Number Speed Test
Watch a sequence of numbers flash briefly, then type them back. Measures your digit span.
You'll see a sequence of numbers flash on the screen. After they disappear, type them back in the correct order.
Start with 3 digits. Each correct answer adds 1 digit. The test ends when you make a mistake.
About Digit Span
Working Memory
Digit span measures your working memory capacity — how many items you can temporarily hold and manipulate in your mind. It's a key component of intelligence tests like the WAIS.
What's Normal?
Most adults can remember 5-7 digits. George Miller's famous paper "The Magical Number Seven" identified this as the typical limit of short-term memory. Scores of 9+ are exceptional.