Originally Posted by loopmeister
M-ratio (from Wikipedia):
In no-limit or pot limit games the ratio of stack to the blinds and/or antes. For example 8-way in a no limit game hold'em game with blinds of $50/$100 and an ante of $10 a stack of $23,000 has an M-ratio of 100. To further clarify, M = $23,000 / [$100 + $50 + ($10 * 8)] = 100. The term was coined by poker author Paul Magriel.
It's an indication of how many orbits you can still last in the game without winning anything, if you were to fold every hand.
Yep. The only thing to keep in mind is that M is based on a point in time, not over time. What I mean is that knowing you can make 100 orbits is usually good enough at the time it is used but in the long run is mis-leading because you won't be playing 100 orbits at the current blind level. So M will need to be watched over time. Don't get me wrong, I'm not knocking M at all for its purpose.
Just what I thought was interesting is that I once saw a formula published somewhere that incorporated time levels and tournament speed into the calculation. So if you were the world's tightest rock (e.g. would only call with suited AA ), if you never played another hand in the tourney, how long would you last before being blinded/anted out. If I ever find it, I will post it for feedback.