IQ Test Score Range: What Different Scores Mean
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What Is the Usual IQ Test Score Range?
Most modern IQ tests are centered at 100, with a standard deviation of 15. Scores from about 85 to 115 are often considered the broad average range because they fall within one standard deviation of the mean. Scores above 130 are usually very high, while scores below 70 are often considered very low in many classification systems.
The useful range of a specific test depends on its ceiling, floor, age norms, and scoring rules. A brief online test may display scores from 70 to 160, but that does not mean it can measure the extremes accurately.
Quick answer
Typical IQ scale: average 100, SD 15, broad average range about 85-115, very high around 130+.
Common IQ Test Score Ranges
| IQ range | Approx. percentile span | Common interpretation |
|---|---|---|
| Below 70 | Below 2nd | Very low range on many scales |
| 70-84 | 2nd to 15th | Below average range |
| 85-115 | 16th to 84th | Broad average range |
| 116-129 | 85th to 97th | Above average to high |
| 130-144 | 98th to 99.86th | Very high |
| 145+ | 99.87th+ | Extremely high, if test ceiling supports it |
IQ Ranges and Percentiles
Percentiles are often easier to understand than labels. A score of 115 is around the 84th percentile, 130 is around the 97.72nd percentile, and 145 is around the 99.87th percentile on an SD-15 normal curve. The farther a score is from 100, the rarer it becomes.
Labels such as average, high average, superior, or very superior are not universal. Different publishers use different wording. When precision matters, rely on the score, percentile, confidence interval, and the test manual's own classification table.
Why Score Ranges Need Context
- Scale matters: some tests use SD 16 or a different scoring system.
- Confidence intervals matter: observed scores are estimates.
- Domain profiles matter: verbal, spatial, memory, and speed scores can differ.
- Norm groups matter: age and population comparison affect meaning.
- Test ceilings matter: extreme scores need enough hard items to support them.
Frequently Asked Questions
FAQ
What is the average IQ score range?
A broad average range is often about 85 to 115 on a mean-100, SD-15 scale.
What IQ range is considered high?
Scores around 116-129 are above average to high, and 130+ is often considered very high.
Can IQ scores go above 160?
Some scales report very high numbers, but extreme scores require strong norms and enough difficult items. Many tests are not precise at the far upper tail.
Summary
The standard IQ test score range centers on 100 with SD 15. Around 85-115 is broadly average, 130+ is very high, and 145+ is extremely high if the test supports that range. Always interpret ranges with percentiles, confidence intervals, and the test's own norms.