M-Ratio Calculator: How Many Orbits Can Your Stack Survive?

M measures survival, and it deliberately assumes the worst case: you fold every hand and let the clock run. A tournament charges you rent - every orbit, the small blind, the big blind, and the antes come out of your stack whether you play or not - and M is simply your stack divided by that rent. If your M is 7, you can pay the rent seven more times before your last chip is gone. That is the honest size of your stack.

Chips lie. A stack that looks healthy at one blind level is gasping at the next, even though not a single chip moved. M cannot lie that way, because it is priced in orbits, and orbits are the only currency the tournament actually charges you in. The question M answers is the one that decides every marginal spot: how much time do I have left to find a better one? A high M means you can wait for good situations and play your full game. A low M means waiting is itself the losing play, because folding has a price and you are running out of the ability to pay it. Your stack is not a pile of chips. It is a number of orbits, and the number only goes down.

Divide your stack by everything one orbit costs: M = stack divided by (small blind + big blind + all antes paid per orbit). Here is the worked example we teach in Part Nine, and the exact arithmetic the calculator above runs.

• Set the table: blinds are 400/800 with a 100 ante, nine players seated.
• Price one orbit: you pay the small blind once (400), the big blind once (800), and an ante every hand - nine antes of 100, which is 900. Total: 400 + 800 + 900 = 2,100.
• Divide: your stack is 14,700, and 14,700 divided by 2,100 gives M = 7.0 - the Orange zone, seven folds from the felt.

Notice the trap. Leave the antes out and you would divide by 1,200 instead of 2,100 and badly overrate the stack - the antes are nearly half the orbit here, which is why the calculator itemizes the breakdown instead of hiding it. One formatting note: with a modern big blind ante, one player posts the whole ante for the table each hand instead of everyone posting a small one. Over a full orbit you post that whole ante exactly once, so it enters the orbit cost just like a round of classic antes does - pick the format your tournament uses and the calculator prices it correctly.

M matters because strategy does not degrade smoothly as your stack shrinks - it changes in steps. The five zones mark those steps, and the calculator above color-codes your result on this exact spectrum:

• Green (M 20 or more): play normally. Your full arsenal is available - raises, calls, traps, speculative hands, every tool in the box.
• Yellow (M 10 to 20): tighten up. Speculative hands - small pairs and suited connectors that need cheap flops and deep stacks to pay off - lose their value, because you no longer have the time or the chips to realize it.
• Orange (M 6 to 10): be the first raiser, and never just call. Your stack is still big enough to make opponents fold, but only if you are the one applying the pressure first; calling spends your clock without buying any fold equity - the chance to win the pot outright by making everyone fold.
• Red (M 1 to 5): push or fold. The middle ground is gone - commit everything or commit nothing.
• Dead (M under 1): shove anything. The blinds already own you; the only mistake left is folding while they collect.

The zone is the point of the whole exercise. You do not compute M to admire the number - you compute it to know which game you are playing this orbit. The same cards, in the same seat, are played three different ways in Green, Orange, and Red. The full zone-by-zone strategy, with hands to drill, is in Part Nine of the lessons.

Because antes are the hidden accelerator on the clock, and counting big blinds hides them completely. Watch what happens to one stack of 30 big blinds.

With no ante, an orbit costs the small blind plus the big blind - 1.5 big blinds - so 30bb is M 20, sitting exactly on the Green line: play normally. Now the next level introduces a big blind ante, adding one big blind per orbit, and the orbit costs 2.5 big blinds. The same 30bb stack is now M 12 - Yellow. You did not lose a pot. You were not dealt a hand. The structure alone moved you a full zone, and a player watching only their big-blind count would never see it happen.

The mechanism is plain once you see it: M is stack divided by rent, and antes raise the rent. This is why a big-blind count that felt comfortable in the early levels becomes an illusion the moment antes kick in - and why the calculator asks for your ante format before it tells you anything. When antes are in play, every orbit charges you more, every stack is shorter than it looks, and every pot is bigger - which is also why fighting for pots gets more rewarding at exactly the moment waiting gets more expensive.

