How many digits can you remember? The average person can hold about 7 in short-term memory. Let's find your limit.
The Number Memory Test is a free online tool that measures your forward digit span — the longest sequence of digits you can remember in order after seeing them once. The average person can hold about 7 digits in short-term memory, a finding known as Miller's Law. This test starts at 3 digits and adds one more each round until you make a mistake, revealing your true memory capacity.
A number flashes on screen for a limited time — starting at 2 seconds for 3 digits, increasing by 0.5 seconds per additional digit (up to 7 seconds max). After the number disappears, you type it from memory. Get it right and the next round adds one more digit. One wrong answer ends the game. Your final score is the longest sequence you successfully recalled.
The average person can hold about 7 digits in short-term memory, a finding known as Miller's Law (7 plus or minus 2). Most people can reliably remember between 5 and 9 digits. With techniques like chunking, some people can recall significantly more.
Digit span is a measure of short-term memory capacity — specifically, the longest sequence of digits a person can recall in correct order after seeing or hearing them once. It is measured by presenting increasingly longer number sequences until the person makes an error. This number memory test measures your forward digit span.
You can improve number memory through techniques like chunking (grouping digits into smaller units, like phone numbers), creating associations or stories with the numbers, using the method of loci (memory palace), and regular practice. Studies show consistent training can extend digit span by 2-3 digits over several weeks.
If you enjoyed this, try these: Sequence Memory · Memory Test · Chimp Test · Verbal Memory
Last updated: March 2026 · whatifs.fun — Free interactive games, experiments & simulations