Gambling Math Examples
Simple worked examples for house edge, expected cost, sportsbook margin and bonus wagering requirements.
These examples show what common gambling calculations mean in dollars and percentages—and what they cannot predict about one session.
Expected cost example
$1,000 of total action on a 2.7027% house-edge configuration has a long-run expected cost of about $27.03. It does not mean you will lose exactly $27.03 in a $1,000 session.
Sportsbook example
Odds of 1.91 and 1.91 imply a displayed two-way market overround of about 4.712%. That is a price-structure measure, not a guaranteed realized sportsbook margin.
Bonus example
$2,000 of credited wagering at 25% game contribution requires about $8,000 of actual qualifying action. This is why contribution rules matter more than the headline multiplier alone.