How many digits can you hold?
The real digit span task from cognitive testing. Digits appear one at a time; type them back in order. Every success adds one more.
Digits appear one at a time. Type them back.
Starts at 4. Every success adds one more.
Where 5 to 9 comes from
The famous seven. The range everybody quotes traces to one 1956 paper that found people could hold about seven items, plus or minus two, before the list started falling apart. Digit span became the standard way of testing it, and it still sits in the cognitive exams a neurologist uses. Miller, Psychological Review, 1956.
The half nobody quotes: seven was never the real limit. Miller was writing about chunks, not digits, and half-joking about being pursued by an integer. A later review of the evidence put raw capacity nearer four. Digit span comes out higher because people group numbers without noticing, the way a phone number turns into three pieces instead of ten. Holding seven is partly memory and partly a trick you already use. Cowan, Behavioral and Brain Sciences, 2001.
Which means one run of this is not a diagnosis of anything. Noise, tiredness and a small screen all cost a digit. Your own best across weeks is the only comparison with any signal in it, and a real memory worry belongs with a doctor rather than a web test.
Every figure on this site names where it came from. How we check.
Common questions
What is a normal memory span?
Most adults can hold 5 to 9 digits in order, and 7 is the classic average, which is one reason phone numbers were designed at that length. Reaching 6 or 7 here is entirely normal. Span drifts down slightly with age, and that alone is not a warning sign.
Is this the test doctors use?
Digit span is a real component of standard cognitive batteries like the WAIS, where a clinician reads digits aloud and also asks for them backward. This version is self-run on a screen, so treat it as an honest practice version: good for watching your own trend, not a diagnosis of anything.
Why is my score worse some days?
Working memory is the most weather-dependent part of thinking. Short sleep, stress, pain, background noise and trying to do two things at once all shave digits off. A single low score means very little; your typical score across quiet attempts is the number that matters.
When is memory worth seeing a doctor about?
When the change is persistent and noticed by other people too: repeating questions in the same conversation, getting lost on familiar routes, or trouble managing money or medicines that used to be easy. One forgotten name or a bad test day is not that. A doctor can check hearing, thyroid, B12, mood and medicines, which explain a surprising share of memory complaints.
How many digits can the average person remember?
About seven, plus or minus two, which is why phone numbers were designed the length they are. Scores of five to nine forward digits are all normal territory, and a bad night of sleep can cost a digit or two. A gradual lifelong pattern matters; one off day does not.