does anybody know the IQ equation?

What do you mean by “equation”? When IQ tests were given only to small children, they would use the equation mental age/ chronological age x 100. That’s not accurate for adults, though, and isn’t used for IQ testing so much anymore even for children. http://www.iqcomparisonsite.com/IQBasics.aspx

If you want something that will convert one type of IQ test or other test grade to another: http://www.davidpbrown.co.uk/psychology/iq-conversion.html .