How do you calculate i q?

Answer 1

There are several schemes. Here is a fairly common one:

You do a timed test or a series of times tests. Because they are timed, they reward speed and not just intelligence.

You are awarded a score for correct answers, but no penalties for incorrect ones. This is your raw score which you will probably never see.

Your raw score is then standardised for your age using the distribution of scores achieved by others of your age. For each age, this distribution has a mean of 100 and a standard deviation of 15. This adjusted score is your IQ or intelligence quotient. This means that 95% of the population has an IQ of between 70 and 130.

While the standardisation process is designed to adjust for differences in age it is usually not designed to adjust for gender or cultural differences. As mentioned previously, it is more a measure of being able to do tests than intelligence - whatever that may be!

By the way, in case you think all this is sour grapes, I should tell you that I am a polyglot by upbringing and education, and a mathematician by profession, I am able to score extremely high at IQ tests - well above those whom I consider to be my intellectual peers.