Free IQ Tools

Four fast, free, no-sign-up tools built on the same statistics that power professional IQ scoring: a normal distribution with mean 100 and standard deviation 15. Each tool runs instantly in your browser.

Which Tool Should You Use?

Start with the percentile calculator if you already have a score from any test and want to know what it means in population terms. It answers the most common question we get: is my number good? If you want the same answer in a form built for sharing, the rarity checker reframes your percentile as a 1-in-X figure with a crowd comparison, which lands better in a group chat than a percentile does. The test score converter is for people who never took an IQ test but have an SAT, ACT, or GRE score on record: published research maps those scores onto the IQ scale with useful accuracy, and the tool runs the conversion in both directions. The celebrity matcher is the fun one: it pulls from the same database of 300+ estimated celebrity scores that powers our famous IQ profiles, with the same disclaimer that estimates are not verified results.

A note on precision: professional IQ tests carry a standard error of about 3 points, and online estimates carry more. Treat every output here as a well-grounded approximation, and read our methodology page for exactly how each number is produced.

Why These Tools Exist

IQ statistics are often quoted but rarely shown. These tools make the underlying math explorable: how percentiles map to scores, how rarity explodes past 130, how standardized tests relate to measured ability, and how your score compares to publicly estimated celebrity figures. Every number is computed live from the normal distribution rather than from rounded lookup tables, and the conversion tools cite their research sources directly on the page. If you do not have a recent score to plug in, our free 30-question IQ test produces an instant estimate, and the IQ percentile chart and score ranges guide provide the reference background.