Enter an IQ score to estimate percentile rank, rarity, and score band on the standard IQ scale with mean 100 and standard deviation 15.
1 Quick Answer
Updated May 3, 2026 by Structural. An IQ percentile tells you where a score sits relative to the wider population. On the standard SD 15 scale, an IQ of 100 is the 50th percentile, 115 is around the 84th percentile, and 130 is around the 97.7th percentile.
Percentiles are often easier to understand than raw IQ points because they immediately show rarity. Saying "97.7th percentile" usually communicates more than saying "130" on its own, especially when different tests can use different scoring conventions.
Average100
The middle of the standard IQ scale.
SD15
This calculator assumes the standard deviation is 15.
ApproximatePercentiles
Results are estimates based on the normal distribution.
Best Used WithAge Norms
Real interpretation still depends on proper norming and age comparison.
Use the tool below to convert an IQ score into an approximate percentile rank, band label, and rarity estimate.
Range: 40 to 177. The calculator uses a mean of 100 and SD of 15.
Percentile50th
Higher than about 50.0% of scores on the standard IQ scale.
BandAverage
This score falls in the broad middle of the distribution.
Rarity1 in 2
About 1 in 2 people score this high or higher.
InterpretationAverage
Use this as a percentile guide, not as a substitute for proper age-based norms and a full report.
Important: this calculator is approximate. It assumes the standard IQ distribution and does not replace the specific norms, ceilings, or confidence intervals of any individual test.
If you want the narrative interpretation behind that percentile, open the retained IQ guide pages such as IQ 110, IQ 120, and IQ 130. If you need a static reference for common lookup searches, use the IQ Percentile Chart.
4 What Percentile Actually Means
A percentile rank tells you what percentage of the comparison group scored below a given result.
50th percentile means exactly average.
84th percentile means higher than about 84% of the comparison group.
98th percentile means only about 2% of the comparison group scored higher.
That is why percentiles are usually easier to understand than vague labels. If you are trying to answer the question "is this a good IQ?", percentiles make the answer much clearer.
5 Why You Should Use Percentiles Carefully
Percentiles only mean what the norms mean.
Age matters. Proper IQ interpretation compares you with same-age peers, not with everyone at once. See Average IQ by Age.
Battery breadth matters. A percentile from a broad multi-subtest battery means more than one from a very short quiz.
Small differences are not everything. An 84th percentile result and an 88th percentile result are not radically different in practice.
Context matters. A cognitive profile, not just one converted percentile, usually gives the best interpretation.
What percentile is IQ 100? IQ 100 is the 50th percentile on the standard IQ scale.
What percentile is IQ 130? IQ 130 is approximately the 97.7th percentile on the standard IQ scale.
Does percentile depend on age? On a properly normed test, yes. The score should already be interpreted relative to an age-appropriate comparison group.
7 Related Guides
Use these pages to move from simple percentile conversion to fuller interpretation:
The bands and percentiles on this page are ACIS conventions applied to a standard scale. The sources below document that scale, how professional reports present scores, and why norms age.
Voncken, L., Albers, C.J. & Timmerman, M.E. (2019). Improving confidence intervals for normed test scores. Behavior Research Methods. Open access. Documents the mean 100, SD 15 metric and the uncertainty that norming from samples adds to any score.
Crawford, J.R., Garthwaite, P.H. & Slick, D.J. (2009). On percentile norms in neuropsychology. The Clinical Neuropsychologist, 23(7), 1173-1195. Three definitions of a percentile coexist in practice and can return different results for the same score.
Pearson (2008). WAIS-IV Score Report sample. What a real report contains: every composite paired with a percentile rank, a 95% confidence interval and a qualitative description, never a bare number.
Pearson Clinical Assessment Scientific Council (2023). Standardized Clinical Assessment for Practitioners: A Primer. How standard scores, percentile ranks and the standard error of measurement are meant to be read together.
Pearson (2024). WAIS-5, Wechsler Adult Intelligence Scale, Fifth Edition. The current adult battery, covering ages 16:0 to 90:11 across five cognitive domains.
Riverside Insights. Stanford-Binet Intelligence Scales, Fifth Edition. A second current publisher with a different structure and a different age span, from 2 to 85 and above.
National Association for Gifted Children. What is Giftedness. The field's definitional body sets no fixed IQ threshold and holds that a single test at one point in time should not decide identification.
Lubinski, D. & Benbow, C.P. (2006). Study of Mathematically Precocious Youth after 35 years. Perspectives on Psychological Science. What long term follow up of verified high scorers actually shows.
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