How the test works

A number of 3 digits appears for a little under three seconds, 900 ms plus 500 ms per digit, then disappears. Type it back with the keypad or your keyboard. The first wrong digit ends the attempt. Each success adds one digit, up to 20. A mistake costs one of your two lives and gives you a new number of the same length.

Your score is the longest number you typed back correctly.

Your span against the norms

In a computerized lab study of 763 adults, the average forward digit span was 6.52 digits, and 7.41 in a group of 30 young adults with a mean age of 26 (Woods et al., 2011). The digits were heard, not seen, and you repeated them.

Across 24,084 Human Benchmark games, the median is 9 digits (Human Benchmark, 2026). The gap is large because the format is different. Online, you see the whole number at once and have time to group it into chunks, while in the lab the digits arrive one by one, by ear. The players are also volunteers who chose a memory game. Compare yourself with the online norm, and read the lab figure as the classic reference.

Human Benchmark, 24,084 games, score distribution read on 13 October 2026.
Percentile	Score	Reading
P10	7	at least 10% of games end at this score or lower
P25	8	at least 25% of games end at this score or lower
P50	9	at least 50% of games end at this score or lower
P75	10	at least 75% of games end at this score or lower
P90	12	at least 90% of games end at this score or lower
P99	17	at least 99% of games end at this score or lower

The magic number seven, and the first test in 1887

The digit span is one of the oldest measures in psychology. Joseph Jacobs measured how many digits his students could repeat as early as 1887 (Jacobs, 1887). In 1956 George Miller noticed that many tasks seemed to stop around seven items, plus or minus two (Miller, 1956).

The idea of a fixed number has been refined since, because grouping changes everything. Nine digits read as 415 260 873 are three chunks, not nine items.

Forward and backward span

Clinicians also measure a backward span, where you repeat the digits in reverse. It is harder and relies more on manipulating what you hold. This page measures forward span only, the same as the public norm, so the two can be compared.

Questions

What is a normal digit span?

In the lab, about 6.5 digits forward for adults (Woods et al., 2011). On this online format, 9 is the median (Human Benchmark, 2026). Both are normal ranges for their own format.

Can a digit span test detect ADHD?

No. Digit span is part of some clinical batteries, but a single online game cannot support any diagnosis. Talk to a professional if attention is a concern for you.

What this test does not tell you

It measures how many digits you can hold and type back right now, in this format. It does not measure intelligence and it does not diagnose ADHD or any memory problem.

Strategy matters a lot. Grouping digits in threes changes your score more than anything else, so compare yourself with your own games.

Sources

Woods D.L., Kishiyama M.M., Yund E.W. et al. (2011). Improving digit span assessment of short-term verbal memory. Journal of Clinical and Experimental Neuropsychology 33(1), 101 to 111. PMC2978794. doi.org/10.1080/13803395.2010.493149
Human Benchmark, score distributions embedded in humanbenchmark.com, read on 13 October 2026. Reaction time n 70 940, sequence memory n 35 868, chimp test n 27 233, number memory n 24 084. humanbenchmark.com
Jacobs J. (1887). Experiments on prehension. Mind 12(45), 75 to 79. doi.org/10.1093/mind/os-12.45.75
Miller G.A. (1956). The magical number seven, plus or minus two. Psychological Review 63(2), 81 to 97. doi.org/10.1037/h0043158

Written by the Headgame team

Updated 16 October 2026. Scientific reviewer not yet appointed. Every figure links to its source.

Number memory test (digit span)