Chunking: the simple trick behind great memories
Your short-term memory can only hold a few things. Chunking makes each “thing” bigger. It’s the single most useful memory trick there is.
Read this once, then look away and repeat it: F B I C I A U S A. Nine letters is a lot. Now read it as FBI, CIA, USA. Suddenly it’s easy. You didn’t get a better memory in the last five seconds. You chunked.
What chunking is
Chunking means grouping small pieces of information into larger, meaningful units. Your short-term memory can only hold a handful of things at once. George Miller’s famous 1956 paper put the number at “seven, plus or minus two”, and later research suggests closer to four chunks. The key word is chunks: the limit is on the number of units, not on how much information each unit contains.
Chunking in everyday life
- Phone numbers: 4165550182 becomes 416-555-0182.
- Card numbers and codes are printed in groups of four for the same reason.
- Reading: you read whole words, not letters, and often whole phrases.
- Shopping lists: “dinner stuff, breakfast stuff, cleaning stuff” instead of twelve items.
Why experts seem to have huge memories
A classic line of chess research found that masters could glance at a real game position and reconstruct it far better than beginners. But when the pieces were placed randomly, the masters’ advantage mostly vanished. They weren’t storing 25 pieces; they were storing a handful of familiar patterns. Expertise, in large part, is having a big library of chunks.
How to chunk better
Group in threes. For numbers, groups of three are easy to say and hold: 482 917 305.
Find meaning. 1984 is a year. 747 is a plane. 365 is a year of days. Meaningful chunks are the strongest.
Use rhythm. Say the chunks with a beat between them, like reading out a phone number.
Look for shapes. For visual information, like the tiles in Recall, see an L-shape or a diagonal instead of separate squares.
Categorize lists. Group items by category, place or first letter.
Try it now
Take this quick number memory test twice: once remembering each digit separately, and once grouping them in threes as they appear. Most people gain a digit or two just from chunking.
Going further
Chunking is the foundation of almost every memory technique. For the next step, combine it with images using the memory palace, or see how it fits into working memory as a whole.
Frequently asked questions
What is chunking in psychology?
Chunking is grouping individual pieces of information into larger, meaningful units, like remembering a phone number as three groups of digits instead of ten separate ones.
Why does chunking help memory?
Short-term memory holds a limited number of chunks, not items. Making each chunk bigger lets you hold more information in the same space.
What is an example of chunking?
The letters F B I C I A U S A are hard to hold as nine letters, but easy as three chunks: FBI, CIA, USA.