Statistics · Number Memory
Number Memory statistics
The whole distribution, where the numbers come from, and a calculator that places your own score inside it.
Where your score falls
Type a number to place it in the distribution below.
The percentile bands
| Band | Score | Percentile |
|---|---|---|
| Top 1% | ≥ 16 digits | 99th |
| Top 5% | ≥ 13 digits | 95th |
| Top 15% | ≥ 11 digits | 85th |
| Top 30% | ≥ 10 digits | 70th |
| Median | ≥ 9 digits | 50th |
| Bottom 25% | ≥ 7 digits | 25th |
| Bottom 10% | ≥ 6 digits | 10th |
Bands follow the classic digit-span literature, where the average adult holds around seven digits and 9 to 10 is a strong result.
Digit span in the literature
| Group | Typical span | Notes |
|---|---|---|
| Children 7–12 | 5–6 digits | Span grows through childhood |
| Average adult | 7 ± 2 digits | The classic “magical number seven” finding |
| Strong adult | 9–11 digits | Usually means the digits are being chunked |
| Trained memoriser | 15+ digits | Practised codes for digit pairs, not raw span |
Digit span has been part of intelligence testing since the early 1900s and still appears in the Wechsler scales; the 7 ± 2 figure is Miller (1956).
This format shows the number on screen and lets you read it aloud, which favours chunking and produces higher spans than a clinical auditory digit span.
How we will replace these numbers
The bands above come from other people’s published datasets, named under each table. They are the honest option while this site is new: quoting a percentile from a handful of our own samples would be worse than quoting someone else’s from millions.
Once a test holds more than a thousand clean samples of its own, the percentile switches to our data and starts showing the sample size next to it. Runs that lost focus or looked automated never enter that pool — see how we measure.
Questions
What is the average number memory score?
The median is 9 digits. Half of players score better than that and half score worse.
What is a good number memory score?
Nine digits is around average for adults on this format. Eleven puts you in the top 30%, thirteen in the top 15%, and sixteen or more in the top 5%.
Why are phone numbers seven digits?
Because that is roughly what an average person can hold in short-term memory. Miller’s 1956 paper on the "magical number seven" is the classic reference, and telephone numbering was designed around the same limit.
How do I remember more digits?
Group them. Reading "482917" as "four eighty-two, ninety-one seven" turns six items into three, which fits comfortably inside normal working memory. Competitive memorisers extend the same trick with practised codes for each pair.