A number flashes, you type it back, and each round adds a digit. This is the classic digit-span test behind the famous “seven, plus or minus two” finding — most people’s short-term memory holds 5 to 9 items. The test finds your exact ceiling in about two minutes, and the score is very shareable.
▶ START THE TEST| Classic human range | 5–9 digits |
| The famous finding | 7 ± 2 |
| Strong score | 10+ digits |
| Time to find your limit | ~2 minutes |
The classic research answer is seven plus or minus two — most people reliably hold 5 to 9 digits in short-term memory. Chunking (grouping digits) is how people push past it.
Practice improves your score at the test itself, mostly through chunking strategies. Broader memory transfer is debated — but climbing your own ceiling is the fun part.
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