Hold Calculator

Work out a bookmaker's hold - the share of total turnover it expects to keep on a balanced market.

A hold calculator reveals what share of the total money staked on a market a bookmaker expects to retain, a figure that is crucial for understanding book profitability but often confused with the margin.

What Is Hold?

Hold is the percentage of all money staked on a market that a bookmaker expects to keep once the book is perfectly balanced. It is closely related to the margin — the mark-up above 100% — but it is not the same number. The margin tells you how far above a fair market the prices sit. The hold tells you what fraction of turnover the bookmaker pockets from a balanced book. Hold is always the slightly smaller figure, and it is the one bookmakers quote when describing their edge. This distinction matters: it changes how you assess value when shopping across bookmakers. Understanding the difference is essential for serious bettors measuring value consistently.

Hold is a theoretical concept. It assumes equal money on both sides, which rarely happens. Over long periods, hold describes the expectation, the long-run average. For bettors comparing bookmakers, hold is the consistent metric.

The bookmaker’s hold comes out of every stake placed and is present in every odd quoted. Recognising the hold in the prices — and what it means for your long-term returns — is the difference between casual betting and disciplined wagering. Hold sets your long-run break-even point. If the hold is 5%, your selections must win more often than the odds suggest to overcome it. Understanding hold transforms how you evaluate value. Your job as a bettor is to identify selections where your edge exceeds the hold.

How Hold Is Calculated

Hold requires three steps. First, convert each decimal odd into an implied probability. For a price of 1.90, the implied probability is 52.63% — take one divided by 1.90. On both sides: 52.63% + 52.63% = 105.26%. This total exceeds 100% — the difference is the overround, where the bookmaker’s profit comes from.

The second step converts the overround to margin: 105.26% − 100% = 5.26%. The third step is different: hold = (1 − 100 ÷ 105.26) × 100 = 5.00%. The hold is slightly lower than the margin because it measures profit as a share of total turnover, not as a mark-up. On this market, the bookmaker is marked up by 5.26% but keeps 5.00% of money staked.

Why does the hold come out lower than the margin? Because hold expresses profit as a share of total money taken, while margin expresses it as a mark-up. With 105.26% odds, the bookmaker keeps 5.00% of turnover to achieve their 5.26% mark-up. Same profit, two expressions. The margin answers “how much above 100%?” while the hold answers “what fraction of my stake do I never see back?” If you stake €100 at 1.90 on both sides, the expected hold is €5.00, not €5.26.

When evaluating two bookmakers on the same market, hold tells you which charges less in the long run. A 5.00% hold means €5 from every €100 wagered. A 7.50% hold means €7.50. That 2.50% difference compounds over time. The difference between a 2.50% hold and a 5.00% hold becomes real money over a career. A bookmaker offering 1.95 / 1.95 (2.50% hold) is cheaper than one offering 1.90 / 1.90 (5.00% hold).

What the Calculator Shows You

The calculator takes two inputs — the decimal odds on each side of the market — and returns several figures. Total implied percentage is the sum of the implied probabilities, always above 100%. Margin is the total implied percentage minus 100, the simple mark-up. Hold is what the bookmaker expects to keep on a balanced book, always slightly lower than the margin. These three figures tell you everything about the bookmaker’s edge on this particular market.

The calculator also breaks down the implied probability for each side. A 1.90 / 1.90 market implies 52.63% for each. Compare against your own view: if you think an outcome is more likely, you have found value.

The hold is the metric that matters most when choosing bookmakers. By showing hold explicitly, the calculator lets you compare two bookmakers on the same market: the lower hold offers better odds. If one quotes 1.95 / 1.95 (2.50% hold) and another quotes 1.90 / 1.90 (5.00% hold), the first is objectively cheaper over hundreds of bets.

Worked Example

Take a two-way Over/Under market at 1.90 on each side — the classic balanced book. Over 2.5 goals is 1.90, and Under 2.5 goals is also 1.90. The implied probability of each outcome is 52.63%. Adding them together: 52.63% + 52.63% = 105.26%. The margin is 105.26% − 100% = 5.26%. But the hold is (1 − 100 ÷ 105.26) × 100 = 5.00%.

On a perfectly balanced book the bookmaker keeps 5.00% of everything staked, even though the market is marked up by 5.26%. This is the key distinction between margin and hold. The margin of 5.26% is how far above a fair market these prices sit. The hold of 5.00% is what the bookmaker actually expects to keep from total turnover if the book balances evenly between both sides.

