Using our margin calculator, any bettor will be able to determine which bookmaker will have the lowest margin and bet on better terms. The tool allows you to calculate this value for bets with two or three outcomes. All you have to do is enter the odds offered by the bookmaker.

# Bookmaker's margin calculator for betting

## What is the bookmaker's margin calculator for?

Bookmakers make money on sporting events, regardless of their outcome. Having bet on any outcome of any match, the player has already paid the bookmaker the commission. How is it possible?

Well known that the coefficient - this is the reverse value of the probability of the outcome. For example, for an outcome with a probability of 50%, the coefficient will be equal to 2. However, when we are dealing with bookmakers, mathematics is powerless. The fact is that bookmaker overestimates probabilities of outcomes, thereby reducing the coefficient. Thus, when you bet on the outcome with a real probability of 50%, you will get reduced odds corresponding to a probability of 55%. These 5% are the bookmaker's margin. Another indication of margin presence is the fact that by summing up probabilities of opposite outcomes (for example, TO 2.5 and TU 2.5), you'll always get a number greater than 100%.

All **xGscore** algorithms for predictions, operate only with pure odds and don't take into account the margin of bookmakers, since this value is not constant and may vary depending on the bookmaker and the event.

**Poisson calculator**

Calculate probabilities of outcomes based on pre-match expected score.

**Margin calculator**

Reveal real bookmaker's probabilities and fair coefficients.

**Surebet calculator**

Check if there is arbitrage opportunity to guarantee your profit.