What does an IQ score of 133 mean?

An IQ score of 133 falls into the Gifted range on the standard intelligence scale (mean = 100, standard deviation = 15). This score is in the top 2–5% of the population — this is roughly the Mensa threshold range (IQ 130 on most scales).

Where does an IQ of 133 rank?

On a standardized IQ test, a score of 133 places you higher than approximately 98.6% of the population. Intelligence scores follow a normal distribution — most people cluster near 100, and scores taper off sharply toward both extremes.

Metric	Value
IQ score	133
Classification	Gifted
Percentile	98.6%
Rarity (out of 1,000)	~14 in 1,000 score this high or higher
Standard deviations from mean	2.20

Which IQ tests produce a score of 133?

A score of 133 can be produced by any standardized intelligence test that uses the mean = 100, SD = 15 scale. The most widely used tests include:

• Wechsler Adult Intelligence Scale (WAIS) — clinical gold standard for adults.
• Stanford-Binet Intelligence Scales — oldest continuously-used intelligence test.
• Mensa admissions test — used by the Mensa society for membership selection.
• Cattell-Horn-Carroll (CHC) tests — most theoretically grounded modern framework.
• Our free IQ test — instant online estimate with the same scaling.

How to interpret an IQ score of 133

Scores of 130 and above are in the gifted range, which is commonly the threshold for Mensa International membership (on tests with SD = 15). People at this level often excel at abstract reasoning, pattern detection, and rapid learning in new domains. Note that Mensa uses 132 on the Cattell scale (SD = 24), so the threshold depends on which test was taken.

IQ 133 in Context

IQ Range	Classification	Population %
Below 70	Extremely Low	~2.2%
70–79	Borderline	~6.7%
80–89	Low Average	~16.1%
90–109	Average	~50%
110–119	High Average	~16.1%
120–129	Superior	~6.7%
130+	Gifted / Very Superior	~2.2%

Factors That Influence Your Score

Your IQ score reflects a combination of genetic potential and environmental influences including education, nutrition, health, and the testing conditions themselves. Factors like fatigue, anxiety, unfamiliarity with the test format, and even the time of day can all affect performance. A single test score should be viewed as an estimate, and scores can vary by several points between testing sessions.

Nearby scores

Compare the major IQ tests

Which test produces the most accurate score depends on what you're trying to measure. These head-to-head comparisons break down the differences:

• WAIS vs Stanford-Binet — the two clinical heavyweights compared.
• Mensa vs WAIS — entry-test speed vs full clinical assessment.
• Stanford-Binet vs Mensa — which one actually gets you into Mensa.
• CHC vs Wechsler — modern cognitive framework vs the classic.
• Raven vs Cattell — non-verbal alternatives for cross-cultural testing.

Further reading

• What is a good IQ score?
• What does your IQ score mean?
• Average IQ by age
• Mensa requirements
• IQ test types compared

Frequently asked questions

Is IQ 133 considered good?

Yes — an IQ of 133 is well above average and falls in the gifted range. It's higher than approximately 99% of the population and typically exceeds the Mensa International admission threshold (130 on SD-15 tests).

Can an IQ of 133 change over time?

IQ scores are relatively stable in adulthood but can shift modestly with education, engagement, sleep, and health. Short-term factors like stress and fatigue can move a single test result by 5–10 points in either direction — which is why we recommend comparing results across multiple sessions rather than reading too much into any single score.

What percentile is IQ 133?

An IQ of 133 corresponds to the 98.6th percentile on the standard bell curve — meaning it is higher than about 99 out of every 100 people.