Quick Answer: A "good" IQ score depends on context, but scores of 110 and above are considered above average, placing you in roughly the 75th percentile or higher. The average IQ is 100 (50th percentile), and the gifted threshold begins at 130 (98th percentile). However, IQ is just one measure of cognitive ability -- percentile rankings provide a far clearer picture of where you stand relative to the general population.

You took an IQ test. You received a number. Now what?

For most people, the raw score -- whether it is 95, 112, or 134 -- feels abstract. Is 112 good? Is 95 something to worry about? What does 134 actually mean in practical terms? The answer to all of these questions lies in understanding IQ percentiles: the statistical framework that transforms a raw number into a meaningful comparison against the rest of the population.

This guide will walk you through exactly how IQ scores are distributed, what the major classification systems say about different score ranges, and -- critically -- what your score does and does not tell you about your cognitive abilities.

"The important thing about any IQ score is not the number itself, but what that number means in comparison to a well-defined reference group."
-- Kaufman, A. S. (2009), IQ Testing 101

How IQ Scores Are Distributed: The Bell Curve

IQ scores follow a normal distribution (bell curve), a mathematical pattern where most values cluster around the center and fewer values appear at the extremes. For IQ:

  • Mean (average): 100
  • Standard deviation (SD): 15
  • Shape: Symmetrical -- the same percentage of people score above 100 as below it

This distribution is not accidental. IQ tests are deliberately designed to produce this pattern through a process called norming, in which test developers administer the test to thousands of people and then calibrate scoring so that the results fit the bell curve.

What the Standard Deviation Tells You

The standard deviation of 15 is the key to understanding every IQ score. Each SD away from the mean represents a specific percentile:

Distance from Mean IQ Score Percentile Proportion of Population
-3 SD 55 0.1st 1 in 1,000
-2 SD 70 2.3rd 1 in 44
-1 SD 85 15.9th 1 in 6
Mean 100 50th 1 in 2
+1 SD 115 84.1st 1 in 6
+2 SD 130 97.7th 1 in 44
+3 SD 145 99.9th 1 in 1,000

This means that an IQ of 115 -- which might feel only slightly above average -- actually places you ahead of 84 out of 100 people. Conversely, the jump from 130 to 145 represents a move from the top 2.3% to the top 0.1%, an enormous gap in rarity despite being "only" 15 points.

"People routinely underestimate how much a single standard deviation means. Moving from 100 to 115 puts you ahead of five out of six people in the room."
-- Gottfredson, L. S. (1997), Mainstream Science on Intelligence

IQ Score Ranges: Complete Classification Table

Different IQ test publishers use slightly different classification labels. The table below compares the three most widely referenced systems:

IQ Range Wechsler Classification Stanford-Binet Classification Percentile Range Rarity
145+ Very Superior Very Gifted or Highly Advanced 99.9th+ ~1 in 1,000
130-144 Very Superior Gifted or Very Advanced 97.7th-99.8th ~1 in 44
120-129 Superior Superior 90.9th-97.6th ~1 in 11
110-119 High Average High Average 74.2nd-90.8th ~1 in 4
90-109 Average Average 25.2nd-74.1st ~1 in 2
80-89 Low Average Low Average 9.2nd-25.1st ~1 in 4
70-79 Borderline Borderline Impaired or Delayed 2.3rd-9.1st ~1 in 11
Below 70 Extremely Low Impaired or Delayed Below 2.3rd ~1 in 44

What Do These Categories Mean in Practice?

  • Average (90-109): This is where the majority of the population falls. Individuals in this range can handle most educational and occupational demands comfortably. An IQ of 100 is exactly average -- not below average, not mediocre, but the literal center of the distribution.
  • High Average (110-119): Individuals in this range often excel in academic settings and tend to gravitate toward professional careers. A score of 115 places you ahead of approximately 84% of the population.
  • Superior (120-129): This range indicates strong cognitive abilities. Many successful professionals, graduate students, and skilled knowledge workers score in this range. A score of 125 places you in roughly the 95th percentile.
  • Very Superior / Gifted (130+): The traditional threshold for "giftedness." Only about 2-3% of the population scores here. This is the typical cutoff for Mensa membership and many gifted education programs.

