IQ 90: meaning, percentile and rarity
An IQ of 90 sits in the average range on the standard scale (mean 100, standard deviation 15). 25.25% of the reference population scores below this level, and 74.75% scores above it.
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- 25.25% of people score below IQ 90, and 74.75% score above it.
- Rarity
- About 1 in 4 people score IQ 90 or lower.
- Distance from the mean
- 10 points below the mean of 100 — about 0.67 standard deviations.
25.25% of people score below IQ 90, and 74.75% score above it.
What range does IQ 90 fall into?
An IQ of 90 sits in the average range.
This is the center of the scale: around half of all people score in the broader average region (90 to 109), and scores near 100 are the most common in the population.
How rare is IQ 90?
About 1 in 4 people score IQ 90 or lower.
Frequently asked questions
- Is an IQ of 90 a good score?
- An IQ of 90 sits in the average range, with about 25.25% of a normal population scoring below it. Whether that counts as good depends on what the score is used for — and no single online result should be treated as a definitive measure of ability.
- How rare is an IQ of 90?
- In a normal distribution, about 1 in 4 people score IQ 90 or lower.
- What percentile is an IQ of 90?
- 25.25% of the reference population scores below IQ 90. That is its percentile rank — a position on a scale from 0 to 100, not the share of questions answered correctly.
This page describes the theoretical normal distribution (mean 100, standard deviation 15) for educational purposes. It is not a clinical assessment or a diagnosis.