Fluid Intelligence Test (VNR)

This test presents the verbal and numerical reasoning (VNR) battery of the UK Biobank, a major long-term biomedical study that recruited half a million UK adults. The battery — which the UK Biobank also labels its fluid intelligence test — asks the respondent to solve as many reasoning problems as possible within a strict two-minute window. A 13-question version was first administered on touchscreens at the study's assessment centres, and the extended 14-question version presented here was subsequently completed online by 211,604 participants. Because so many people have taken exactly these questions under exactly this time limit, the battery offers something very rare among free online tests: a genuine, large-sample benchmark for your score.

Fluid intelligence is the ability to reason, spot patterns, and solve problems that do not depend on knowledge you have already acquired. Psychologists contrast it with crystallized intelligence — the accumulated store of facts, vocabulary, and skills that keeps growing over a lifetime. Fluid ability is central to what intelligence researchers call general cognitive ability, and it is the component most sensitive to aging: it typically peaks in early adulthood and declines gradually thereafter. The VNR battery samples it through several classic problem types: mental arithmetic, number sequences, verbal analogies, synonyms and opposites, logical syllogisms, and family-relationship puzzles.

The battery's brevity is deliberate. It was designed to capture a usable measure of reasoning ability in two minutes from hundreds of thousands of volunteers, and validation research has shown that it succeeds: despite containing only a handful of items, scores correlate substantially with much longer, standardized cognitive test batteries and show good retest stability. The battery has since become one of the most heavily used cognitive measures in science — studies drawing on it have mapped the genetics of intelligence in hundreds of thousands of people, tracked how reasoning relates to health outcomes, and probed the links between cognitive ability, brain structure, and aging.

Scoring is simple: one point per correct answer, for a total from 0 to 14, with no penalty for guessing or skipping. In the UK Biobank's online cohort the average score was 5.16 (standard deviation 1.75), the median participant answered 5 questions correctly, and only one in ten participants scored 8 or higher. Bear the time pressure in mind when interpreting your result — the score reflects speed as well as accuracy, and most participants simply run out of time before reaching the later questions. Note also that the reference cohort consists of UK adults who were between 40 and 69 years old when recruited, and volunteers for medical research tend to score somewhat above the true population average.

Your result is reported as a raw score out of 14 alongside the UK Biobank cohort average, with bands anchored to the cohort's published score distribution. The result is a reasoning score, not a full-scale IQ: a comprehensive IQ assessment samples many more abilities — spatial, verbal, memory, processing speed — and requires far more than two minutes. Treat your band as an indication of how your quick verbal-numerical reasoning compares with a very large, well-documented cohort, not as a clinical measurement.

This test is provided for educational and entertainment purposes only. It is not a clinical instrument, and this website is not affiliated with the UK Biobank or the University of Edinburgh. Cognitive performance on any single timed sitting is influenced by fatigue, distraction, language fluency, and familiarity with test formats.

References

• Sudlow, C., Gallacher, J., Allen, N., Beral, V., Burton, P., Danesh, J., Downey, P., Elliott, P., Green, J., Landray, M., Liu, B., Matthews, P., Ong, G., Pell, J., Silman, A., Young, A., Sprosen, T., Peakman, T., & Collins, R. (2015). UK Biobank: An open access resource for identifying the causes of a wide range of complex diseases of middle and old age. PLoS Medicine, 12(3), e1001779.
• Fawns-Ritchie, C., & Deary, I. J. (2020). Reliability and validity of the UK Biobank cognitive tests. PLoS ONE, 15(4), e0231627.
• Lyall, D. M., Cullen, B., Allerhand, M., Smith, D. J., Mackay, D., Evans, J., Anderson, J., Fawns-Ritchie, C., McIntosh, A. M., Deary, I. J., & Pell, J. P. (2016). Cognitive test scores in UK Biobank: Data reduction in 480,416 participants and longitudinal stability in 20,346 participants. PLoS ONE, 11(4), e0154222.