Three things a bettor has to work out before placing anything: what the bet returns, what the odds mean in the format they are used to, and how much of the price the bookmaker keeps. Each formula is written out under its tool, so the number can be checked by hand.

Nothing here is sent anywhere: the arithmetic happens in the browser, and no figure is stored or transmitted.

What Comes Back

Combined odds
2.10
Returns
21.00
Of that, profit
11.00

Return = stake × the odds multiplied together. Profit = return − stake: the stake itself comes back with the win and is not profit.

The Same Odds in Every Format

Probability = 1 ÷ decimal odds. Fractional odds are the clear win against the stake, which is the decimal minus one. American odds of +100 and above show the win on a hundred staked; below −100 they show what you must stake to win a hundred.

Bookmaker Margin

Margin
4.23%
Return to player
95.94%
Odds with the margin removed
2.50 · 3.44 · 3.23

Add up 1 ÷ odds across every outcome in the market. On a fair market the total is one; everything above it is the bookmaker's margin. Removing it means dividing each probability by that total.

We take this same figure match by match and publish it on the bookmaker cards — work it out from the line yourself and check ours.