Betting maths and calculators
What is the best way to visualise a bookmaker's overround?
Direct answer
Show each outcome's implied probability in a bar chart and shade the total probability above 100% as the margin.
How to use this answer
The principle is supported by the referenced rules, but a different operator or market can apply a different settlement condition. Treat the named provider as a specific example, not as a universal betting rule.
Use the precise stake, decimal odds, market terms and outcome probabilities when calculating the result. Expected value measures an average over hypothetical repetitions, not a guaranteed profit.