Your chronological age, that is, the number of years since the day of your birth, does not always align with what psychologists term your “mental age.” Determining the difference between the two is useful in designing lesson plans for the especially intelligent and mentally disabled, though the methods by which psychologists calculate mental age are limited. Standardized tests like the Stanford-Binet intelligence quotient have proven reliable, while doctor assessments in cases of severe disability are little more than educated guesses. Still, doctor assessments demonstrated reliability equal to that of testing in a 1986 study published in the "Journal of Pediatric Psychology."
Take an IQ test administered by a qualified, professional proctor. Online tests can be fun, but they lack expert analysis and come with warnings that they are for entertainment purposes only.
Write down your score in the following formula: IQ=MA/CA * 100, where “MA” is your mental age and “CA” is your chronological age. For example, if your chronological age is 10 and your IQ score is 120, the formula would read, 120=x/10 * 100, where “x” is your mental age.