Free IQ Calculators & Tools

Enter an IQ score to instantly see its percentile, rarity, and how many people it beats. Switch the standard deviation or convert in either direction between score and percentile.

Type any IQ score to see exactly what it means: its classification, percentile, and how rare it is. A fast, plain-English lookup for any number on the scale.

Enter both parents' IQ scores to estimate a child's most likely range. The estimate accounts for regression to the mean, the natural pull of children's scores back toward 100.

Convert an IQ score between the SD-15, SD-16, and SD-24 scales, as well as z-scores and T-scores. Pick a source and target scale to see the equivalent score instantly.

Enter your IQ and pick your country to see how you compare to its average and your national percentile. Find out instantly whether you score above, at, or below the local norm.

Enter your age to see how age-normed IQ works and why your score is always measured against your own age group. The tool shows that the average lands at 100 no matter your age.