Both - they answer different questions. Big blinds are the currency of a single hand: open sizes, shove sizes, and pot sizes are all quoted in them, which is why our push/fold chart speaks big blinds. M is the clock on your whole event: it prices your stack in orbits of survival, antes included. Use big blinds to size the bet in front of you; use M to know what kind of poker your stack still permits.

The two scales translate cleanly. With a big blind ante running, an orbit costs 2.5 big blinds, and the crosswalk looks like this:

• 40bb = M 16 - Yellow.
• 25bb = M 10 - exactly on the Yellow line.
• 15bb = M 6 - exactly on the Orange line.
• 10bb = M 4 - Red.
• 5bb = M 2 - Red.

Notice where the list lands: the push/fold chart's useful band, roughly 1 to 15 big blinds, is the Red and Orange zones seen in big blinds. The two tools are one system - M tells you when your stack has collapsed into shove-or-fold territory, and the chart tells you which hands to shove once it has. The calculator above shows both numbers side by side, so you never have to convert in your head.

Effective M corrects your M for the size of the table: multiply M by the number of players divided by ten. The reason is the clock again. M counts orbits, but an orbit is only as long as the table is wide - short-handed, your turn to pay the blinds comes around faster, so each orbit of survival buys you less real time. Fewer hands between bites means less waiting your stack can afford.

The correction is not small. An M of 12 - comfortably Yellow - plays like M 7.2 at a six-handed table, which is Orange, and like M 4.8 at a four-handed table, which is Red. Same stack, same blinds - the short table alone moved it two zones. And notice that big-blind counting misses this entirely: 30 big blinds is 30 big blinds at any table size, while the clock underneath runs faster with every seat that empties.

This trap sits exactly where the stakes are highest: final tables, and the short-handed tables just before them as the field breaks. Players see a Yellow-looking stack on the big board and play Yellow poker while their real cushion is Orange or worse. The calculator above computes effective M from the player count you enter and warns you whenever the short table has dropped you into a lower zone than your raw M suggests. When it does, play the lower zone - that is the clock that is actually running.

Q is your stack divided by the tournament's average stack. Where M compares you to the blinds, Q compares you to the field. Enter the average into the calculator above and it reports Q alongside M. From our worked example: a 14,700 stack against a 9,800 tournament average is Q = 1.5 - half again the average.

Read it simply. Q above 1 means leverage: you cover more of the stacks that matter, you can pressure opponents who cannot afford to bust, and the field's clock is running faster than yours. Q below 1 means urgency: the field is outlasting you, and every level that passes without you accumulating makes the climb steeper. The pairing we teach in Part Nine is the sentence worth memorizing: M tells you how to play; Q tells you how urgently. An Orange-zone M dictates first-in raises and no flat calls whatever your Q - but a Q of 1.5 says you can pick your spots, while a Q well below 1 says the spots must come soon.

M is a survival clock, not a hand chart. It tells you what category of poker your stack permits - it does not tell you which hands to play from which seats. For the actual decisions, the zones hand off to the rest of the toolkit: the push/fold chart for Red-zone and Orange-zone shoving ranges, and the full lesson course for everything above them. Three blind spots in particular:

• It ignores who pays next. Two players can share an M of 4, but the one about to post the big blind is in far more trouble than the one who just paid it. M averages the orbit; the orbit does not arrive evenly.
• It ignores position. M sets how wide and how aggressively you can play overall, but seat by seat those answers still swing enormously.
• It ignores ICM - the Independent Chip Model, the math that converts chip stacks into shares of the prize pool. Near a pay jump, chips you might lose are worth more than chips you might win, and a play that is fine by M can be a disaster in money terms. Our ICM calculator prices that pressure, and Part Ten of the lessons teaches when it overrides everything else.

Use M as the first read, not the last word: the clock tells you how much time you have, and the rest of your game decides how to spend it. New to tournaments entirely? Start with what an MTT is, then work through the lessons in order.

M (the M-ratio) is your chip stack divided by the total cost of one orbit: the small blind, plus the big blind, plus all antes paid per round. An orbit is one full trip of the button around the table, in which you pay each of those exactly once. M counts how many orbits you could survive by folding every hand, which makes it a measure of time rather than chips - an M of 7 means seven orbits of pure folding before you are broke.

