Is 100 a Good IQ Score?

What an IQ of 100 means, where it ranks, and what it tells you about cognitive ability.

100

IQ Score

50th

Percentile

Average

Classification

1 in 2

Rarity

What an IQ of 100 means

An IQ of 100 sits at the 50th percentile. 50% of people score at or below 100. IQ 100 is the population average by design. Research is consistent that in this range, effort and opportunity have a stronger influence on outcomes than raw cognitive ability, which is fully adequate for the vast majority of roles and situations.

IQ 100 in context

IQ 100 is the population mean by design — the anchor point of the standard scale. Exactly half the population scores at or below this point, and half above. The symmetry is intentional: every IQ test is periodically renormed to keep the mean at 100 as population performance shifts over time. In the upper half of the Average range, the research consensus is clear: the 0-point advantage over the population midpoint has limited independent predictive power for outcomes. Conscientiousness, accumulated domain expertise, and opportunity account for more variance at IQ 100 than the cognitive score itself. This does not diminish the score — it contextualises it. Most professional and academic paths are fully accessible at this level, and the ceiling is rarely cognitive.

Frequently asked questions

Is 100 a good IQ score?

It is the population average — that is what IQ 100 is designed to represent. Exactly 50% of people score at or below 100. Most professional and academic paths are fully accessible here. Research is consistent that personality and work ethic are stronger predictors of outcomes than raw IQ in this range.

What percentile is an IQ of 100?

The 50th percentile. That means 50% of the population scores at or below 100. IQ 100 is set as the population median by design. 50% of people score above 100. The population mean is 100 with a standard deviation of 15.

What careers are associated with an IQ of 100?

Most skilled occupations are within reach at IQ 100. Research shows that in the average range, traits like conscientiousness and work ethic — not raw IQ — are the primary drivers of career outcomes. Most practical and commercial careers cluster near this band.

Can you improve an IQ of 100?

Yes. IQ scores respond to environmental changes, particularly before age 25. Sleep quality has the single largest short-term effect on fluid intelligence. Nutrition, stress reduction, and working memory training also have evidence behind them. Gains of 5–10 points are realistic with sustained effort.

Careers that commonly score in this range

Sales RepresentativeMost commercial sales roles fall within 90–110

Clerical / AdministrativeOffice support and coordination roles cluster here

Skilled TradespersonElectricians, plumbers, mechanics — practical intelligence emphasis

Retail ManagerStore and department management typical range

Notable people reportedly in this range

All figures are estimates or reported by third-party sources — none are clinically verified.

George Washington

First US President and commanding general of the Continental Army — historians estimate Washington's IQ at approximately 95–105 based on his extensive surviving correspondence and military and administrative decisions.

Thomas Edison

Inventor of the light bulb, phonograph, and motion picture camera — Edison's IQ is estimated at approximately 95–110 by historians. He left school at 12 and famously said genius is 1% inspiration and 99% perspiration.

From the IQScore blog

Further reading selected for this score range.

Can You Improve Your IQ? →

Honest breakdown of what actually moves the needle.

What Sleep Deprivation Does to Your IQ →

The fastest way to suppress cognitive performance, and how to reverse it.

Nutrition and Brain Performance →

Which dietary factors have the clearest evidence behind them.

Working Memory and Intelligence →

The most directly trainable component of measured IQ.