IQ Score Guide / 128
Is 128 a Good IQ Score?
What an IQ of 128 means, where it ranks, and what it reveals about cognitive ability.
Where IQ 128 sits on the scale
An IQ of 128 is higher than 97% of people
In a room of 100 people, about 3 would score 128 or higher.
What an IQ of 128 means
An IQ of 128 is well above average, in roughly the top 3% of people. The Mensa cut-off is 130, so it is only 2 points below it. Scores at this level handle complex, analytical work comfortably.
How people who score 128 actually do
We looked at the 2,457 people who have scored exactly 128 on the IQScore test. On average, their strongest area was spatial reasoning and their weakest was logical reasoning. Here is the typical breakdown by section.
Real data from 2,457 IQScore test-takers. Section figures are the average percentage answered correctly in each area. Updated October 2026.
Frequently asked questions
Is 128 a good IQ score?
Yes. An IQ of 128 is clearly above average. It sits 2 points below the Mensa cut-off of 130, but in much the same territory. Demanding, analytical work tends to come comfortably.
What percentile is an IQ of 128?
An IQ of 128 is at about the 97th percentile. In plain terms, you score higher than around 97 out of every 100 people. The average score is 100.
What jobs suit an IQ of 128?
Most demanding careers are well within reach. Doctors, lawyers, researchers, engineers and senior leaders often score in this range. Keep in mind that people vary widely within any job, so the score is a rough guide, not a rule.
Can you improve an IQ of 128?
A little. Scores this high are strongly shaped by genetics, so big jumps are unlikely. Good sleep, regular exercise and a clear head on the day all help, but expect small gains rather than large ones.
Careers that commonly score in this range
Occupational averages from the National Longitudinal Survey of Youth. An average, not a requirement.
Famous people near IQ 128
Reported or estimated figures from third-party sources, none are clinically verified.
J.K. Rowling
Estimated around 129, 1 point above 128
Author of the Harry Potter series, University of Exeter graduate in French and Classics. Published assessments estimate her IQ at approximately 128–136, consistent with the internal consistency and narrative complexity of a seven-volume fictional universe.
Bill Clinton
Estimated around 125, 3 points below 128
42nd US President, Oxford Rhodes Scholar, and Yale Law School graduate, IQ estimates range from 120 to 137 across published sources. Independent analyses using his SAT score place him at approximately 120–130.
George W. Bush
Estimated around 125, 3 points below 128
43rd US President, Yale and Harvard Business School graduate. Analysis of his 1206 SAT score (1964 scale) using the Frey-Detterman correlation estimates his IQ at approximately 120–125.
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Further reading selected for this score range.
What Is a Good IQ Score? →
Where every score lands, and what counts as good, average, or gifted.
IQ Score Ranges Explained →
Every band from below average to genius, and what each one means.
IQ Score by Age →
How scores shift with age, and what stays fixed over a lifetime.
Fluid vs Crystallised Intelligence →
The two cognitive systems behind every IQ score.
Average IQ by Profession →
Where scores in this range cluster across careers.
How Much of IQ Is Genetic? →
What twin studies say about scores in the superior range.