The WAIS test
When people talk about a real IQ test, this is usually what they mean. The Wechsler Adult Intelligence Scale is administered one to one by a psychologist, takes over an hour, and produces far more than a single number.
What it is
The Wechsler Adult Intelligence Scale, now in its fourth and fifth editions depending on region, is the instrument clinicians reach for when a real number is needed. David Wechsler built the original in 1955, having already replaced the ratio scoring method that made the name IQ misleading.
It is not a longer version of an online quiz. It is a structurally different exercise.
What a session actually involves
You sit across from a psychologist for somewhere between an hour and ninety minutes. There is no screen and no answer sheet you fill in alone.
The subtests are varied and some are unlike anything in an online test. You define words. You explain what two concepts have in common. You repeat sequences of digits forwards and backwards. You arrange blocks to match a pattern against a timer. You answer general knowledge questions.
Crucially, the examiner is watching how you work, not only what you get right. Whether you give up early, whether you talk yourself through a problem, whether errors cluster in a pattern. That observation is a substantial part of what a clinical assessment produces and is the single thing no automated format can replicate.
The four index scores
The composite full-scale IQ is the headline, but clinicians frequently care more about the profile underneath it.
| Index | What it samples |
|---|---|
| Verbal comprehension | Vocabulary, reasoning about concepts, accumulated knowledge |
| Perceptual reasoning | Non-verbal problem solving, spatial reasoning |
| Working memory | Holding and manipulating information in the moment |
| Processing speed | How quickly simple visual tasks are completed |
A person with a very high verbal index and a much lower processing speed index has a meaningfully different profile from someone with the same composite achieved evenly, and that difference can matter diagnostically. The verbal and perceptual split maps loosely onto crystallized and fluid ability.
Composite scores use the standard scale, so the same bands and percentiles apply as anywhere else.
What it costs and how to get one
You cannot buy the test. Publishers restrict sales to qualified users, because item security is what keeps the norms valid.
Access is through a psychologist, usually privately. Costs vary widely by country and by how much written reporting is included, but private assessments commonly run from several hundred into four figures. Some are covered where there is a clinical reason, such as an assessment for a learning difficulty or a cognitive concern following illness.
If you need a result for a formal purpose, this is the route. There is no substitute, and no online test qualifies. That includes the requirement for Mensa, which accepts supervised results only.
When you do not need one
For curiosity, this is a lot of money and time to spend on a number.
A well-built screener places you in a band reliably, and a band is the honest unit of meaning even on a clinical test. Our free IQ test takes about ten minutes and reports a score, a percentile and a rarity figure, with the scoring documented on our methodology page. What it cannot give you is subtest profiles, examiner observation, or anything a school or clinic will accept.
Knowing which of those you actually need is most of the decision.
Key takeaways
- The WAIS is the standard clinical IQ test for adults, administered one to one by a qualified professional.
- Sessions run 60 to 90 minutes and cannot be taken online or self-administered.
- It reports four index scores as well as a composite, and the profile often matters more than the total.
- The examiner observes strategy and error patterns, which no automated test can reproduce.
- Access is through a psychologist and typically costs from several hundred upwards.
- For curiosity rather than a formal requirement, a screener is sufficient.