How to calculate a stack in big blinds

Practice with exercises

Content by Tools of Poker Methodology and calculation assumptions

SB, BB and stack: the three quantities

SB is the small blind and BB is the big blind: the compulsory bets used to set the stakes. A stack is the chips a player has. Hero identifies the player whose stack you must convert. With blinds of 100 / 200, SB is 100 chips and BB is 200 chips.

BB is a unit of measurement, just as a dozen groups twelve objects. Expressing stacks in BB lets you compare stack depth across different blind levels. The same chip count can represent a deep or a short stack when BB changes.

Divide chips by the big blind

Read Hero’s chip count first. Then find the amount explicitly labelled BB below the answers. Divide the chip count by that amount. The chip units cancel, leaving a number of big blinds.

Stack in BB = Hero’s chips / chips per BB

Use exactly the number displayed in Hero’s box. This exercise presents a static stack with no bets to reconcile. Do not deduct a blind, add the two blinds together or compare the opponent’s stack.

Examples with whole numbers and decimals

Hero has 4,800 chips and the blinds are SB 100 / BB 200. Each BB contains 200 chips, so 4,800 / 200 = 24 BB. Check by multiplying: 24 × 200 = 4,800 chips.

With 12,800 chips and SB 100 / BB 200, the stack is 64 BB. Hundreds describe the step between possible chip counts, not a limit of three digits.

Hero has 4,950 chips and SB 100 / BB 200. The division is 4,950 / 200 = 24.75 BB. Keep that decimal part: choosing 24 or 25 would change the stack being measured.

If the blinds rise to SB 200 / BB 400 while Hero still has 4,800 chips, the stack becomes 12 BB. The chip count is unchanged, but each BB now costs twice as many chips.

One rounding rule for every answer

Answers show at most two decimal places; trailing zeros are omitted. Divide without rounding the inputs, then round the final BB amount once. Look at the third decimal: 0–4 leaves the second decimal unchanged; 5–9 increases it by one.

For 4,810 chips and BB 300, 4,810 / 300 = 16.0333… BB, displayed as 16.03 BB. For 4,805 chips and BB 200, the exact answer is 24.025 BB, displayed as 24.03 BB. An exact halfway value rounds upward, never to the nearest even digit.

The options, answer correction and result explanation use this same rounding rule. The result uses ≈ when rounding is needed and = when the displayed BB amount is exact. Number separators follow the selected language.

Common conversion mistakes

  • Dividing by SB: 4,800 / 100 gives 48 small blinds, not 48 BB. The BB answer is 24.
  • Dividing by SB + BB: 4,800 / 300 gives 16, but the two blinds together are not one BB.
  • Subtracting a blind first: the displayed Hero stack is already the exact input. Use 4,800, not 4,600.
  • Dropping decimals or rounding early: keep the original chip count and BB value until the final division.

How the five difficulties work

Every difficulty asks one question with one correct answer. Beginner and easy show three choices and always give a whole number of BB, using multiples of 100 chips and 50 or 40 seconds respectively. Intermediate and difficult show four choices, using multiples of 10 chips and 25 or 15 seconds. Nightmare shows five choices, uses whole chips and allows 10 seconds.

Intermediate and difficult include stacks that are not multiples of 100. Nightmare includes stacks that are not multiples of 10. The timer follows the usual exercise start. After an answer or timeout, the same table stays visible and the result shows the actual conversion. Play again keeps your difficulty; the other button returns to the exercise directory.

Frequently Asked Questions

SB means small blind and BB means big blind. They are compulsory bets that define the stakes of a hand. In this exercise BB is twice SB; use the amount labelled BB as the divisor.

A stack is the chips a player has. Hero is your player. Here, convert exactly the chip count inside Hero’s box; no blind, ante or bet needs to be added or subtracted.

One BB is worth the current big blind in chips. Dividing the stack by that unit tells you how many big blinds fit into it. SB and SB + BB measure different amounts and give the wrong conversion.

Yes. A stack need not be an exact multiple of BB. Keep full precision during division and round only the final answer to at most two decimals. If the third decimal is 5 or more, increase the second decimal by one.

No. Only Hero’s own chips are converted. The effective stack also depends on an opponent’s stack and is studied in a separate exercise.

Convert exactly the chip count in Hero’s box. SB and BB are shown separately below the answers; use BB as the divisor. No other player, position or card is needed.