How to use it
- Press Start: a three-digit number appears.
- Memorize it while the bar runs down, then type it into the box and press Enter.
- Get it right and the next number is one digit longer; the first mistake ends the run.
- Check your score, the percentile estimate and your personal leaderboard, then share the link.
What does the number memory test measure?
This test measures your digit span – one of the oldest and most widely used measures of short-term (working) memory. The question is simple: how many digits can you keep in mind accurately for a few seconds? Psychologists like it because it needs no vocabulary, cultural knowledge or drawing skill, just attention and brief storage.
In our version the number is shown briefly, then hidden, and you type it back from memory. It starts at three digits and grows by one after every correct answer. Your score is the length of the last number you got exactly right. If you nailed six digits but missed seven, your score is 6.
The display time grows with the length of the number (roughly one second plus 0.6 seconds per digit), so even long numbers stay on screen long enough to read in full. The test is about holding on to the number, not about how fast you read.
What's a good score? – a sourced estimate
George A. Miller's famous 1956 paper put the span of short-term memory at about 7 ± 2 items for adults. With digits, most people land between 5 and 9, and 7 is typical. The percentile band under your result uses that idea: a normal distribution with a mean of 7 and a standard deviation of 1.5 to estimate what share of people you beat.
Treat it as an estimate, not a standardized norm. The standard deviation is our assumption, and our task (a visual flash and a typed answer) differs from the lab procedure, where digits are usually read aloud at one per second. That is why the band carries a “weak estimate” label and a link to the source. It helps you place yourself roughly; it shouldn't be used to draw conclusions.
Digit span improves noticeably with practice. People who deliberately group digits (see below) often reach 9–11, and memory athletes using special techniques recall hundreds of digits. In other words, your score reflects strategy as well as raw capacity.
Tricks that genuinely help
- Chunking: instead of 749218, think 749 – 218. Two groups of three are far easier to hold than six separate digits. It's the same reason phone numbers are written in groups.
- Rhythm and sound: say the number to yourself with a beat. Silent rehearsal – the “phonological loop” – is one of the main stores of short-term memory.
- Look for meaning: if a chunk looks like a year, a zip code or a familiar number (1969, 2001, 911), hang on to it.
- Don't rush the typing: your memory keeps fading while you type. Say the number once in your head, then type it at an even pace.
- Take short breaks: fatigue drags scores down quickly. After two or three runs, rest for a minute.
Using these tricks isn't cheating – it's exactly how people remember PINs, license plates and phone numbers in real life.
What makes your score better or worse?
Digit span is sensitive to how you feel right now. Tiredness, poor sleep, stress, background noise or a notification popping up can easily cost you one or two digits. The reverse is also true: rested, in a quiet room and fully focused, you'll do your best.
Your device matters too. On a phone, the number keypad sliding up grabs your attention for a moment, so many people score a digit lower than on a computer. That's why your leaderboard is most meaningful on the same device.
Age plays a role as well: working memory peaks in your twenties and thirties and slowly declines after that, which is perfectly normal. This test is a fun self-check, not a medical or psychological assessment. If forgetfulness is affecting your daily life, talk to a doctor rather than reading anything into an online game.
Sharing and challenges
When a run ends, the Share result link button gives you a link that shows a preview image with your score when pasted into social apps or chats. Whoever opens it lands on this test with a challenge banner showing your result, and can try to beat it. The link only contains the score and the mode name – no personal data, no account and nothing stored on our servers.
If you'd rather post an image, you can download or share the result card as a PNG. Your leaderboard and history live only in your browser; clearing your browsing data removes them.
More memory games: the sequence memory test checks spatial order, the verbal memory test checks word recognition, and the chimp test checks working memory. You'll find all of them on the memory test hub.
Frequently asked questions
What's the average score on a number memory test?
Classic research suggests most adults hold 5–9 digits, with about 7 being average. For our flash-and-type version, treat that as a rough comparison rather than a standardized norm.
Is it cheating to group the digits?
No. Chunking is a natural memory strategy – it's how everyone remembers phone numbers and PINs. If you're curious about your score without strategies, try deliberately not grouping.
Why can't I type letters or spaces?
The box only accepts digits so a stray space or letter can't cost you a round. On phones, the number keypad opens.
Is this a medical test?
No. It's a fun self-check and doesn't replace a neuropsychological assessment by a professional. If you're worried about your memory, see a doctor.
Where are my results stored?
Only in your browser (local storage). A shared link carries the score itself; nothing is stored on a server.
Can practice improve my digit span?
Your score on the test does improve with practice and good strategy, mostly thanks to chunking. Whether that carries over to other tasks is a mixed picture in the research.