What Is a "Good" IQ Score? It Depends on Context

The question "What is a good IQ score?" does not have a single answer because "good" depends entirely on what you are measuring against:

Context "Good" IQ Threshold Why
General population 100+ (above average) You outperform more than half the population
College admission (typical) 110+ Correlated with successful completion of a 4-year degree
Competitive graduate programs 120+ Many top MBA, law, and medical programs draw from this range
Gifted program eligibility 130+ Standard cutoff used by most school districts
Mensa membership 130+ (98th percentile) Requires scoring in the top 2% on an approved test
Profoundly gifted classification 145+ Extremely rare; specialized educational needs

"There is no magic number that separates the intelligent from the unintelligent. Intelligence is a continuum, and where we draw lines is always somewhat arbitrary."
-- Neisser, U., et al. (1996), Intelligence: Knowns and Unknowns (APA Task Force Report)

The "Good Enough" Threshold

Research by Gottfredson (2003) suggests that for most everyday tasks -- managing finances, understanding health information, following workplace instructions -- an IQ of approximately 90-100 is sufficient. Beyond an IQ of about 120, the relationship between IQ and real-world outcomes begins to show diminishing returns: factors like personality, motivation, social skills, and opportunity become increasingly important.

This is sometimes called the threshold hypothesis: IQ matters a great deal up to a certain point, after which other factors dominate.

Detailed IQ-to-Percentile Conversion Table

For precise interpretation, here is a point-by-point conversion for commonly referenced IQ scores:

IQ Score Percentile Meaning Approximate Rarity
70 2nd Scores higher than 2% of the population 1 in 44
75 5th Scores higher than 5% of the population 1 in 20
80 9th Scores higher than 9% of the population 1 in 11
85 16th Scores higher than 16% of the population 1 in 6
90 25th Scores higher than 25% of the population 1 in 4
95 37th Scores higher than 37% of the population ~1 in 3
100 50th Scores higher than 50% of the population 1 in 2
105 63rd Scores higher than 63% of the population ~2 in 3
110 75th Scores higher than 75% of the population 1 in 4
115 84th Scores higher than 84% of the population 1 in 6
120 91st Scores higher than 91% of the population 1 in 11
125 95th Scores higher than 95% of the population 1 in 20
130 98th Scores higher than 98% of the population 1 in 44
135 99th Scores higher than 99% of the population 1 in 100
140 99.6th Scores higher than 99.6% of the population 1 in 261
145 99.9th Scores higher than 99.9% of the population 1 in 1,000
150 99.96th Scores higher than 99.96% of the population 1 in 2,330
155 99.99th Scores higher than 99.99% of the population 1 in 10,000

Notice the asymmetry of rarity: the difference between the 50th and 84th percentile is just 15 IQ points (100 to 115), but reaching the 99.9th percentile from the 98th requires another 15 points (130 to 145). At the extremes, each additional point represents a dramatic increase in rarity.

IQ Scores by Profession: What the Research Shows

One of the most practical ways to contextualize your IQ score is to compare it against the cognitive demands of various occupations. The following data comes from large-scale studies, including those by the U.S. Department of Labor and meta-analyses by Schmidt and Hunter (1998):

Profession Estimated Average IQ Typical Range Percentile of Average
Physician / Surgeon 125-130 115-145 95th-98th
Attorney 120-128 110-140 91st-97th
Engineer 120-127 110-140 91st-96th
College Professor 118-125 108-140 88th-95th
Registered Nurse 110-115 100-130 75th-84th
Skilled Tradesperson 100-110 90-120 50th-75th
General Office Worker 100-105 85-115 50th-63rd
Retail / Service Worker 95-100 80-115 37th-50th

These are averages, not requirements. Plenty of successful physicians score below 125, and many people with IQs above 130 work in fields with lower average scores -- by choice or circumstance. The table illustrates the cognitive demands of different fields, not a person's worth or potential.

