IQ Percentile Calculator
A percentile tells you what share of people score below you. On modern tests, an IQ of 100 is the 50th percentile, 115 is the 84th, 130 is the 98th and 145 is the 99.9th. Enter any score to convert it, or switch modes to find the IQ for a percentile.
84th percentile
High average · 1 in 6 score higher · 115 on the standard scale
In a room of 100 people, someone with an IQ of 115 would be smarter than 84 of them.
- Outscored: 84
- Would score higher: 16
Percentiles compare you with the general population, not with other test-takers on this site. Don’t know your score? Take the free IQ test.
IQ to percentile chart
Every five points from 70 to 160 on the standard scale (mean 100, SD 15). Select a score for its full breakdown.
| IQ | Percentile | Score higher | Classification |
|---|---|---|---|
| 70 | 2nd | Over half | Below average |
| 75 | 5th | Over half | Below average |
| 80 | 9th | Over half | Low average |
| 85 | 16th | Over half | Low average |
| 90 | 25th | Over half | Average |
| 95 | 37th | Over half | Average |
| 100 | 50th | 1 in 2 | Average |
| 105 | 63rd | 1 in 3 | Average |
| 110 | 75th | 1 in 4 | High average |
| 115 | 84th | 1 in 6 | High average |
| 120 | 91st | 1 in 11 | Superior |
| 125 | 95th | 1 in 21 | Superior |
| 130 | 98th | 1 in 44 | Very superior |
| 135 | 99.0th | 1 in 102 | Very superior |
| 140 | 99.6th | 1 in 261 | Very superior |
| 145 | 99.9th | 1 in 741 | Very superior |
| 150 | 99.96th | 1 in 2,330 | Very superior |
| 155 | 99.99th | 1 in 8,140 | Very superior |
| 160 | 99.99th | 1 in 31,600 | Very superior |
Percentile to IQ on every common scale
Tests spread scores differently. The Wechsler scales and the Stanford-Binet 5 use a standard deviation of 15, older Stanford-Binet editions used 16, and the Cattell Culture Fair test uses 24, so the same rank produces three different numbers.
| Percentile | SD 15 | SD 16 | SD 24 | What it means |
|---|---|---|---|---|
| 50th | 100 | 100 | 100 | Exactly average |
| 75th | 110 | 111 | 116 | Top quarter |
| 84th | 115 | 116 | 124 | One standard deviation above average |
| 90th | 119 | 121 | 131 | Top 10% |
| 95th | 125 | 126 | 139 | Top 5%, a cut-off some gifted programs use |
| 97.7th | 130 | 132 | 148 | Two standard deviations: Mensa’s usual qualifying level (“top 2%”) |
| 99th | 135 | 137 | 156 | Top 1% |
| 99.9th | 146 | 149 | 174 | Top 0.1%, the Triple Nine Society’s level |
That is why a Cattell score of 148 and a Wechsler score of 130 describe the same rank. Before you compare two results, check which scale each test used.
How IQ percentiles are calculated
IQ scores follow a bell curve with a mean of 100. To turn a score into a percentile, measure how far it sits from the mean in standard deviations (the z-score), then read off the share of the curve below that point.
- Find the z-score: (IQ − 100) ÷ 15. For an IQ of 120: (120 − 100) ÷ 15 = 1.33.
- Look up the normal curve: 0.9088 of the curve lies below z = 1.33.
- Convert to a percentile: 90.9%, so an IQ of 120 is the 91st percentile.
The calculator does the same for any score, and for other scales it swaps 15 for that test’s standard deviation. Going the other way, from a percentile to a score, runs the steps in reverse.
A percentile is not a percentage correct
Scoring at the 84th percentile means you did better than 84 out of every 100 people, not that you answered 84% of the questions. Good IQ tests include questions almost nobody can solve, so a high percentile often comes with plenty of wrong answers. On MyIQTest, harder questions also count for more, which the methodology explains.
What percentile do you need for Mensa or a gifted program?
Mensa accepts people who score in the top 2% on an approved, supervised test. That is usually 130 on the Wechsler scales, 132 on an SD 16 test and 148 on the Cattell. Many US school gifted programs use a similar line around 130, though some districts set it at the 95th percentile or combine several measures.
Higher-bar societies go further: the Triple Nine Society asks for the 99.9th percentile. See how these compare with the highest IQ scores ever recorded.
IQ percentile questions
What percentile is an IQ of 120?
An IQ of 120 is at the 91st percentile on the standard scale: higher than about 91% of people. Roughly 1 in 11 people score higher.
What IQ is the 90th percentile?
About 119 on a test with a standard deviation of 15, 121 on an SD 16 test and 131 on the Cattell scale (SD 24).
What IQ is the 99th percentile?
About 135 on the standard scale (SD 15). One person in 100 scores at or above it.
Is the 75th percentile a good IQ?
Yes. The 75th percentile is an IQ of about 110, the start of the high average range. You would score higher than three people in every four.
Why can’t a percentile be 100?
A percentile is the share of people who score below you, and nobody scores below themselves at the very top. Even a record score is the 99.99th-something percentile, which is why calculators cap the number instead of showing 100.
Do IQ percentiles depend on age?
Your IQ is already compared with people your own age: professional IQ tests have separate norms for each age band, so the same percentile means the same rank among your peers at 10 or at 60.
Find your own percentile
Take the free 30-question IQ test for your score, percentile and a reasoning breakdown. Instant result, no email.
Take the free IQ testBy the MyIQTest team · Reviewed November 2026 · See the full IQ scale and score chart