Convert IQ Score to Percentile
Use a score between 40 and 180. The formula is based on the cumulative normal distribution:
percentile = Phi((IQ - 100) / 15) * 100
Important Caveats
- This is an educational conversion tool, not a diagnosis or professional assessment.
- Percentiles are theoretical estimates from the standard normal model, not population norms from a supervised clinical sample.
- Extreme-tail estimates above about IQ 145 are less stable because real tests have fewer calibration cases there.
- No score entered here is stored, submitted, or connected to an account.
Related References
For the full lookup table and score-band context, see the IQ percentile chart and IQ score chart. To understand how What's Your IQ reports results, read the methodology page.