Memory test
A digit span test: watch a run of digits, then type them back. Adults in a 763-person study averaged 6.35 digits forward and 4.61 backward. Find your span in about three minutes.
Two tries at each length, starting at 3 digits. One right answer moves you up a digit; two misses end the test. Your span is the longest run you got right.
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What your digit span means
Digit span is one of the oldest memory measures in psychology. In 1956 George Miller wrote that people can recall about seven decimal digits, and that grouping items into larger chunks raises how much the span can hold. A large modern sample puts the adult mean a little lower: 6.35 digits forward and 4.61 backward across 763 people aged 18 to 65, with a test close to this one.
Forward and backward
Forward span is mostly holding and repeating. Backward span makes you reorder what you hold, so it leans on working memory, the system that keeps information ready while you think. That is why almost everyone scores one or two digits lower backward. Our piece on cognitive load shows what happens when a task asks more of working memory than it can give.
Why the number is not fixed
Nelson Cowan's review puts the core limit at 3 to 5 chunks; the higher digit span comes from silent rehearsal and grouping. So strategy, sleep and attention move your score, and one run is a snapshot, not a trait. In hiring, memory span alone predicts little; the cognitive ability test post covers what broader reasoning tests can and cannot tell an employer.
Questions
What is a good digit span
In a study of 763 community adults aged 18 to 65, Woods and colleagues (2011) found a mean forward span of 6.35 digits and a mean backward span of 4.61. George Miller's 1956 paper put the span of immediate memory at about seven items. A forward span of 6 to 8 is in the usual adult range; one result on one day is not a diagnosis.
What does the digit span test measure
Forward span measures how many digits you can hold and repeat in order, a measure of short-term verbal memory. Backward span asks you to repeat them in reverse, so you also have to work on what you hold, which is why it is used as a measure of working memory and why scores are lower.
Why can I remember more than four digits if working memory holds four chunks
Nelson Cowan's review puts the core limit at 3 to 5 meaningful chunks in young adults. Digit span runs higher because people rehearse the digits silently and group them into chunks such as 47 or 1984. When rehearsal and grouping are blocked, recall falls to about three or four units.
Is this a test for dementia or memory loss
No. It is a practice task for curiosity and self-tracking, not a clinical test. Tiredness, distraction and the screen all change the score. If you are worried about your memory or someone else's, talk to a doctor, who can use validated tests with norms for age and education.
Sources
- Miller, G. A. (1956). The Magical Number Seven, Plus or Minus Two: Some Limits on Our Capacity for Processing Information. Psychological Review, 63, 81-97 (Classics in the History of Psychology, York University)
- Woods, D. L. et al. (2011). Improving digit span assessment of short-term verbal memory. Journal of Clinical and Experimental Neuropsychology, 33(1), 101-111 (PMC)
- Cowan, N. (2010). The Magical Mystery Four: How is Working Memory Capacity Limited, and Why? Current Directions in Psychological Science, 19(1), 51-57 (PMC)