability. On a fair market the two sides would sum to 100%; sportsbooks price them to sum to more than 100%, and that overround is the vig. Dividing each side by the total removes the margin and gives the no-vig fair odds.

Why this matters

The vig is charged on every bet, win or lose, so shaving it is one of the most reliable edges available. See why reduced juice matters and what low vig is.

FAQ

What is the vig?

The vig (or juice) is the sportsbook’s built-in margin on a market. It is the reason the two sides of a bet don’t add up to a fair 100% — the extra is the book’s edge.

What are no-vig fair odds?

They are the odds with the margin removed, showing the market’s true implied probability. Comparing a book’s price to the no-vig fair price tells you how much value you’re giving up.

How do I lower the vig I pay?

Bet at reduced-juice books. At -105 instead of -110, the margin is roughly halved. See why reduced juice matters.

Related guides

• What is Low Vig?
• Why Reduced Juice Matters
• Sharp Sportsbooks