Number Memory Test — Free Online Digit Span Checker
A number memory test measures digit span — the longest sequence of digits a person can accurately recall immediately after seeing it once, a standard measure used in cognitive psychology. Starting at 3 digits, each correct recall adds one more digit. See how your digit span compares to the average of 7 ± 2 digits. 100% client-side — nothing leaves your browser.
How to Use the Number Memory Test
- Click Start — a sequence of digits appears on screen
- Memorize the digits — they disappear after roughly one second per digit
- Type the digits from memory into the input field and click Submit or press Enter
- Correct — the next round adds one more digit. Incorrect — the test ends
- Your score is the longest sequence you recalled correctly (your digit span)
Digit Span Benchmarks
The average adult digit span is commonly cited around 7 ± 2 digits (Miller's Law, 1956). Here is how scores are generally categorized:
These ranges reference Miller's classic 1956 finding on short-term memory capacity. Individual results vary. Last updated: June 20, 2026
Why Use This Number Memory Test
This test follows the standard digit-span format used in cognitive psychology research. Digits are generated purely randomly — no patterns, no area codes, no memorable sequences — so your score is a genuine measure of short-term recall, not pattern recognition.
The view time scales with sequence length (roughly one second per digit) so you always have the same relative exposure. After the digits disappear, the display clears completely before the input field appears, leaving no residual visual cues.
Your personal best digit span is saved in your browser's local storage — no account needed, no data sent anywhere.
Frequently Asked Questions
Digit span is a standard cognitive-science measure of short-term memory capacity. It is the longest sequence of digits a person can recall immediately after a single presentation. The concept dates to the early days of experimental psychology and is still used in modern cognitive assessment, including as a subtest of the Wechsler Adult Intelligence Scale (WAIS).
Most adults can recall 7 ± 2 digits, a finding known as Miller's Law from George A. Miller's influential 1956 paper. A score of 5–6 digits is average, 7–8 is good, and 9+ is above average. Scores above 11 are rare and considered exceptional. However, individual results vary widely based on age, attention, familiarity with digit-span tasks, and other factors.
Short-term memory capacity is limited by how much information the brain can actively hold in conscious awareness at once. Miller's 1956 paper famously proposed the "magic number seven" as a typical upper bound. Modern research suggests the limit is closer to 4 ± 1 chunks when other cognitive demands are present, but the 7 ± 2 range remains the commonly cited reference for simple digit-span tasks.
Practice can improve your performance on digit-span tests, though there is debate about whether this reflects a genuine increase in memory capacity or simply better strategies (such as chunking digits into groups). Regular practice with varied sequences may help, but gains tend to be task-specific rather than generalizing to all forms of short-term memory.
This test uses the same underlying digit-span format — a sequence of random digits shown once and recalled from memory — that has been used in cognitive research for over a century. However, this is not a clinical diagnostic tool. Clinical digit-span tests (such as the WAIS digit span subtest) are administered under controlled conditions and include forward and backward recall components. This tool is for educational and self-assessment purposes only.
Use Cases
Cognitive Self-Assessment
Measure your short-term memory capacity and track how it changes with sleep, stress, and lifestyle factors over time.
Brain Training Baseline
Establish a baseline digit span before starting a memory training regimen and measure whether your capacity improves with structured practice.
Educational Demonstration
Teachers and students can use this as a live demonstration of Miller's Law and the concept of short-term memory capacity limits.
Personal Curiosity
Compare your digit span against the classic 7 ± 2 finding and see where you fall on the distribution just out of personal interest.