IQ Score Converters

Academic admissions tests

Employment and military

Standard score formats

Cross-edition cognitive tests

How conversions work

All of these scales are normalised — they are designed so that a given score corresponds to a known position in a bell-curve distribution. The conversion between any two such scales is mathematically straightforward: convert to a common standard form (the Z-score), then convert from the Z-score to the target.

Z = (raw − mean) / SD
target = Z × SD_target + mean_target

What varies between converters is the mean and SD of the target scale. Test publishers report these in their score-report documentation. The converters here use the most commonly cited values.

Caveats that apply to all converters

• Equivalent ≠ identical. Two tests can sit at the same percentile rank yet measure subtly different things. An individual can plausibly score higher on one than the other.
• Tail-region estimates are noisy. Above the 98th percentile or below the 2nd, distributions diverge from the normal model and most tests have fewer calibration cases there.
• Sample matters. The GRE, ASVAB, and Wonderlic are normed on selected populations (graduate-bound, military-applicant, employment-applicant), not the general population. The "average" score on these tests is above the general-population mean of 100.
• Educational, not clinical. These converters are educational estimates, not clinical or admissions advice.