Intelligence tests
An intelligence test measures reasoning ability - how well you solve novel problems, spot patterns and work with information. A modern IQ test does this across several cognitive domains and reports the result against the general population.
Intelligence is one of the most studied and most misunderstood ideas in psychology. A good cognitive test is a genuinely useful measure of reasoning ability, but it is also narrow: it captures a real and important slice of how you think, not the whole of your mind or your worth. This guide explains what these tests measure, what they do not, and how the related ideas fit together.
The core: an IQ test
An IQ test measures general cognitive ability - the reasoning power that tends to show up across very different kinds of problems. Modern tests sample several domains, such as verbal, numerical, spatial and abstract reasoning, and combine them into a single score that is placed on a scale centred on the population average.
IQ is one of the better-validated measures in all of psychology: it is reasonably stable over time and predicts outcomes like academic and job performance better than most single measures. That is precisely why it deserves to be read carefully rather than treated as a verdict on a person.
What an IQ score does not capture
An IQ score is a measure of reasoning ability, not of character, creativity, wisdom, motivation or how good a person is. It says little about whether you will work hard, treat people well, or find meaning in what you do, and it can be affected by tiredness, anxiety, language and how much practice you have had with test-style problems.
Two related ideas are often confused with intelligence but measure something different. Need for cognition is about how much you enjoy and seek out demanding thinking - a motivation, not an ability. Emotional intelligence is about identifying and managing emotions in yourself and others - a separate kind of intelligence that an IQ test does not touch.
A related kind of intelligence
When people talk about being "smart", they often mean something an IQ test never measures: reading the room, staying calm under pressure, understanding what other people feel. That territory belongs to emotional intelligence, which is worth measuring in its own right alongside cognitive ability.
Benchmark your reasoning
Take a short, well-built IQ test that scores your reasoning across four cognitive domains and shows where you stand against the general population.
Frequently asked questions
What does an IQ test actually measure?
An IQ test measures general cognitive ability - your capacity to reason, spot patterns and solve novel problems. Modern tests sample several domains (such as verbal, numerical, spatial and abstract reasoning) and combine them into a single score placed against the general population.
Is IQ the only kind of intelligence?
No. An IQ test captures reasoning ability, but it does not measure emotional intelligence (identifying and managing emotions), creativity, wisdom or motivation. Emotional intelligence in particular is a distinct, separately measurable kind of intelligence.
What is the difference between intelligence and need for cognition?
Intelligence is an ability - how well you can reason. Need for cognition is a motivation - how much you enjoy and seek out demanding thinking. Someone can have strong reasoning ability but little appetite for effortful thought, or the reverse.
Can you improve your IQ score?
Practice with test-style problems, good rest and lower anxiety can improve your measured score somewhat, and education has long-term effects on cognitive skills. But an IQ test is designed to be fairly stable, so a single score is best read as an estimate with a margin of error, not a fixed label.