The Average IQ of a Chimpanzee: How Smart Are They?

Why "Chimp IQ" Is a Category Error

A human IQ score is only meaningful because it compares one person against a large, carefully sampled human population, with the mean fixed at 100 and a standard deviation of 15. There is no equivalent reference population of chimpanzees, no bank of chimp-appropriate questions, and no way to strip out the fact that a test animal was raised and coached by humans. So a sentence like "a chimp has an IQ of 40" is not a measurement, it is a metaphor, and usually a misleading one.

The encephalization quotient makes the point in another way. Humans sit at roughly 7.4 to 7.8, meaning our brains are seven to eight times larger than expected for a mammal our size. Chimpanzees come in around 1.7. That gap is real and matters for abstract reasoning and language, but EQ is also a blunt tool: gorillas actually score lower than chimps on EQ yet perform comparably on many cognitive tasks, so brain-size ratios alone do not decide who is "smarter." Intelligence is not one dial you can turn up or down.

The Real Evidence That Chimps Are Smart

Strip away the IQ framing and the case for chimpanzee intelligence is strong, and it comes from peer-reviewed field and lab science rather than folklore.

Tool use, with regional traditions. More than any animal other than humans, chimpanzees devise and use technology to get food. The classic example is termite fishing: a chimp selects a grass stalk or twig, strips it down, and pushes it into a termite mound to pull out insects. Crucially, different communities do this differently, passing techniques from mother to offspring, so primatologists describe chimps as having local tool "cultures." That is problem-solving plus social learning, not instinct alone.

Split-second memory that beats us. This is the famous one. In a 2007 study by Sana Inoue and Tetsuro Matsuzawa at Kyoto University, a young chimpanzee named Ayumu was trained to touch the numerals 1 through 9 on a screen in order. When the numbers flashed for just 210 milliseconds and were then hidden behind white squares, Ayumu could still tap them in the right sequence with accuracy that adult humans in the same task could not match. His photographic, snapshot-style working memory outperformed college students. The honest caveat matters too: Ayumu had extensive practice while the humans had almost none, and later work suggests well-trained humans can close much of the gap. But for rapid visual working memory, the chimp is genuinely formidable.

Self-awareness. Since Gordon Gallup's original 1970 mark test, chimpanzees have reliably recognized themselves in a mirror, touching a spot marked on their own face that they can only see in the reflection. Humans, chimpanzees, and orangutans are among the very few species that pass. Self-recognition is one working marker of self-awareness, and chimps clear it, typically the way human toddlers begin to around 18 to 24 months.

How Chimps Compare to Humans and Other Apes

Compared to humans, the sharpest finding comes from a 2007 Science study led by Esther Herrmann. Testing 2.5-year-old children against chimpanzees and orangutans, the team found that toddlers and apes performed about equally on physical tasks, understanding space, quantities, and cause and effect. Where the children pulled decisively ahead was social cognition: imitating a solution, following a pointing gesture, reading intentions. In other words, chimps are not a slower version of us; they are strong on "how the physical world works" and comparatively weaker on the cultural, social learning that lets human knowledge snowball across generations.

Compared to other great apes, rankings are shaky and task-dependent. Chimpanzees and bonobos, our two closest living relatives, are broadly the benchmark for non-human cognition, with orangutans and gorillas close behind. Simple "chimps are smarter than gorillas" claims do not hold up well, since 2025 research found gorillas matching chimps on body self-awareness tasks. Treat any strict ape ranking with suspicion.

The Honest Bottom Line

Chimpanzees do not have an average IQ, because IQ is a human measuring stick and there is no chimp population to norm it against. But by every tool scientists actually use, tool use, memory, self-awareness, and physical reasoning, chimps are among the most intelligent animals alive, roughly toddler-level in some domains and superhuman in the narrow slice of rapid visual memory. The right conclusion is not "a chimp is about as smart as a young child." It is that intelligence comes in shapes our own tests were never built to see, as of 2026.

Curious how the human version of this actually works, the one where 100 really does mean average? You can try a properly human-normed IQ test yourself.

Frequently Asked Questions

Q: What is the average IQ of a chimpanzee?

A: There is no true average IQ of a chimpanzee, because IQ tests are standardized only on humans. Any single number you see quoted for "chimp IQ" is a metaphor, not a measurement, since there is no chimpanzee reference population and no chimp-appropriate test bank. By the cognitive measures scientists do use, chimps rank among the smartest non-human animals.

Q: Are chimpanzees smarter than humans at anything?

A: Yes, at rapid visual working memory. In the 2007 Ayumu experiments at Kyoto University, a trained chimpanzee recalled the positions of numerals flashed for a fraction of a second more accurately than adult humans. Note that Ayumu was heavily practiced and the humans were not, and trained humans can narrow the gap, but the result is real and repeatedly demonstrated.

Q: How smart is a chimp compared to a human child?

A: Roughly toddler-level on physical tasks, but not on social ones. A 2007 study found 2.5-year-old children and chimpanzees performed about equally on tests of space, quantity, and cause and effect. Human children pulled ahead specifically on social learning, such as imitation and following gestures, which is where chimp and human minds most diverge.

Q: Can chimpanzees recognize themselves in a mirror?

A: Yes. Since the original 1970 mark test, chimpanzees have reliably recognized their own reflection, one of only a handful of species, alongside humans and orangutans, to do so. Mirror self-recognition is one accepted marker of self-awareness, though it is only one measure among several.

References

• Inoue, S., & Matsuzawa, T. (2007). Working memory of numerals in chimpanzees. Current Biology, 17(23), R1004-R1005.
• Herrmann, E., Call, J., Hernandez-Lloreda, M. V., Hare, B., & Tomasello, M. (2007). Humans have evolved specialized skills of social cognition: The cultural intelligence hypothesis. Science, 317(5843), 1360-1366.
• Gallup, G. G. (1970). Chimpanzees: Self-recognition. Science, 167(3914), 86-87.
• Anderson, J. R., & Gallup, G. G. (2015). Mirror self-recognition: a review and critique of attempts to promote and engineer self-recognition in primates. Primates, 56(4), 317-326.

Last updated: July 13, 2026