Add up everything one orbit costs you, then divide your stack by it. At blinds of 400/800 with a 100 ante and nine players, one orbit costs 400 + 800 + nine antes of 100 (900) = 2,100. A stack of 14,700 divided by 2,100 gives M = 7.0. The most common mistake is leaving out the antes, which badly overrates the stack. The calculator at the top of this page shows the full orbit breakdown so nothing gets skipped.

An M of 20 or more is the Green zone, where you can play your normal full game - that is the comfortable place to be. Below 20 the rules change in steps: speculative hands lose value in Yellow (M 10 to 20), first-in raises only in Orange (6 to 10), and pure push or fold in Red (1 to 5). "Good" really means "high enough that the blinds are not yet dictating your decisions."

Five zones: Green (M 20+, play normally with your full arsenal), Yellow (10 to 20, tighten - speculative hands lose value), Orange (6 to 10, be the first raiser and never just call), Red (1 to 5, push or fold), and Dead (under 1, shove anything - the blinds already own you). Each zone is a different strategy, not a gradual adjustment. The calculator above places your stack on this spectrum instantly, and Part Nine of our lessons teaches the play in each zone in depth.

Effective M adjusts your M for table size: multiply M by the number of players divided by ten. Short-handed tables deal orbits faster, so each orbit of survival buys less real time. An M of 12 (Yellow) plays like M 7.2 (Orange) six-handed and like M 4.8 (Red) four-handed - the same stack, moved two zones by the table size alone. It matters most at final tables and as tables break late in a tournament.

Big blinds measure action - raise and shove sizes are quoted in them. M measures time - orbits of survival, with antes included. Antes are the key difference: 30 big blinds is M 20 (Green) with no ante but only M 12 (Yellow) with a big blind ante, and a big-blind count alone would never show that change. Use both: big blinds to size the bet in front of you, M to know what strategy your stack permits. With a big blind ante they translate directly: 40bb = M 16, 25bb = M 10, 15bb = M 6, 10bb = M 4, 5bb = M 2.

Because M is your stack divided by the cost of an orbit, and antes raise that cost. With no ante an orbit costs 1.5 big blinds; a big blind ante makes it 2.5. That single change turns a 30-big-blind stack from M 20 (exactly on the Green line) into M 12 (Yellow) - a full zone drop without a hand being dealt. Any M quoted without the ante format attached is incomplete.

Q is your stack divided by the tournament's average stack. A 14,700 stack against a 9,800 average is Q = 1.5, half again the average. Q above 1 means leverage over the field; Q below 1 means urgency. It pairs with M as taught in our Part Nine lessons: M tells you how to play; Q tells you how urgently.

The concept is named after Paul Magriel, the backgammon and poker theorist - that is what the M stands for. Dan Harrington popularized it in his Harrington on Hold'em books and built the five-zone strategy around the number, which is why it is often called the Harrington M.

The Red zone: M 1 to 5. On the big-blind crosswalk with a big blind ante running, that boundary falls between the 15bb and 10bb marks - 15bb = M 6 is still on the Orange line, while 10bb = M 4 is already Red. Just above it, the Orange zone (M 6 to 10) is not pure push or fold but has its own hard rules: be the first raiser in, and never just call. For the hand-by-hand shoving ranges, use our push/fold chart - its useful band, roughly 1 to 15 big blinds, is exactly these two zones.

No - the formula is the same: stack divided by the total cost of one orbit. The formats only differ in how the ante is collected. With a classic ante, every player posts a small ante each hand; with a big blind ante, one player posts the whole table's ante each hand, so over a full orbit you post it exactly once. Either way, the antes you pay per orbit go into the divisor - the calculator above supports no ante, big blind ante, and classic per-player antes, and builds the orbit cost from whichever you pick.

No. M is a survival clock - it says nothing about prize-pool pressure. Near a pay jump, the Independent Chip Model (ICM) can make a chip-positive play a money-losing one regardless of your M, because the chips you might lose are worth more than the chips you might win. Use our ICM calculator to price that pressure, and see Part Ten of the lessons for when it overrides everything else.