IQ Bell Curve Calculator
Enter an IQ score. The tool plots you on the Wechsler normal distribution (mean 100, standard deviation 15) and tells you your percentile, your rarity, and where you sit relative to the rest of the population.
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Take our free IQ test, then come back here and plot your real score on the curve.
Take the Free IQ TestHow to read the IQ bell curve
IQ scores are designed to follow a normal distribution. By construction, the average score is 100 and one standard deviation is 15 points. That gives the shape you see in the curve above.
Two-thirds of all people score between 85 and 115, one standard deviation around the mean. Around 95% score between 70 and 130, two standard deviations. The tails, below 70 and above 130, hold the remaining 5% combined.
Percentile means the share of the population you scored at or above. An IQ of 130 puts you at roughly the 98th percentile, meaning 98% of people score lower. An IQ of 145 sits beyond 99.9%, fewer than 1 in 1,000.
Important caveat: IQ measures a specific kind of abstract reasoning under timed conditions. It correlates with academic and some career outcomes, but it does not measure creativity, emotional intelligence, persistence, or wisdom. High IQ helps. It does not guarantee anything by itself.