Bookmaker

Learn to navigate the waters of odds betting and find out what role the bookmaker plays and how it affects your betting and your winnings.

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Kdo je bookmaker?

The work of bookmakers is absolutely essential for betting companies (source: pixabay.com)

It often involves one or more individuals or an entire company that manages betting markets for specific events. They not only oversee compliance with certain rules but also earn a commission (margin) on each game. This can be easily calculated using a formula. With this knowledge, participating in gambling becomes much clearer for players. If you understand how bookmakers operate and how they adjust odds offerings, you’ll have a better chance of success and of finding valuable odds.

Top bookmakers

History of bookmakers

The main task of bookmakers is simply to manage the odds in bookmakers. The first bookmaker in 1795 offered bets on horse races in Newmarket. Over time, their focus expanded to other professional sports such as football, cricket, or boxing. Nowadays, bookmakers offer much broader options and accept bets on various events such as political election results, award ceremonies like the Oscars, global developments, or the gender of a celebrity couple’s baby.

What does a bookmaker do?

The main responsibility of bookmakers is setting betting odds for different events. These odds represent the probability of a certain outcome, adjusted with a margin to ensure profit regardless of whether the player wins or loses. This margin creates a difference between the offered and the “fair” odds. To create odds, they also need excellent analytical skills. To create or adjust betting odds, they must be deeply and thoroughly informed about the given event. In sports, this means understanding the players’ and coaches’ characteristics and form, and factoring injuries or other developments into their analysis. Similarly, those setting odds on political events need to be well-informed about politicians’ behavior and public opinion.

Fair betting

Players rarely come across so-called “fair bets”. The odds are always carefully set by bookmakers, whose reward is the placed bets. Fair betting usually occurs only in amateur circles where the role of the bookmaker is replaced by a banker who doesn’t take a commission. For example, in a coin toss, the probability of each outcome is 50%, so the fair odds would be 2.00. However, because the bookmaker needs to profit, they offer slightly worse odds, typically between 1.85 and 1.99.

How to beat the bookmaker?

Experienced bookmakers can create odds and conditions that maximize their profit from any outcome. Even when many players win and the profit is smaller, they remain profitable in the long run. Their reward is offset by more lucrative opportunities. Players who want to beat the bookmaker must consistently bet on value odds and carefully choose their bets.

How to calculate the margin?

It’s up to the bookmaker to decide how high a margin to apply to a specific event. It usually ranges between 2–10% (in rare cases even higher). Knowing how to calculate this can help players find the bookmaker offering the best possible return. A simple formula (see below) allows easy calculation. “m” in the formula stands for the bookmaker’s margin, and “k1” and “k2” are the odds.

  • m = 1 – (k1 x k2) / (k1 + k2)

When you insert the actual values for “k” and subtract the result of the fraction from 1, you get a decimal number. By multiplying it by 100, you get the percentage that represents the bookmaker’s commission (margin) for that event.

How does the margin affect player winnings?

If players can calculate the bookmaker’s margin, they can choose where betting is most advantageous. The lower the bookmaker’s margin, the better the odds for the player. However, they should still be cautious and prefer to place bets with verified operators rather than questionable ones offering suspiciously good odds.

Ideal bookmaker

To reduce the risk of losing money with unverified operators while still having a good chance to win, players should choose their bookmaker based on certain criteria. Most importantly, the bookmaker’s credibility and legality, which is easy to verify online. They should also consider the customer support and overall experience of using the website, mobile app, or physical branch. Last but not least, the level of the bookmaker’s margin plays an important role.

Risks of betting without a bookmaker

Many players may think betting would be more profitable without a bookmaker. However, someone must hold the staked money until the outcome is known. Relying on unverified bookmakers or trusting a fellow player acting as a banker can easily lead to misappropriation of funds.

Advantages of betting with a bookmaker

Betting with a verified bookmaker gives players a sense of trust and safety for themselves and their funds. They also have the opportunity to claim bonuses offered by bookmakers. This allows them to place any bet with reduced risk of losing their money. Loyal players who stick to their favorite bookmaker and bet consistently benefit the most.

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Frequently asked questions

Who is a bookmaker?
It is a person, group of people, or a company that creates and adjusts betting odds for various events—most often for sports matches, political events, and more.
What is a bookmaker's margin?
A bookmaker’s margin represents the commission they earn from placed bets. The odds are adjusted based on this margin to ensure they are more favorable for the operator than the player.
How to determine the bookmaker's margin?
Players can easily calculate the bookmaker’s commission using a simple formula (see above). They only need to know the odds for the event. The lower the margin, the better the value for the player.
5/5 - (1 vote)

Michael Cermak

Michael Cermak

Article author – expert on bookmakers
Follow me: LinkedIn | Facebook
E-mail: michael@slothbet.com

I started gaining experience in sports betting through my work in the customer support of a foreign bookmaker. It didn't take long before I started betting actively myself. This has continued to this day. Besides thematic articles, I look for interesting bonus offers and valuable odds for you. You can find all articles here.
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