Memory Span Test
How many numbers can you hold in your head at once? Watch a sequence of digits, then type them back. This free memory span test measures your own working-memory capacity and compares it to the famous "7 ± 2."
Test your working memory
A line of digits will flash one at a time. When they stop, type them back in the same order.
Sequences get longer each time you're right. The test ends when a length gets the better of you.
Takes about a minute · your result stays private on your device.
Memorize the sequence…
Length: 3 digits
Type the 3-digit sequence you just saw:
Your Memory Span
You reliably recalled
7
digits in a row
What a Memory Span Test Measures
A memory span test measures the capacity of your short-term, or working, memory — the small amount of information you can actively hold and use right now. The digit-span version you just took is the classic method: a sequence is presented, and you reproduce it in order. The longest length you can reliably manage is your span.
Working memory is a bottleneck. Unlike long-term memory, which is effectively unlimited, the amount you can juggle at once is small — which is exactly why this limit is so studied.
The "7 ± 2" Finding
In 1956 George Miller described what he called "the magical number seven, plus or minus two": across many tasks, people could hold about five to nine items at once. That's why your result above is compared to a span of seven. If you landed between 5 and 9, you're right in the typical range.
The key idea for the exam is that the limit is on the number of chunks, not raw symbols. By grouping digits — turning 4-9-1-7 into "forty-nine, seventeen" — you pack more information into each slot. This is chunking, and it's why phone numbers are written in groups.
Memory Span in AP Psychology (Unit 2: Cognition)
Short-term memory capacity, the 7 ± 2 finding, and chunking all live in AP Psychology Unit 2: Cognition. For the exam, be ready to explain that working memory is limited in capacity and duration, and that chunking expands how much you can hold without changing the underlying limit. Doing the test yourself makes that abstract limit something you've actually felt.
Want the bigger picture on exam day? Try the AP Psychology score calculator or run the Stroop test next.
Memory Span Test — FAQ
What is a normal memory span?
About seven digits, give or take two — so roughly five to nine. Landing in that range is typical; it varies with attention, practice, and chunking.
How can I improve my memory span?
Chunk. Grouping individual digits into larger units lets you hold more total information within the same limited number of slots. It's the single most effective trick for span tasks.
Is this an accurate working-memory test?
It uses the standard digit-span method, so the pattern is real, but it's an educational demo rather than a clinical assessment. Your span can shift from run to run depending on focus.
Keep Exploring the Course
Run the Stroop test, or check where your AP Psychology score stands today.
Open the Score Calculator