The average number memory score is 9 on Human Benchmark, or 8 digits remembered. See your percentile, why the magic number 7 is off, and how to beat it.
Published October 19, 2026
The average number memory score is 9 on Human Benchmark, the site that made the test popular: the median of its 24,084 graded results is 9, and the mean is 9.3. Human Benchmark scores the level you fail, so a typical player remembers 8 digits and misses the ninth. On the HumanRank number memory test, which scores the longest number you get right, that same run is an 8.
That is one digit more than the most famous number in psychology. In 1956, George Miller called it the magical number seven, and Human Benchmark still tells its players that the average person can remember 7 numbers at once. Yet nearly two in three of them remember 8 digits or more. Here is why, where your own score ranks, and how one student trained his way to 79 digits.
Remember 9 digits and you beat more than half of all players.
Take the number memory test
Here is where each result lands on the score distribution Human Benchmark uses for its percentiles. The first column is the longest number you recalled, which is your HumanRank score. For a Human Benchmark score, add one.
Percentiles from the 24,084 results Human Benchmark grades number memory scores against, read on October 19, 2026. The two tests do not time numbers the same way (see below), so read a HumanRank score as a close estimate on this scale, not an exact match.
Miller's 1956 paper in Psychological Review, The Magical Number Seven, Plus or Minus Two, rounded up dozens of experiments in which people heard a list once and repeated it. Whether the items were digits, letters or words, most people topped out around seven, give or take two.
In 2001, Nelson Cowan argued in Behavioral and Brain Sciences that the real limit is closer to four chunks. Seven only looks possible because we quietly group things: 1-9-8-4 becomes a year, 0-0-7 becomes a name. A chunk can hold several digits, so the bigger your chunks, the longer the number you can carry.
The online test leaves room for exactly that. Human Benchmark shows each number for 1 second plus 0.8 seconds per digit, so an 8-digit number stays up for 7.4 seconds: enough to read it twice and split it into groups. And people who take a memory test for fun are not a random sample of humanity.
Language plays a part too. Much of your digit memory runs on a short loop of inner speech, and some languages say their digits faster. In a 1986 study in Cognition, Chinese schoolchildren remembered at least two more digits on average than American or Japanese children, and Chinese number words took significantly less time to pronounce than English ones.
So the scale shifts by one, the shorter look makes long numbers harder on HumanRank, and the two spare lives forgive a slip on a length you can usually handle. Past 10 digits, 3 seconds is barely enough to read the number once, so a big HumanRank score has to come from fast chunking rather than rereading.
In a study published in Science in 1980, psychologists K. Anders Ericsson and William Chase of Carnegie Mellon University had an undergraduate, Steve Faloon, listen to random digits read at about one per second and repeat them back. He started where most people do, at about seven digits. After more than 230 hours of practice, he could recall 79 digits.
His raw memory did not change. His coding did. Faloon was a competitive runner, and he learned to hear digits as race times: 3492 became 3 minutes 49.2 seconds, a near world-record mile. With a library of times to hang them on, groups of three and four digits turned into single chunks, exactly what Cowan's four-chunk limit predicts.
Memory athletes push the same idea much further. In the spoken numbers event of the World Memory Championships, digits are read aloud at one per second, Faloon's pace. Guinness World Records lists 547 digits, recalled by Ryu Song I of North Korea in 2019.
Once you have a clean run, compare it with the table above, then see where it ranks on the number memory leaderboard. If you like this kind of challenge, the sequence memory and verbal memory tests stretch the same short-term memory with patterns and words, and the chimp test average score shows how your memory compares with a chimpanzee's.
About 9 on Human Benchmark, where the median of 24,084 results is 9 and the mean is 9.3. Human Benchmark scores the level you fail, so the typical player remembers 8 digits. HumanRank scores the longest number you recall, so the same run is an 8 here.
Remembering 9 digits beats about 58% of players, 10 digits beats 76%, and 12 digits puts you in the top 7%. Recalling 17 digits or more is top 1% territory.
About seven in classic lab tests, where a list is heard once: George Miller described it in 1956 as seven, plus or minus two. On online tests that leave the number on screen for several seconds, the typical player remembers 8 digits, and about 82% reach at least 7.
Roughly, for unrelated items heard once. Later research by Nelson Cowan puts the real limit nearer four chunks, and a chunk can hold several digits. That is why grouping and practice push digit span far past seven: one student, Steve Faloon, reached 79 digits.
For digits read aloud at one per second, Guinness World Records lists 547, recalled by Ryu Song I of North Korea at the 2019 World Memory Championships. In psychology, the classic case is Steve Faloon, who went from 7 to 79 digits after more than 230 hours of practice.
