ICM in Poker: What It Is and How It Changes Your Decisions

ICM stands for Independent Chip Model. It is a method that converts your tournament chips into the share of the prize pool they are worth. The main idea is simple and surprising: in a tournament with prizes, chips are not worth their face value in money. Doubling your stack does not double your prize equity, and losing your stack costs you more than winning the same number of chips would give you.

The short version

• In a cash game 1 chip = 1 unit of money. In a tournament, chips turn into prizes through the payout ladder.
• The chips you win are worth less than the chips you lose. This is why most players should avoid close, risky calls when many players are about to be paid.
• ICM matters most near the bubble, at the final table, in satellites and in short-handed sit-and-gos.
• It matters little in the early stages of a deep-stacked tournament and not at all in cash games.

Why chips are not money

Imagine a tournament with three players left and a $100 prize pool paying $50 to first, $30 to second and $20 to third. The stacks are:

• Player A: 5,000 chips (50%)
• Player B: 3,000 chips (30%)
• Player C: 2,000 chips (20%)

If chips were worth money, A would have $50, B $30 and C $20. ICM gives a different answer.

How ICM calculates the value of a stack

ICM assumes the chance of finishing first equals your share of all chips. To find the chance of finishing second, it removes the winner and repeats the calculation with the remaining chips:

• Chance of finishing 1st: your chips ÷ all chips.
• Chance of finishing 2nd: for each possible winner, the chance they win times your chips ÷ (all chips minus the winner's chips).
• 3rd place and below follow the same way. Then multiply each chance by the matching prize and add them up.

For the example above, ICM gives:

• Player A (50% of chips): about $38.4, which is 38.4% of the pool.
• Player B (30% of chips): about $32.8, which is 32.8% of the pool.
• Player C (20% of chips): about $28.9, which is 28.9% of the pool.

The big stack holds half of the chips but gets only 38% of the prize pool. The short stack holds a fifth of the chips and is worth 29%. Chips have diminishing value: each additional chip adds less equity than the one before.

What this means for your decisions

In a cash game, an all-in call is correct if you win more than the price demands (see pot odds). In a tournament the price is higher, because losing the all-in can cost you your whole prize chance, while winning does not double it.

Suppose you would call an all-in with 50% equity in a cash game, which has zero expected value. Under ICM you often need noticeably more, sometimes 55–65% near the bubble, because your risk (a lost stack) is larger than your reward (a gained stack in equity terms). This extra requirement is sometimes described as the bubble factor.

When ICM matters most

• The bubble: the last place before the money. Players fold hands they would shove at any other time to avoid elimination.
• Pay jumps: when the next place pays much more than the current one, surviving is worth a lot.
• Final tables: the prizes are large and steeply graded.
• Satellites: in a satellite that awards a fixed number of seats, all winners get the same prize, so once you are safely in, extra chips are worth nothing. ICM is at its most extreme here.
• Short-handed sit-and-gos and Spin & Go: every elimination changes the prize equity right away. See the Spin & Go guide.

When ICM barely matters

• Early levels of a deep-stacked tournament: you have a long way to the money and chips keep roughly their value.
• Cash games: chips are money, so chip value and money value are equal.
• Winner-take-all formats: one prize means equity is proportional to chips, so there is no ICM pressure (apart from the usual chip EV).

Practical rules for players

• Big stack: you have the most pressure power. Raise often against medium stacks that cannot afford to risk elimination. Avoid coin flips against short stacks if a simple raise is enough.
• Medium stack: the most ICM-sensitive position. You have a lot to lose, and the big stack can attack you. Pick spots carefully and avoid marginal calls against big stacks.
• Short stack: you have little to lose, so shoving with a wide range is often right, especially when the big stacks are fighting each other.
• Look at who is behind you: shoving into two short stacks is safer than shoving into a big stack.
• Know the payouts: a flat payout structure increases ICM pressure; a top-heavy one reduces it.

ICM and bounty tournaments

In knockout and progressive bounty tournaments part of the prize is paid for each elimination, so chips and bounties both matter. Calling ranges often become wider than pure ICM would suggest. See the PKO guide.

Tools for studying ICM

Dedicated ICM calculators, such as HoldemResources Calculator or ICMIZER, let you enter stacks and payouts and show the ICM value of each decision. Use them away from the table: after a session, look at the hands where you folded or called in key tournament spots, and see what the model recommends.

Try the calculator

Enter the stacks and payouts in the ICM calculator to see each player's prize equity and the bubble factor of an all-in, with the equity you need to call.

What to read next

• MTT strategy basics: stages of a tournament.
• PKO and bounty tournaments: how bounties change ICM.
• Cash games vs tournaments: how the formats differ.
• Pot odds: the maths of calling without ICM.