IQ Percentile Calculator: See What Your Score Means

Enter an IQ score to see the percentile it corresponds to, how rare it is, and its classification — calculated on the normal distribution (mean 100).

How this calculator works

IQ scores follow a normal distribution with a mean of 100. Most modern tests use a standard deviation of 15, so the calculator converts your score to a z-score (how many standard deviations from the mean) and reads the percentile from the normal curve. An IQ of 115 is one standard deviation above the mean — the 84th percentile — while 130 is two standard deviations up, the 98th percentile and the usual Mensa cutoff.

Some tests report on different scales: the Cattell scale uses a standard deviation of 24, which is why a "Cattell 148" equals a "Wechsler 130." Use the scale selector to convert. For the full background, see our guides to IQ percentiles, the IQ scale and the IQ score chart.

Don't know your IQ?

Take the IQ Revealed 40-question assessment — matrix-reasoning questions, about 15 minutes — and get your score, percentile and a five-ability cognitive profile.