IQ measures cognitive ability — logical reasoning, pattern recognition, verbal comprehension, spatial awareness and memory. Average is 100. Most people score 85–115.
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IQ (Intelligence Quotient) measures cognitive ability relative to the population. The average is 100, with a standard deviation of 15. SmartCheckIQ uses the Cattell-Horn-Carroll (CHC) framework — the most widely validated intelligence theory, covering fluid reasoning, crystallised intelligence, working memory, and processing speed.
| Score | Category | Population % |
|---|---|---|
| 145+ | Genius | 0.1% |
| 130–144 | Very Superior | 2.1% |
| 120–129 | Superior | 6.7% |
| 110–119 | High Average | 16.1% |
| 90–109 | Average | 50% |
| 80–89 | Low Average | 16.1% |
| Below 80 | Below Average | 9% |
| Age | Avg IQ | Note |
|---|---|---|
| 16–24 | 108 | Peak fluid reasoning |
| 25–34 | 105 | Verbal peaks here |
| 35–44 | 104 | Crystallised IQ grows |
| 45–54 | 101 | Experience advantage |
| 55–64 | 99 | Processing slows |
| 65+ | 95 | Wisdom compensates |
Yes, 100% free with no hidden paywalls. Your IQ score, percentile, and bell curve position are always shown immediately. Pro membership unlocks the detailed cognitive breakdown, unlimited retests, games, and certificate.
Our test is calibrated using CHC psychometric principles and normed against 2M+ test-takers. Results typically fall within ±5 IQ points of professional assessments. For clinical diagnosis, always use a certified psychologist.
Mensa requires the top 2% — approximately IQ 130+. Our test serves as a Mensa practice indicator. If you score 130+, we'll show you a Mensa readiness badge. Official Mensa admission requires a supervised test.
Fluid IQ is largely genetic but processing speed and working memory respond to training. Our Brain Games are designed to target these areas. Regular practice can improve your test performance by 5–10 points.
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