M Calculator
The M concept was first introduced in Dan Harrington’s book Harrington on Hold’em: Volume 2: The Endgame.
Harrington is a professional poker player and one of the world’s best-known poker tournament players. He has won two WSOP titles, including the 1995 Main Event.
He is also the author of several poker books that we recommend if you want to improve your poker game.
The M concept and Dan Harrington’s zones
The M concept in poker, sometimes also called the zone system, shows your status during certain phases of a poker tournament.
Based on your calculated and effective M, you are in one of the defined zones. Different poker strategies apply to each zone.
In theory, your M shows how many rounds, or orbits, you can still survive. This assumes you add no chips to the pot except blinds and antes.
The poker M calculator below shows your exact tournament status. It does this based on several factors you enter.
After entering all factors and clicking “calculate,” the result shows your effective M. Your zone is also shown in a color.
Dan Harrington’s formula for calculating your M is:
- Your stack / (big blind + small blind + (your ante x players))
There are similar concepts, such as the Q ratio. However, most professional poker players prefer Dan Harrington’s M concept.
[m-calc]Legend
Green zone
M is greater than or equal to 20.
You are in the comfort zone. Keep playing premium starting hands in good position and do not worry too much.
Try to find the right balance between winning pots and minimizing possible losses.
Yellow zone
M is lower than 20 and greater than or equal to 10.
In the yellow zone, returning to the green zone is your main task.
You will need to take more risk by playing more aggressively. Still, do not be reckless. Recognize when you are beaten.
Orange zone
M is lower than 10 and greater than or equal to 6.
This is where the problems begin. Your poker hand selection should become less conservative.
Make a move now and then to pick up the blinds when you are in late position.
You will need to check and call more often instead of betting. With your limited stack, you cannot always force players out of a hand anymore.
Red zone
M is lower than 6 and greater than or equal to 1.
You are pot committed when you call or bet. So, wait for the first decent ace or king to go all in first.
Expect your action to get called. Other players will look for chances to knock you out.
Going all in in the red zone gives you a fair chance to double your stack, or even more. That can bring you back into the orange zone.
Dead zone
M is lower than 1.
Calling is no longer a real option. You simply do not have enough chips.
When nobody has opened the pot yet, going all in is usually best, no matter which cards you hold.
Maybe you get lucky.