What Is a Cat's Average IQ? Examining the 'Two- to Three-Year-Old' Claim

'What is a cat's average IQ?' has a clear answer: there is none. Saying only that leaves the obvious follow-up, though—where does the widely repeated 'two- or three-year-old' figure come from? This article traces it.

Why the average IQ is 100, and why that cannot transfer to cats

Human IQ is produced by refitting the score distribution of a same-age group onto a normal distribution with a mean of 100 and a standard deviation of 15. The mean is 100 by definition, not by discovery (what is the average IQ?).

Carrying that machinery over to cats would require administering one identical test to a large number of cats and collecting the score distribution. No such standardization has been done. So 'the average IQ of cats' is not an unknown value—it is a value for which the raw material has never been assembled.

Where 'like a two- or three-year-old' comes from

Most versions of this phrase trace back to object permanence research. Human infant cognitive development is described in stages, and a cat's task performance can be mapped onto one of those stages.

But matching a stage is not matching cognition as a whole. Cats process far finer information than humans through smell and hearing, and their motor control in hunting far exceeds a toddler's. Meanwhile, language and symbolic tasks cannot even be administered. Loading a creature with a differently shaped profile of strengths onto a single age axis does not work (can a cat's IQ be converted to a human age?).

The cat's brain by the numbers

One figure that can be compared objectively is neuron count. Jardim-Messeder and colleagues (2017) estimated cortical neuron numbers across carnivorans and reported about 250 million in cats and about 530 million in dogs. The same study showed that a brown bear, whose brain is far larger than a cat's, has a comparable neuron count to a cat.

The lesson is that brain size and neuron count are not proportional, and that neuron count itself is not an intelligence score. Even in humans, the correlation between brain volume and intelligence is weak.

The review's message: how much is still unknown

The review by Vitale Shreve and Udell (2015) notes that cat cognition research is far scarcer than dog research and that many domains remain untested. There simply is not enough accumulated data to produce an average.

Home-based designs have grown in recent years, and individual abilities such as name discrimination and social referencing have accumulated findings (can feline intelligence be measured as IQ?). Still, no framework for a composite score has been proposed.

Why we want a number, and the trap it sets

Wanting one number to summarize ability is a natural impulse. Even with human IQ, people look at a composite and miss the shape of their strengths and weaknesses (types of cognitive ability). For cats, the basis for comparison does not exist at all.

The feeling that 'my cat is clever' usually comes from watching that cat do what it is good at. That observation is accurate. Being unquantifiable and lacking ability are different things.

What can be measured is human IQ

A cat's IQ cannot be measured, but human IQ can be estimated with standardized methods. The free NekoIQ IQ test measures spatial reasoning, pattern recognition, logical inference, and classification in 20 questions and about 10 minutes. Results are estimates for self-understanding and are not a substitute for an official intelligence test.