Free Memory Tests

Memory is not one thing

People talk about having a good or bad memory as though it were a single dial. It is not. The system that holds a phone number for ten seconds is physically different from the one that stores what you did last summer, and both are different again from the one that recognises a face without producing a name. This matters practically: someone who scores poorly on digits may be excellent at faces, and neither result predicts the other. The tests here separate the kinds so you get a profile instead of a single misleading number.

What each test measures

The magic number is smaller than you think

The famous figure is seven items, from a 1956 paper that has been quoted ever since. More careful work since then puts raw capacity closer to four. The gap is explained by chunking: you do not hold 4 1 9 2 7 3 as six items, you hold 419 and 273 as two, and every practised memoriser is doing this whether they notice or not. That is why grouping digits in threes lifts most people's number memory score immediately, and why the improvement plateaus — you are getting better at packing, not at carrying.

Why your span changes hour to hour

Working memory is unusually sensitive to state. A poor night's sleep costs most people a full item. Background speech is far more disruptive than background noise, because language competes for the same store. Stress narrows it, caffeine helps slightly and then stops helping, and simply being on your fourth test in a row costs measurable capacity. A two-level swing across one afternoon is completely normal, which is why a single attempt is a weak measurement and your range across several is a much better one.

Strategies that genuinely raise your score

• Chunk in threes. Two chunks of three beat six separate items every time.
• Turn positions into shapes. On sequence and visual memory, a route or a letter shape survives far better than a list of squares.
• Say it once, then stop. Rehearsing aloud helps digits and actively hurts spatial tasks, because the two compete.
• Attach meaning. 1969 is a year, not four digits. Any existing memory you can hook onto is free capacity.
• Do not chase the record. Fatigue costs more than technique gains after three or four attempts.

Does memory span relate to intelligence?

There is a real relationship, and it is smaller at the level of one person than population statistics suggest. Working memory and reasoning share something — plausibly the ability to hold several things in mind while combining them — but plenty of strong reasoners have an ordinary span. If you want an ability estimate rather than a capacity measurement, take the free IQ test. If you are curious about the attention side rather than storage, the n-back test is the purest task on this site.