In no-limit or pot-limit poker,

a player's M-ratio (also called "M number", "M factor"[1] or just "M") is a measure 🌞 of

the health of a player's chip stack as a function of the cost to play each round. In

simple 🌞 terms, a player can sit passively in the game, making only compulsory bets, for

M laps of the dealer button 🌞 before running out of chips. A high M means the player can