Does anyone have a specific method for determining their bankroll (i.e. maximum amount they are comfortable losing) for a trip? I use a calculation of roughly 5% of liquid net assets (cash and investments less debt). Cash and investments excludes all retirement savings. Debt includes mortgages and auto loans. I don't go out to Vegas expecting to lose all of my bankroll, but it gives me my loss limit. How do you determine your bankroll for a trip?