An IQ percentile tells you the percentage of people who scored lower than you on the same test. A percentile of 75 means you scored higher than 75% of the comparison group and lower than the top 25%. It ranks your performance relative to everyone else, rather than measuring an absolute amount of intelligence.
The takeaway: Your raw IQ number (like 115 or 130) and your percentile describe the same result two different ways. The number comes from a scale built around an average of 100; the percentile translates that number into "you scored higher than X% of people." To find the often-quoted "top X%," you simply subtract your percentile from 100 — the 90th percentile means the top 10%. The percentile is usually the more honest, more readable figure, because it tells you where you actually stand.
What is an IQ percentile?
A percentile is a ranking position. If you are at the 60th percentile, you scored higher than 60% of the people in the group your test compares you to, and lower than the remaining 40%. It is not a percentage of questions answered correctly, and it is not a grade. It is purely a statement about where your result falls in a crowd.
This matters because intelligence tests are designed to compare people, not to measure some fixed quantity in absolute units. There is no "100% of intelligence" you can fill up. Instead, test makers gather scores from a large, representative sample of people and use that distribution as the yardstick. Your percentile answers one specific question: out of everyone in that sample, what share did you outscore?
Percentile is not the same as "percent correct." You could answer 70% of the questions right and still land at the 95th percentile if the test was hard and most people scored lower. The percentile only cares about your position relative to others, never about how many items you got right.
What does "top X%" mean?
"Top X%" is just your percentile flipped around. Your percentile counts the people below you; "top X%" counts the people above you (plus you). The two always add up to 100. So the relationship is simple:
- Top X% = 100 − your percentile.
- If you are at the 90th percentile, you are in the top 10%.
- If you are at the 98th percentile, you are in the top 2%.
- If you are at the 50th percentile, you are in the top 50% — exactly average.
People love quoting the "top X%" version because it sounds more impressive and more exclusive. But it is the same fact as the percentile, written from the other direction. Whenever you see a headline figure like "top 5%," you can instantly translate it back: that is the 95th percentile. Neither phrasing is more "real" than the other — they are two views of one position on the curve.
How do percentiles relate to IQ scores?
IQ scores are built on what statisticians call a normal distribution — the familiar bell curve. On the standard scale, the average score is set to 100, and the spread is described by a standard deviation of 15 points. That means most people cluster near the middle, and scores get rarer the further you move toward either end.
Because the shape of the curve is fixed and known, every IQ number maps to a specific percentile. A score right at the average of 100 sits at the 50th percentile — half of people score higher, half lower. Each step of 15 points moves you a predictable distance up the curve. Here is how a few common scores translate:
| IQ score | Approximate percentile | Roughly the top… |
|---|---|---|
| 85 | 16th | top 84% |
| 100 | 50th | top 50% |
| 115 | 84th | top 16% |
| 130 | 98th | top 2% |
| 145 | 99.9th | top 0.1% |
Notice how the percentiles bunch up as the score climbs. The gap from 100 to 115 covers a huge slice of people (from the 50th to the 84th percentile), but the gap from 130 to 145 covers a much thinner sliver near the top. That is the bell curve at work: the extremes are crowded with fewer and fewer people, so each additional point of score there represents a rarer result. For a fuller breakdown of what these bands are called, see our guide to IQ score ranges.
The exact percentile for a given score depends slightly on which test and which sample you use, so different sources may say 130 is the 97.7th or 98th percentile. The differences are small. The point is the pattern: scores near 100 are common, and scores far from 100 are rare, in a way the bell curve predicts precisely.
Why does a percentile tell you more than a single number?
A raw IQ number on its own is hard to interpret unless you already know the scale. Tell someone they scored 122 and, without context, they cannot tell whether that is unusual or ordinary. Tell them they scored higher than 93% of people, and the meaning is immediate. The percentile carries its own interpretation built in.
Percentiles are also more honest about how scores actually distribute. Because the bell curve is steep in the middle, a few points of difference near the average can move your percentile a lot — going from 100 to 105 lifts you from the 50th to roughly the 63rd percentile. But the same five-point jump from 135 to 140 barely changes your percentile, because you are already out at the thin edge. The percentile reflects that reality; the raw number hides it.
This is also why a single number can be misleading on its own. Any test result carries some measurement error, so a careful test reports a range rather than a pinpoint figure. A percentile makes that easier to reason about: it reminds you that you occupy a region of the curve, not one exact dot. Two people with the "same" 120 might genuinely sit a percentile or two apart on a retest, and that is normal — not a sign that either result was wrong. The same logic explains why online IQ tests vary in accuracy depending on how carefully they are built and normed.
How do you read your percentile?
Reading a percentile is straightforward once you keep three things separate in your head:
- The percentile itself — the percentage of people you scored higher than. Higher is rarer.
- The "top X%" — just 100 minus your percentile, the share of people at or above you.
- The raw score — the number on the 100-average scale that produced both of the above.
When you take the free IQ test, your result shows your exact percentile alongside a plain-English "higher than X% of people" figure, so you do not have to do the math yourself. That phrasing is the percentile, stated directly. If the result also mentions a "top X%," remember it is the same fact subtracted from 100.
One honest caveat: any single estimate — online or in a clinic — is a snapshot, not a verdict. The comparison group matters too. A percentile only means something relative to the people the test was normed against, so always read it as "higher than X% of this sample," not as a universal truth about you. Treat your percentile as a useful, well-grounded estimate of where you stand, and you will read it correctly. If you want to see how your result compares against the middle of the curve, our explainer on the average IQ score is a good next stop.
A percentile is a clear way to understand a test result, but it is not a clinical diagnosis or a measure of your worth, your potential, or anything you cannot change. It describes one performance, on one test, against one group. Read it as information, not as a label.
What percentile is a 130 IQ?
A score of 130 sits at roughly the 98th percentile. That means you scored higher than about 98% of people, placing you in the top 2%. Because 130 is two standard deviations above the average of 100, it is genuinely uncommon — only about 1 in 50 people reach it. Exact figures vary slightly by test, but 97th–98th percentile is the standard answer.
Is the top 10% good?
Yes — the top 10% corresponds to the 90th percentile, which on the standard scale is an IQ of about 120. It means you scored higher than 90% of people. That is a strong, well-above-average result. Whether it is "good" for any particular goal depends on context, but statistically it places you clearly in the upper part of the curve.
What does the 95th percentile mean?
The 95th percentile means you scored higher than 95% of the comparison group, putting you in the top 5%. On the standard IQ scale, that is a score of about 125. Five percent of people scored as high as you or higher; ninety-five percent scored lower. As always, the percentile is the more readable way to express a result, and "top 5%" is simply 100 minus 95.