— Reference Table
IQ Percentile Chart (2026)
The complete IQ score-to-percentile chart, derived from the standard normal distribution with mean 100 and standard deviation 15 — the convention used by the Wechsler scales (WAIS-IV, WISC-V) and most modern psychometric tests.
| IQ Score | Percentile | Rarity | SD from mean | Band |
|---|---|---|---|---|
| 55 | 0.1% | 1 in 740 | −3.0 | Extremely Low |
| 60 | 0.4% | 1 in 260 | −2.67 | Extremely Low |
| 65 | 1% | 1 in 100 | −2.33 | Very Low |
| 70 | 2.3% | 1 in 44 | −2.0 | Very Low |
| 75 | 5% | 1 in 21 | −1.67 | Borderline |
| 80 | 9% | 1 in 11 | −1.33 | Low Average |
| 85 | 16% | 1 in 6.3 | −1.0 | Low Average |
| 90 | 25% | 1 in 4 | −0.67 | Average |
| 95 | 37% | 1 in 2.7 | −0.33 | Average |
| 100 | 50% | 1 in 2 | 0.0 | Average |
| 105 | 63% | 1 in 2.7 | +0.33 | Average |
| 110 | 75% | 1 in 4 | +0.67 | High Average |
| 115 | 84% | 1 in 6.3 | +1.0 | High Average |
| 120 | 91% | 1 in 11 | +1.33 | Superior |
| 125 | 95% | 1 in 21 | +1.67 | Superior |
| 130 | 97.7% | 1 in 44 | +2.0 | Highly Gifted |
| 135 | 99% | 1 in 100 | +2.33 | Highly Gifted |
| 140 | 99.6% | 1 in 260 | +2.67 | Genius |
| 145 | 99.87% | 1 in 750 | +3.0 | Profoundly Gifted |
| 150 | 99.96% | 1 in 2,300 | +3.33 | Profoundly Gifted |
| 155 | 99.99% | 1 in 11,000 | +3.67 | Profoundly Gifted |
| 160 | 99.997% | 1 in 31,500 | +4.0 | Profoundly Gifted |
How to read this chart
Each row tells you four things about a given IQ score:
- Percentile — the fraction of the population that scores at or below this number
- Rarity — how many people you'd need to sample (on average) to find one at this level or higher (above 100) or lower (below 100)
- SD from mean — how many standard deviations away from the population average of 100
- Band — the classification label assigned by most clinical and educational frameworks
Why the bands cluster around the mean
The IQ scale follows a normal distribution, which means most people cluster near 100. About 68% of the population scores between 85 and 115 (one SD either side of the mean). Another 27% scores between 70–85 or 115–130. Only 5% fall outside the 70–130 range entirely.
This is why the rarity column accelerates so fast at the extremes — every additional 15 points (one full SD) cuts the population in roughly half on the average side, and by much more on the tail sides.
Wechsler vs Stanford-Binet
This chart uses the Wechsler convention (SD = 15), used by most modern tests including the WAIS-IV, WISC-V, RIAS-2, and Core Brain. Stanford-Binet uses SD = 16, which shifts the equivalent scores slightly:
- Mensa cutoff: 130 (Wechsler) ≈ 132 (Stanford-Binet)
- Three SD: 145 (Wechsler) ≈ 148 (Stanford-Binet)
Take a real IQ test
Core Brain runs a 3PL Bayesian IRT estimator with items calibrated against the Wechsler distribution. Twenty minutes, six cognitive axes, a normed IQ score with a 95% confidence interval — so you can see exactly where your score sits on the chart above.
Take the Core Brain IQ test →