IQ Score Analysis
95th percentile · Top 9% worldwide
What does an IQ of 128 mean?
An IQ score of 128 places you at the 95th percentile worldwide — ahead of roughly 95% of the population. This falls in the Superior range, a band occupied by approximately 9% of people. It reflects strong analytical capacity, efficient processing, and above-average facility with both quantitative and verbal reasoning.
A score of 128 is associated with the ability to master complex material relatively quickly, to identify non-obvious patterns, and to reason effectively under conditions of incomplete information. Individuals in this range tend to perform well in environments that reward structured thinking and independent problem-solving.
Population context
At 128, you are well above the cognitive threshold required for most professional and academic tracks. Research by psychologist Linda Gottfredson suggests scores above 120 correlate with the ability to handle the theoretical demands of most graduate-level disciplines without exceptional effort.
IQ classification scale
Frequently asked questions
Is an IQ of 128 good?
An IQ of 128 places you at the 95th percentile, in the Superior range (Top 9%). This is above average and reflects strong cognitive ability. Most professional and academic paths are well within reach.
What percentile is IQ 128?
An IQ of 128 corresponds to the 95th percentile. This means that 95% of the population scores at or below 128 under the same testing conditions. 5% of people score higher.
What does IQ 128 mean in terms of cognitive ability?
IQ 128 falls in the "Superior" classification (Top 9%). This reflects strong problem-solving skills, above-average processing speed, and the ability to master complex material efficiently.
Can IQ change from 128?
IQ scores are not fixed. Research shows that targeted cognitive training, quality sleep, aerobic exercise, and reduced chronic stress can measurably improve performance on IQ-type tasks. Dual N-Back training in particular has been shown to increase working memory and fluid reasoning scores. A well-designed 30-day cognitive training protocol can produce meaningful gains.
How rare is an IQ of 128?
About 5% of people score above 128, making it a relatively uncommon level of performance — you are in the top 5%.
Find out your score
What is your IQ?
40 questions · ~20 minutes · Instant results · Free
Take the free IQ test →