How many digits can the average person remember?
The average adult can hold 7 digits (± 2) in working memory — meaning most people score between 5 and 9 on a standard digit span test. This limit was documented by Harvard psychologist George Miller in his landmark 1956 paper "The Magical Number Seven, Plus or Minus Two."
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| Score | Percentile | Notes |
|---|---|---|
| 4 | Bottom 5% | May indicate working memory deficit |
| 5–6 | 5th–20th | Below average; low end of Miller range |
| 7 | 45th–65th | Average; Miller's modal value |
| 8–9 | 65th–93rd | Above average to excellent |
| 10+ | Top 7% | Likely using chunking strategies |
| 16+ | Site record | Verified world-class mnemonic technique |
The limit arises from the phonological loop — a temporary verbal scratchpad that holds sound-based information through subvocal rehearsal. Modern research (Cowan, 2001) suggests the true capacity limit may be closer to 4 chunks, with the apparent 7-item limit arising from automatic grouping. Read more on the Number Memory test page.
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Quick Answer
The average adult can hold 7 digits (±2) in working memory — George Miller's famous "Magic Number 7" from 1956. Most people score between 5 and 9.
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