"IQ is a useful predictor, but it is not destiny. The correlation between IQ and job performance, while real, still leaves enormous room for individual variation."
-- Schmidt, F. L., & Hunter, J. E. (1998), The Validity and Utility of Selection Methods in Personnel Psychology

Common Misconceptions About IQ Scores and Percentiles

Misconception 1: "My IQ is fixed for life"

Reality: While IQ scores are relatively stable after adolescence (test-retest reliability of r = 0.90+), they are not immutable. A longitudinal study by Ramsden et al. (2011), published in Nature, found that adolescent IQ scores changed by as much as 20 points over a four-year period, with corresponding changes visible on brain imaging. In adults, factors like continued education, cognitive engagement, physical health, and even aerobic exercise can influence scores modestly.

Misconception 2: "A percentile is a percentage of intelligence"

Reality: Being in the 90th percentile does not mean you have "90% of maximum intelligence." It means you scored higher than 90% of the reference population. There is no theoretical maximum for intelligence, and percentiles are relative rankings, not absolute measurements.

Misconception 3: "Small score differences are meaningful"

Reality: The Standard Error of Measurement (SEM) for most IQ tests is approximately 3-5 points. This means a "true" IQ of 110 could produce measured scores anywhere from 105 to 115 across different testing sessions. A difference of 5 points between two people -- or between two tests taken by the same person -- is generally not statistically significant. Only differences of 10+ points are typically considered meaningful.

Score Difference Statistical Significance Practical Meaning
1-4 points Not significant Within measurement error; treat as equivalent
5-9 points Borderline May reflect real difference; interpret with caution
10-14 points Likely significant Meaningful cognitive difference in most domains
15+ points (1 SD) Highly significant Clear, observable difference in cognitive performance

Misconception 4: "Online tests are just as good as professional ones"

Reality: Professional IQ tests (WAIS-IV, Stanford-Binet 5) are normed on samples of 2,000-4,000+ individuals, administered one-on-one by trained psychologists, and have documented reliability and validity. Most online tests lack this rigor. However, a well-designed online assessment can provide a reasonable approximation -- useful for curiosity and self-awareness, though not for clinical or legal decisions.

"A test is only as good as its norms. Without a properly representative norming sample, an IQ score is essentially meaningless."
-- Kaufman, A. S. (2009), IQ Testing 101

How to Interpret Your IQ Score: A Step-by-Step Guide

If you have received an IQ score and want to understand what it means, follow these steps:

Step 1: Identify your percentile

Use the conversion table above to find your approximate percentile. This tells you what percentage of the population you outperformed.

Step 2: Consider the confidence interval

Your "true" IQ likely falls within a range of plus or minus 5 points from your measured score. A measured IQ of 118, for example, suggests a true IQ somewhere between approximately 113 and 123.

Step 3: Look at subtest scores (if available)

Composite IQ scores can mask significant variation across cognitive domains. A person with an overall IQ of 110 might have:

Domain Subtest Score Percentile Interpretation
Verbal Comprehension 125 95th Exceptional language ability
Perceptual Reasoning 115 84th Strong visual-spatial skills
Working Memory 98 45th Average short-term memory
Processing Speed 88 21st Below-average processing speed

This profile is far more informative than the composite score alone. It reveals specific strengths to leverage and areas where targeted improvement may help.

Step 4: Contextualize against your goals

An IQ of 105 is "average," but that label means very different things depending on whether you are:

  • Entering a skilled trade (where 105 is well within the typical range)
  • Applying to a competitive law school (where the average student scores 120+)
  • Assessing whether a learning difficulty explains academic struggles (where subtest patterns matter more than the composite)

Step 5: Remember the limitations

IQ does not measure motivation, creativity, emotional intelligence, work ethic, or character. These qualities often matter more for long-term success than cognitive ability alone.

If you want to assess your cognitive abilities, you can take our full IQ test for a comprehensive evaluation, try a quick IQ assessment for a faster result, or use a practice IQ test to familiarize yourself with the format.

