Formula to calculate intelligence quotient (IQ):
C i.e. Mental age/Chronological Age * 100Ref: Parks Textbook of Preventive and Social Medicine, 24th editionExplanation:IQ = Mental Age / Chronological Age * 100 Distribution of intelligence in normal populationClassification of TypesI.Q. (Inteligence Quotient)1. Near genius or genius140 and above2. Very superior130-1393. Superior120-1294. Above average110-1195. Normal or average90-1096. Below average80-897. Dull or borderline70-798. Feebleminded, moron50-699. Imbecile25-4910. Idiot0-24
Chronological age/Mental age * 100
Mental age - Chronological Age * 100
Mental age/Chronological age * 100
Mental age + Chronological Age * 100
Growth, Development, and Behavior