Live
Peptide Reconstitution / Dosage Calculator
Work out the concentration after reconstitution and how many units to draw on a U-100 insulin syringe for a prescribed dose.
IQ Percentile Calculator
Convert an IQ score to a percentile and classification, or find the IQ for a given percentile.
Did we solve your problem today?
How to use this calculator
Enter your values after choosing the type of calculation in the tabs. The result updates as you type; press Calculate to confirm and jump to the result on mobile. Use Share to send the calculator with your result.
How IQ maps to percentiles
Modern IQ tests are scaled so scores follow a normal distribution with mean 100 and standard deviation 15. The percentile is the share of the population scoring at or below your score.
z = (IQ − 100) ÷ SD
percentile = Φ(z) × 100
Example: IQ 115 is one SD above the mean, the 84th percentile. IQ 130 is about the 98th percentile.
Wechsler classification (WAIS-IV)
| IQ | Classification | Share of people |
|---|---|---|
| 130 + | Very superior | 2.2% |
| 120–129 | Superior | 6.7% |
| 110–119 | High average | 16.1% |
| 90–109 | Average | 50% |
| 80–89 | Low average | 16.1% |
| 70–79 | Borderline | 6.7% |
| 69 and below | Extremely low | 2.2% |
Different scales
Some older tests use SD 16 (Stanford-Binet before 2003) or SD 24 (Cattell). A Cattell 148 equals a Wechsler 130. Always compare scores on the same scale.
Frequently asked questions
What percentile is an IQ of 130?
About the 97.7th percentile on an SD-15 test.
What is an average IQ?
100 by definition; about half of people score between 90 and 109.
About this tool
- Written by
- [Author: to be assigned]
- Reviewed by
- Expert review pending
- Last updated
- 31 Oct 2026
See our methodology and editorial policy. Think something’s off? Report an error with this tool.
Related tools
All Health & FitnessLive
MAP (Mean Arterial Pressure) Calculator
Calculate mean arterial pressure (MAP) and pulse pressure from systolic and diastolic blood pressure.
Live
A1C Calculator
Convert hemoglobin A1C to estimated average glucose (eAG) in mg/dL or mmol/L, or back again, with ADA ranges.
Live
BAC / Alcohol Elimination Calculator
Estimate blood alcohol concentration (BAC) with the Widmark formula and how long until alcohol leaves your system.
Live
Pack-Year Calculator
Calculate smoking pack-years from cigarettes per day and years smoked, and check the USPSTF lung cancer screening criteria.
Planned
Child Height Percentile Calculator
Planned tool. People search for “height percentile calculator”.