Bookmaker Margin (Vig) Explained: The Number Most Bettors Never Check

If a coin toss were priced fairly, both sides would be 2.00 — a 50% chance each, adding to exactly 100%. Bookmakers do not price fairly, and they are not hiding it. The gap is the business model.

Working out the margin Take a football match priced 1X2: - Home 2.10 → 1 / 2.10 = 47.6% - Draw 3.40 → 1 / 3.40 = 29.4% - Away 3.60 → 1 / 3.60 = 27.8%

Total: 104.8%. Those extra 4.8 percentage points are the overround, also called the margin or the vig. On a balanced book, that is roughly what the bookmaker expects to keep.

The formula: margin = (sum of implied probabilities) − 100%.

Why it decides your long-run result Margin is a cost you pay on every single bet, whether you win or lose. It compounds relentlessly.

A rough sense of scale in football 1X2 markets: - 2–3% is a sharp, low-margin operator - 5–7% is typical for mainstream bookmakers - 10%+ appears in accumulators, niche markets, and heavily promoted specials

Betting into a 7% market instead of a 3% market means you need to be meaningfully better at predicting just to reach the same break-even point. Most bettors spend enormous effort on picking and none on this.

Where margins are worst The pattern is consistent: the more exotic the market, the higher the cut.

• Match result markets on major leagues: lowest margins, most efficient prices
• Player props, correct score, first goalscorer: much higher
• Accumulators: margins multiply with each leg, which is why they are promoted so heavily. Our accumulator calculator shows you the combined price, and the effect is easier to see than to describe.

What you can actually do about it 1. Compare prices before every bet. The difference between the best and worst available price on the same outcome is frequently larger than any edge you could realistically have. 2. Favour high-liquidity markets — major leagues, main markets — where competition compresses margins. 3. Treat promotions sceptically. A boosted price on a high-margin market is often still worse than a standard price on a low-margin one.

Every match page on this site shows the current price from each tracked bookmaker side by side and highlights the best available number. Start from the fixtures list and open any match.

Reading bookmaker reviews with this in mind Sign-up offers are the loudest thing a bookmaker advertises and among the least important over any meaningful time frame. Pricing quality matters more, every day, forever. Our review methodology explains what we weigh and why, and our bookmaker list records what we have verified.

Understanding margin will not make you profitable. It will stop you paying an unnecessary tax on every opinion you hold. That is a smaller promise than most sites make, and a more honest one.