The Wonderlic is a 50 question test. Although most people find many of the questions easy, you only get 12 minutes which makes getting a perfect 50/50 almost impossible.

To my surprise, the Wonderlic correlated 0.9+ with the big kahuna of IQ tests, the WAIS, in a general population sample, which is really quite incredible for such a short test. In fact it seems too high to be true (maybe it’s an outlier; another study found a much lower correlation among the mentally ill, though the old WAIS was especially good at penalizing the kind of mental illness we find in my comment section ).

I recently cited data from page 6 of this article from no later than the 1970s, suggesting white Americans average 23.32 (SD = 7.5) on the Wonderlic Personnel Test (WPT).

However I worried that the average today might be much higher because of the Flynn effect.

However a 2006 study of production worker applicants found the white mean to be 21.81 (SD = 6.0). This convinced me that scores have not been going up on the Wonderlic in the general population (maybe they’re making the test harder to negate any Flynn effect?). I don’t think they’ve been going down either, but white production workers might be less intelligent than the general white population.

Thus I endorse the following formula for converting Wonderlic scores into IQ (U.S. white norms):

IQ (U.S. white norms) = [(wonderlic score – 23.32)/7.5][15] + 100

For those who prefer general U.S. norms I endorse the following formula:

IQ (U.S. norms) = [(wonderlic score – 21.75)/7.6][15] + 100

The second formula is based on a recent academic paper which states:

The average for working adults in the United States is 21.75, with a standard deviation of 7.6 (Wonderlic, 2000)

Some research suggests WPT scores should be adjusted for age in the following way before converting to IQ:

age 16 to 29: Add 0 points to your raw WPT score