A sequence of digits will flash on screen. Memorize them, then type them back. Each correct round adds one more digit. The average is 7 digits.
Press Start to begin. You'll see a number, memorize it, then type it back.
Working memory is your brain's ability to hold and manipulate information in the short term. George Miller's famous research found that the average human can hold 7 ± 2 items in working memory at once — known as "Miller's Law." People who score 9+ digits are in a small elite.
Working memory is strongly correlated with general intelligence and academic performance. Complement this test with the Reaction Time Test for a full cognitive speed profile, and check your Dashboard for trends.
Number Memory tests your verbal working memory span — how many digits you can hold in short-term memory and accurately recall in order. It directly mirrors the Digit Span Forward subtest of the Wechsler Adult Intelligence Scale (WAIS-IV), one of the world's most widely used IQ batteries. George Miller's landmark 1956 paper "The Magical Number Seven, Plus or Minus Two" established that human working memory holds 7 ± 2 items — and our test data consistently confirms this with a global average of 7 digits.
Working memory is not merely a trivia measure — it predicts academic performance, fluid intelligence, reading comprehension, and the ability to follow multi-step instructions. Individuals with higher digit spans tend to perform better on standardized tests, learn new languages more easily, and process complex information with less cognitive fatigue.
Working memory capacity itself is difficult to expand, but chunking — grouping individual digits into meaningful units — effectively multiplies your usable span. A phone number like 9821045678 becomes three chunks (982 / 1045 / 678) rather than ten individual digits. Memory champions use elaborate chunking systems to recall hundreds of digits, but even basic grouping can push a 7-digit span to apparent 10-digit performance.
For a related test using spatial rather than verbal memory, try the Corsi Block Test. Most people find their verbal span slightly exceeds their spatial span — a consistent finding across thousands of studies. The Digit Span Test adds a backward condition, which is even more diagnostic of working memory capacity.