Work out iq score estimate instantly with clear inputs, formula shown and shareable results.
The raw score is standardised into a z-score, then mapped onto the IQ scale which is defined as mean 100 and standard deviation 15. IQ is a rank within a norm group rather than an absolute measure, so the figure is only meaningful if the mean and standard deviation come from a properly normed sample.
Z-score
z = (raw score - norm mean) / norm standard deviation
IQ scale
IQ = 100 + 15 x z
This converts a raw score onto the IQ scale using norms you supply. It is not a validated intelligence test.
z = (raw score - norm mean) / norm standard deviation. The raw score is standardised into a z-score, then mapped onto the IQ scale which is defined as mean 100 and standard deviation 15.
IQ is a rank within a norm group rather than an absolute measure, so the figure is only meaningful if the mean and standard deviation come from a properly normed sample.
Enter your raw score, mean raw score for the norm group, standard deviation of raw scores. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.