Two-Way Market: How the Price on Each Side Sets the Hold

When both sides of a market are priced identically, the hold is determined entirely by that price. The shorter the price, the higher the hold. Below is how different prices on a two-way market combine into hold percentages. Notice that at 2.00 the hold is 0.00% — fair odds have no bookmaker edge. Each step shorter increases the hold systematically.

Margin and Hold Are Not the Same Number

Hold and margin describe the same underlying edge but in different ways, which is why mixing them up is a common error. Both come from the same overround, but they answer different questions.

The confusion arises because they are close. On the 1.90 market in the example, 5.26% and 5.00% sound interchangeable. They are not. The margin of 5.26% describes the overround as a percentage of a fair market. The hold of 5.00% describes the bookmaker’s expected profit as a proportion of total turnover. For serious bettors tracking edge across multiple bookmakers, the hold is the consistent metric because it measures what actually gets kept as a share of money wagered.

Hold as a Theoretical Figure

Hold is a theoretical expectation, not a guarantee. It assumes the bookmaker balances the book perfectly, taking exactly equal liability on both sides. In reality money rarely arrives evenly. Some outcomes attract more backing than others — a popular team, a public favourite, a crowd-pleasing result. When a bookmaker has taken unequal money on both sides, the actual amount retained is higher or lower than the hold.

On a single market the bookmaker can lose outright. Over a tournament, a season, or a year, the hold describes the long-run expectation across all the balanced books. This is why hold is a metric for understanding bookmaker profitability in aggregate, not for predicting what happens to any one market. It is also why the bookmaker’s business model depends on balance — they want roughly equal money on both sides so that the hold emerges reliably and the business compounds on volume.

This is crucial: the bookmaker does not need to predict outcomes accurately to profit. They make their money from the hold and volume. A bookmaker running a 5.00% hold on balanced books knows their profit expectation in advance. The bettor must predict accurately enough to overcome that hold.

For bettors, hold sets your long-term expectation. If you consistently bet against a 5.00% hold, you need to win 5.00% more often than odds suggest to break even. Professional bettors who find edges larger than the hold will profit. The hold is simply the cost of doing business. The question is whether your accuracy can overcome it.

When Understanding Hold Makes Sense

Hold matters when comparing value across bookmakers on the same market. The lower the hold, the better the prices for you. A bookmaker offering 1.95 / 1.95 has a hold of 2.50%, while one offering 1.90 / 1.90 has a hold of 5.00%. That 2.50% difference compounds over a career. Understanding hold shifts your mindset away from isolated bets. A single bet won or lost says nothing about beating the hold. Over many bets, the hold is the hurdle you clear when profitable.

Most bettors track whether they win or lose on individual bets. Professionals track whether they beat the hold. If you consistently identify bets where your expectation exceeds the implied probability by more than the hold, you win over time. If you cannot, the hold drains your bankroll gradually. This distinction separates profitable bettors from those who leak money slowly.

The hold is not a complaint against bookmakers; it is simply a cost of using their service. Use this calculator to measure what that costs on each market you consider. When choosing between two bookmakers on the same selection, calculate both holds and choose the lower one. A 2.50% hold is dramatically better than a 5.00% hold; the difference is real money over time. Strategic bookmaker selection based on hold is one of the few levers casual bettors can pull to improve long-run outcomes without improving prediction accuracy.

Common Mistakes

The most common error is using the margin figure and calling it the hold. They sound identical but measure different things: margin is the mark-up above fair value, hold is profit as a share of turnover. Mixing them up leads to wrong conclusions about bookmaker costs.

Applying hold to a single market rather than long-run turnover is another mistake. Hold is theoretical and long-run, not a prediction of tonight’s result. A bookmaker can lose outright on any one market.

Comparing a two-way hold with a three-way hold without adjusting for structure is misleading. The structure changes the calculation.

Finally, assuming the bookmaker always balances perfectly is unrealistic. Real money varies. Use hold as a long-run benchmark.

Hold Against the Other Tools in This Family

Hold, margin, and no-vig are related but distinct tools that measure different aspects of the same market. Each answers a different question: margin measures the overround as a percentage above fair value, hold measures the profit the bookmaker expects to keep from turnover, and no-vig removes the margin entirely to reveal the fair odds underneath.