Key takeaways: A score of 100 is the exact statistical middle of the IQ scale. Anything from 90 to 109 is considered average, 110 to 119 is high average, and scores above 130 are considered very rare — statistically, about 2 in 100 people. “Good” is relative to what you’re comparing it against, not a fixed line.
Why “Good” Depends on What You’re Comparing It To
People ask “what is a good IQ score” expecting a single number back, but the honest answer is that IQ scores don’t work like a school grade with a fixed passing line. They’re built entirely around comparison. When you take an IQ test, your raw number of correct answers gets converted into a score that reflects how you did relative to everyone else who has taken a comparable assessment — not relative to some absolute standard of “smart” or “not smart.”
This matters because a score that sounds unimpressive in isolation might actually be quite strong once you understand the scale it sits on, and a score that sounds impressive might be less rare than people assume. Before you can judge whether your number is “good,” you need to understand the scale itself.
The IQ Scale: Mean 100, Standard Deviation 15
Nearly every modern IQ test — including the widely used Wechsler Adult Intelligence Scale (WAIS) and most reputable online assessments — is built on the same underlying convention: a mean (average) score of 100, with a standard deviation of 15 points. If you’re not familiar with standard deviation, think of it as a unit of “distance from average.” One standard deviation above the mean (115) is a meaningfully strong result. Two standard deviations above the mean (130) is genuinely rare.
This scale exists because raw test scores are essentially meaningless on their own — a test with 30 questions and a test with 60 questions produce completely different raw numbers even if they measure the exact same ability. Converting every result onto this shared 100/15 scale is what lets you compare a score from one test to a score from a completely different one.
Full IQ Score Range Chart
| IQ Range | Classification | Approx. % of 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% |
| 130–144 | Very superior / gifted | ~2.1% |
| 145+ | Extremely gifted | ~0.1% |
A few things stand out when you actually look at this chart instead of guessing at it. First, half of the entire population falls into the 90–109 “average” band — which means an “average” score is, definitionally, the most common outcome, not a disappointing one. Second, the tails of the distribution get thin very fast: moving from “high average” (110–119) into “superior” (120–129) already puts you ahead of roughly 91% of people, and crossing into the 130+ range puts you in the top 2%.
So What Counts as “Good”?
If we’re being precise about it, anything above 100 puts you above the statistical midpoint, which is a reasonable working definition of “good” in the most literal sense. But in everyday usage, most people mean something closer to “clearly above average,” which is generally where the 110+ range comes in — you’re not just edging past the midpoint, you’re solidly ahead of the majority of test-takers.
That said, it’s worth being honest about how small the practical difference is between adjacent scores in the middle of the distribution. The difference between a 102 and a 108 is mostly noise — normal day-to-day variation in focus, sleep, and familiarity with test-style questions. The differences that actually mean something tend to show up further from the center, where each additional 5–10 points represents a genuinely smaller slice of the population.
Average Isn’t a Bad Result
It’s worth pushing back directly on the framing that an average score is somehow a letdown. A score of 100 means you performed exactly as well as the statistical center of the distribution — which, again, is where half of all people land. There’s no meaningful sense in which “half the population” is an underperforming group. Average is average precisely because it’s the most common, most typical outcome, and typical cognitive ability is more than sufficient for the overwhelming majority of everyday tasks, careers, and problem-solving situations people encounter.
Where this framing goes wrong most often is when people compare their score to a friend’s higher number and treat the gap as more meaningful than it statistically is, without accounting for the fact that a single test administered on a single day captures a snapshot, not a permanent, unchanging measurement.
Why Your Score Might Shift Between Tests
If you’ve taken more than one IQ test and gotten two different numbers, that’s normal, not a sign that either test is broken. A few real factors drive this:
Test format differences. A test weighted heavily toward spatial reasoning will produce a different result for the same person than one weighted toward verbal or numerical reasoning, because most people aren’t equally strong across every category.
Practice effects. If you’ve seen similar puzzle types recently, you’ll perform measurably better the second time, independent of any change in your actual reasoning ability — this is one reason clinical psychologists space out repeat administrations of the same instrument.
State on test day. Sleep, stress, and time pressure all affect performance on any cognitive task, IQ tests included. A rushed test taken late at night after a long day will generally underestimate your typical performance.
Sample size and calibration. An online test calibrated against a smaller or different reference population will produce scores that don’t map perfectly onto a clinically administered test’s scale, even if both use the same 100/15 convention.
None of this means online tests are worthless — it means you should read your score as a solid estimate within a reasonable range, not a permanent, exact measurement down to the single point.
What a Good Score Actually Predicts (and What It Doesn’t)
Research does show a real, if moderate, correlation between IQ scores and outcomes like academic performance and certain job-training success rates. But it’s a much weaker predictor of the things people often assume it predicts strongly — things like creativity, emotional intelligence, practical judgment, financial success, or general life satisfaction. A high score reflects strong performance on the specific kinds of reasoning tasks the test measures (pattern recognition, working memory, logical deduction), which is genuinely useful information about your cognitive strengths, but it isn’t a complete measure of intelligence in the broader, everyday sense of the word.
Getting Your Own Score in Context
Reading a range chart is useful, but it’s more useful once you have an actual number to place on it. If you haven’t taken the free IQ test, it takes about 25 minutes and reports your composite score alongside a percentile rank and a breakdown across four separate reasoning categories — spatial, numerical, logical, and applied — so you can see not just where your overall score lands on this chart, but which specific type of reasoning is driving it.
If you want to go one level deeper into how percentiles are calculated from a raw score, the IQ percentile explained guide walks through the math in plain terms. And if your number came out on the high end, the genius IQ article covers exactly where that threshold sits and how rare it actually is.
Frequently Asked Questions
Is 100 a good IQ score? Yes — 100 is exactly the statistical average, which places you ahead of roughly half of all test-takers. It’s not a low or disappointing result; it’s the most statistically common outcome.
What IQ is considered high? Most classification systems consider 120 and above “superior,” and 130+ (roughly the top 2%) is generally the threshold associated with terms like “very superior” or “gifted.”
Can your IQ score change over time? Your underlying cognitive ability is relatively stable in adulthood, but your measured score on any single test can vary by several points due to test format, familiarity with question types, and your state on test day. Large, consistent shifts over years are less common than day-to-day test variation.
Does a low score on one test mean I have low intelligence? No. A single test result reflects performance on a specific set of question types, on a specific day. It’s one data point, not a complete or permanent measure of your cognitive ability.
What’s considered a bad IQ score? There isn’t really a “bad” score in a practical sense — scores below 90 simply indicate performance below the statistical average on this specific type of assessment, and the vast majority of people in that range function entirely normally in everyday life, education, and work.