IQ Percentile Calculator
Convert IQ scores to percentiles and population rankings using normal distribution with adjustable standard deviation.
IQ Scores and the Normal Distribution
Modern IQ tests report deviation scores with a mean of 100 and a standard deviation of 15 on Wechsler scales (16 on Stanford-Binet). Scores follow a bell curve, so most people cluster near average and extreme values are increasingly rare. This calculator converts an IQ score into a percentile and population ranking. For other percentile tools, see the Child BMI Percentile Calculator.
What Does Percentile Mean?
An IQ percentile tells you what percentage of the reference population scores at or below your result. A percentile of 75 means you scored higher than about 75% of people in the norm group. Percentiles depend on the test standard deviation you select.
Classification Ranges
Wechsler classification bands include Very Superior (130+), Superior (120-129), High Average (110-119), Average (90-109), Low Average (80-89), Borderline (70-79), and Extremely Low (69 and below). Always interpret IQ results with a qualified psychologist who administered a standardized test.
Frequently Asked Questions
What IQ score is average?
On most standardized tests, 100 is the population mean and represents the 50th percentile when the standard deviation is set correctly for that test.
What percentile is an IQ of 130?
With a standard deviation of 15, IQ 130 is approximately the 98th percentile, meaning about 2% of the population scores higher.
Should I use SD 15 or 16?
Use 15 for Wechsler Adult Intelligence Scale and Wechsler Intelligence Scale for Children. Use 16 for Stanford-Binet Fifth Edition and similar scales.
Can I use online IQ tests with this calculator?
Many online quizzes are not standardized. Percentiles are meaningful only when the IQ score comes from a validated, professionally administered test with known norm data.
What IQ is Mensa level?
Mensa typically requires scores at or above the 98th percentile, which corresponds to roughly IQ 130 on Wechsler scales with SD 15, though admission criteria vary by country and test type.
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