Free Vig & Overround
Calculator 2026

Vig (vigorish or juice) is the bookmaker's commission built into the odds. It ensures the bookmaker profits regardless of the outcome. On a coin-flip market, a fair book would offer 2.00 on both sides. A book with 5% vig offers 1.90 on both.

Overround Formula: (1/Odds1 + 1/Odds2 − 1) × 100 = Overround %

Vig Formula: 1 − (1 / Total Implied Probability) = Theoretical Hold %

The lower the vig, the better for bettors. Use our Implied Probability Calculator alongside this to find true fair odds.

Your break-even win rate is simply the implied probability of the odds you are betting. At 1.90 (-110), you need to win 52.6% of your bets just to break even. At 1.95, you need 51.3%.

This is why lower-vig bookmakers are dramatically better for long-term profitability. A 2% difference in vig compounds significantly over hundreds of bets. Always shop for the best line using our Arbitrage Calculator to find the highest available odds.

Stake.com — Industry standard for crypto betting. Sharp lines, fast payouts globally.

Polymarket — Peer-to-peer prediction markets. Often the sharpest pricing available.

Stake.com — Low vig, crypto deposits, fast payouts globally.

Polymarket — Prediction market odds often reflect true probability with minimal vig.