The Flynn Effect: Why IQ Scores Keep Rising

One of the most striking findings in intelligence research is the Flynn Effect, named after New Zealand researcher James Flynn. Across industrialized nations, average IQ scores have risen approximately 3 points per decade throughout the 20th century (Flynn, 1987).

This means that someone scoring 100 on a test normed in 2020 would have scored approximately 110 on a test normed in 1990 -- not because they are smarter in any absolute sense, but because the reference population has shifted.

Proposed explanations for the Flynn Effect include:

  • Improved nutrition: Better childhood nutrition supports brain development
  • More years of education: Schooling trains the abstract reasoning skills that IQ tests measure
  • Environmental complexity: Modern life (technology, media, complex systems) provides more cognitive stimulation
  • Reduced infectious disease: Lower disease burden in early childhood frees cognitive resources for development
  • Smaller family sizes: More parental attention per child

The Flynn Effect has important implications for percentile interpretation. If you compare your score to old norms, you may overestimate your standing. Always check that your test uses current norms (within the last 10-15 years).

"The IQ gains of the twentieth century are massive -- so massive that they force us to reconceive the very meaning of intelligence test scores."
-- Flynn, J. R. (2007), What Is Intelligence?

Average IQ by Country: A Global Perspective

National average IQ scores are a contentious topic in psychology. While data from cross-national studies exist (Lynn & Vanhanen, 2002; Rindermann, 2018), they must be interpreted with extreme caution due to differences in test standardization, sampling methods, education systems, and socioeconomic conditions.

That said, the following patterns are broadly observed:

Region Estimated Average IQ Range Key Contributing Factors
East Asia (Japan, South Korea, China) 104-108 High investment in education, strong cultural emphasis on academic achievement
Western Europe, North America, Australia 97-102 Well-funded education systems, broad access to nutrition and healthcare
Eastern Europe 95-100 Improving education and health infrastructure
Latin America 85-95 Variable access to education and healthcare; improving trends
South Asia 82-90 Rapid improvements correlated with economic development
Sub-Saharan Africa 70-85 Strongly influenced by nutrition, disease burden, and educational access

These numbers reflect current environmental conditions, not fixed genetic potential. The Flynn Effect demonstrates that national averages can rise substantially within a single generation when conditions improve. Countries like Kenya and Brazil have shown IQ gains of 10-15 points over recent decades as nutrition, healthcare, and education have expanded.

Putting Your Score in Perspective: Real-World Context

What an IQ of 100 means

You are exactly average. This is not a negative -- it means you have the cognitive capacity to handle most everyday tasks, complete a high school education, hold a wide range of jobs, and navigate daily life effectively. Half the population scores below 100.

What an IQ of 115 means

You are in the top 16% of the population. You likely find academic work manageable and may excel in analytical roles. This is roughly the average score for college graduates in many studies.

What an IQ of 130 means

You are in the top 2%. You have the cognitive horsepower for the most demanding academic and professional work. This is the threshold for most gifted programs and Mensa eligibility.

What an IQ of 85 means

You are at the 16th percentile. Academic work may require more effort, but you can absolutely lead a successful, fulfilling life. Many people in this range thrive in hands-on, practical, or creative fields where IQ is less determinative.

Practical Tips for Using Your IQ Results

  1. Treat your score as a data point, not a label. It is one measurement taken on one day under one set of conditions.
  2. Pay attention to subtest patterns. A flat profile (all scores similar) is very different from a spiky one (big differences across domains), and the latter may reveal learning disabilities or specific gifts.
  3. Do not compare casually. Comparing IQ scores between people tested on different instruments, at different ages, or under different conditions is scientifically invalid.
  4. Use the percentile, not the raw number. Telling someone "you are in the 84th percentile" is more meaningful and less likely to be misinterpreted than saying "your IQ is 115."
  5. Retest if results seem inconsistent. If your score does not match your real-world functioning, consider retaking the test under better conditions (well-rested, not anxious, professionally administered).
  6. Focus on what you can control. Education, cognitive engagement, physical fitness, and sleep all have documented effects on cognitive performance.

To get started, you can take our full IQ test, try a timed IQ test that simulates real testing conditions, or use a practice IQ test to prepare.