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IQ Percentile Calculator

Convert an IQ score into an approximate percentile by using a mean of 100 and a selectable standard deviation of 15 or 16, with plain-language notes about the bell-curve model.

Enter the reported IQ score you want to compare with a norm group.

Most modern IQ scales use mean 100 and SD 15. Some older or alternate norms use SD 16.

This calculator gives a model-based percentile estimate. It does not replace the official percentile rank from a test report.

This calculator provides a general statistical estimate only and is not medical, psychological, educational, employment, or admissions advice. It does not diagnose any condition or determine ability, disability, giftedness, eligibility, placement, or accommodations. For personal interpretation or decisions, use the official report and consult a qualified psychologist or other appropriate professional.

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