What Does an IQ of 87 Mean?
Key facts about IQ 87
- In a random group of 100 people, a score of 87 would typically rank above about 19 of them (the 19th percentile).
IQ 87 in depth
An IQ score of 87 is classified as low average — inside one standard deviation of the mean, which is where the majority of the population sits. About 16% of people score between 80 and 89, and the gap between this score and a dead-average 100 is smaller than it feels: it is within about one standard deviation, a range where day-to-day differences are subtle.
At this level, the score itself rarely constrains life outcomes in any visible way. Most jobs, including many demanding ones, are performed successfully by people across the entire average band. Interest, conscientiousness, and accumulated expertise dominate over small IQ differences here — that is not a consolation line, it is what longitudinal studies consistently find.
It is also worth knowing that scores in this band move. Sleep, stress, effort, and familiarity with abstract puzzle formats each shift results by several points; someone scoring 87 on a first attempt frequently lands 5+ points higher when rested and familiar with the format.
What this range tends to look like day to day
- Ordinary academic and workplace demands are fully manageable
- Novel, highly abstract material may take a few more passes to click
- Practiced skills reach the same ceiling as anyone else’s — expertise compounds
- Test-format familiarity alone can add several points on a retake
The low-average band is one of the most misread ranges: people treat a single-digit gap from 100 as meaningful when it is well inside the test’s noise floor. Two attempts by the same person on different days routinely differ by more than the distance between this score and the exact mean.
IQ 87 on other test scales
Different tests use different standard deviations, so the “same” performance produces different numbers. A 87 on an SD-15 test (Wechsler-style, and this site) corresponds to:
| Scale | Used by | Equivalent score |
|---|---|---|
| SD 15 | Wechsler (WAIS/WISC), most modern tests, this site | 87 |
| SD 16 | Older Stanford–Binet forms | 86 |
| SD 24 | Cattell (used by some high-IQ societies) | 79 |
| Percentile | All scales | 19th |
Where 87 sits among all classifications
| Range | Classification | Share of population |
|---|---|---|
| ≤ 69 | Extremely Low | 2.1% |
| 70–79 | Borderline | 6.5% |
| 80–89 | Low Average ← IQ 87 | 15.6% |
| 90–109 | Average | 49.5% |
| 110–119 | High Average | 16.6% |
| 120–129 | Superior | 7.2% |
| 130–144 | Very Superior (Gifted) | 2.3% |
| 145–159 | Highly Gifted | 0.1% |
| 160+ | Exceptionally Gifted | <0.1% |
How reliable is a score of 87?
Any single IQ score has a measurement error of roughly ±5 points, and scores from unsupervised online tests vary more than professionally administered ones. Treat this number as the middle of a range, not a fixed property of your brain.
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Start the Free IQ TestIQ 87 — common questions
Is an IQ of 87 good?
An IQ of 87 is in the lower part of the average range (19th percentile). One score says much less than people assume: test conditions, language, effort and familiarity with the format all move results substantially — see the reliability notes on this page.
What percentile is an IQ of 87?
On a standard scale with mean 100 and SD 15, an IQ of 87 is at the 19th percentile (z-score -0.87). That means about 81% of people score above it.
How rare is an IQ of 87?
About 1 person in 5 scores 87 or lower. Worldwide, that is on the order of 1,564 million people.
What jobs can someone with an IQ of 87 do?
Almost anything — occupational research finds wide IQ ranges inside every profession. Skills learned through practice and demonstration matter far more than a matrix-test score, and this range is well represented across skilled trades and structured professional roles. A single IQ score is a weak career oracle; interests and accumulated skill dominate.
Can I raise an IQ of 87?
Measured scores move with test familiarity, sleep, stress and effort — often by 5–10 points — so a first online attempt frequently understates ability. Underlying fluid intelligence, however, is stable in adulthood: "brain training" apps have repeatedly failed to raise it. What reliably grows is domain skill and knowledge, which is what actually drives most real-world performance.