What does an IQ of 145 mean?
An IQ of 145 is three standard deviations above the average, an extremely rare result reached by roughly 1 in 740 people.
At 145 you are in about the top 0.1% of the distribution. This is near the upper limit of what most standardised tests can reliably measure, because so few people score there that the scale becomes less precise.
Scores this high are where the difference between test instruments matters most. The same person can get noticeably different numbers on different tests, so a single 145 is best read as "extremely high" rather than an exact figure.
What an IQ of 145 does not tell you
Free online tests are not calibrated for the extreme tail and tend to overstate very high scores. Treat a 145 from any quick test as an estimate, and remember that beyond a certain point, higher reasoning scores stop predicting better life outcomes.
Common questions
How rare is an IQ of 145?
About 1 in 740 people score 145 or above (roughly the top 0.1%).
Is an IQ of 145 accurate from an online test?
Treat it as an estimate. Standardised tests lose precision at the extreme tail, and free online tests in particular tend to run high.
Other IQ scores
Testrize provides a free, educational estimate of cognitive skills. It is not a clinical or diagnostic IQ test, and online scores should not be used for official purposes.