IQ percentile calculator
IQ scores are built so that most people sit near 100. This calculator shows where a score falls on that curve: the share of people below it, how rare it is, and how much a few points of measurement error change the picture.
The measurement error (standard error of measurement) is given in each test's manual; 3 points is a round order of magnitude for the full score of the major tests, and short or online tests are less precise. Put 0 to hide the interval.
Common scores on this scale
Computed from the normal curve. Real tests are built on samples of a few thousand people, so the far ends of the curve are less certain than the arithmetic suggests. The labels are descriptive landmarks close to those of recent Wechsler scales, not diagnoses.
Frequently asked questions
What percentile is an IQ of 130?
On a scale with a standard deviation of 15 (Wechsler and most current tests), 130 is two standard deviations above the mean: about the 97.7th percentile, roughly 1 person in 44 at or above it. On a scale with a standard deviation of 24, the same 130 is far more common: about the 89th percentile.
Why do some sites announce IQs of 160 or more?
Two reasons. Some use a scale with a standard deviation of 24, which inflates the number: 160 on that scale equals about 138 on the usual scale. And beyond about 145, very few people in the norm samples score that high, so such scores are very uncertain.
Is an IQ below 70 a diagnosis of intellectual disability?
No. A diagnosis also requires lasting difficulties in everyday adaptive functioning that began during development, assessed by a professional. A single score is never enough, and an online score even less.
Can I trust an online IQ test?
It gives an estimate at best. A real IQ assessment is done by a psychologist with a standardised test (such as the WAIS or WISC), in controlled conditions, and reports an interval rather than a single number. Our own IQ tests are presented as estimates for that reason.
Is anything saved or sent?
No. Every calculation is done in your browser and nothing you type leaves your device.