IQ — Intelligence Quotient — is a score derived from standardized tests designed to measure human intelligence. The average is set at 100, with a standard deviation of 15. But what does a specific number actually mean about your cognitive ability?
The IQ Scale: Every Range Explained
What Does an Average IQ of 100 Mean?
The "average IQ of 100" is not a fixed measurement — it's a design choice. IQ tests are periodically renormed so that the average score for the current population equals exactly 100. This means an IQ of 100 today means you scored exactly in the middle of everyone who took the test recently.
The standard deviation of 15 means that about 68% of people score between 85 and 115, and about 95% score between 70 and 130.
Is 110 a Good IQ Score?
Yes. An IQ of 110 puts you in the top 25% of the population — significantly above average. People with IQ scores in the 110–120 range typically excel academically, pick up new skills quickly, and perform well in cognitively demanding careers.
Is 120 a Good IQ Score?
An IQ of 120 is in the "Superior" range — top 9% of the population. This is the typical IQ range of doctors, lawyers, engineers, and other high-achieving professionals. It represents genuinely above-average intelligence that confers real advantages in complex cognitive tasks.
What IQ Score Is Considered Genius?
There's no universal definition of "genius" IQ, but most psychologists place the threshold around 130–140. Mensa, the high-IQ society, requires a score in the top 2% — which is roughly 130+ on most tests. Scores above 145 are extraordinarily rare (about 1 in 1,000 people).
That said, IQ is not the only component of genius. Many high-achieving people — artists, entrepreneurs, athletes — succeed through creativity, persistence, and domain-specific talent rather than raw IQ score.
Does IQ Change Over Time?
Yes, in several ways:
- Childhood to young adulthood: IQ scores tend to increase as the brain develops, peaking in the mid-20s
- Adulthood: Crystallized intelligence (accumulated knowledge) continues to grow; fluid intelligence (novel problem solving) gradually declines after 30
- With training: Targeted cognitive training can meaningfully improve performance on IQ-style tasks
- Flynn Effect: Average IQ scores have risen approximately 3 points per decade over the past century, likely due to better nutrition, education, and cognitive stimulation
IQ Score vs. Emotional Intelligence
IQ measures logical-analytical intelligence. It does not measure emotional intelligence (EQ), creativity, social skills, practical wisdom, or many other aspects of human capability that matter enormously for life success. Research by Angela Duckworth and others suggests that grit and self-control predict long-term success as well as or better than IQ in many domains.
How to Test Your IQ for Free
The most accessible way to get an IQ estimate today is through an adaptive online test like Cebear. It covers all 8 major cognitive domains, adjusts difficulty to your level, and gives you a score that improves in accuracy the more you play — all free, no signup required to start.
Related Articles
- Free IQ Test Online — Accurate, Instant Results
- How to Increase Your IQ: What Science Says
- The Best Brain Training Games of 2026
📈 Track Your IQ Over Time
Cebear shows your IQ history so you can watch it improve as you train. Free account, no credit card.
Start Training Free →