IQ | Intelligence Testing, Cognitive Ability & Mental Age (2024)

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Also known as: intelligence quotient

IQ, (from “intelligence quotient”), a number used to express the relative intelligence of a person. It is one of many intelligence tests.

IQ was originally computed by taking the ratio of mental age to chronological (physical) age and multiplying by 100. Thus, if a 10-year-old child had a mental age of 12 (that is, performed on the test at the level of an average 12-year-old), the child was assigned an IQ of 12/10 × 100, or 120. If the 10-year-old had a mental age of 8, the child’s IQ would be 8/10 × 100, or 80. Based on this calculation, a score of 100—where the mental age equals the chronological age—would be average. Few tests continue to involve the computation of mental ages. See also Lewis Terman; Alfred Binet.

IQ | Intelligence Testing, Cognitive Ability & Mental Age (2)

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This article was most recently revised and updated by Jeannette L. Nolen.

IQ | Intelligence Testing, Cognitive Ability & Mental Age (2024)

FAQs

How do you calculate IQ with age and mental age? ›

Using a person's mental age and chronological age, Binet was able to calculate IQ by taking a person's mental age, dividing it by their chronological age, and multiplying that new number by 100. Generally, a score of 100 is considered average in an IQ score range.

Is there a free IQ test with free results? ›

One of the most well-known online exams available to you is Free-IQTest.net. It has 20 questions that will measure your IQ score accurately. After this test, you have to give your birth date since the test calculates your IQ score based on your age. This way, you may compare yourself to your peers.

What is an IQ of 70 equivalent to? ›

Historical IQ classification tables
IQ Range ("ratio IQ")IQ Classification
110–119High average
90–109Normal or average
80–89Low average
70–79Borderline defective
3 more rows

What will be the IQ of a child if his mental age is 5 years and chronological age is 4 years? ›

Hence, we conclude that if a student's chronological age is 4 years and the mental age is 5 years, his I.Q. will be 125.

What is the IQ of a normal man? ›

IQ scores between 90 and 109 indicate a normal IQ range or average intelligence. Individual adults usually score somewhere between the 70-130 range, with 100 being the theoretical average.

What was Albert Einstein's IQ? ›

Most theorists peg Einstein's IQ score between 160-190. Because he never took any kind of test to measure his intelligence, the definite score is still a mystery. But without a doubt, he was a brilliant man with an incredible brain.

What is Elon Musk's IQ? ›

Elon Musk's IQ puts him in the Highly Gifted category. IQ tests provide insight into an individual's cognitive ability. As mentioned earlier, Elon Musk's IQ score is believed to be between 155 and 160. Above-average IQ scores within this range are only reserved for the "Highly Gifted" IQ classification.

What is the average IQ of a woman? ›

On average, women had an IQ of 100.7 compared to men at 100.

What IQ is considered genius? ›

While there is some debate among psychologists, a widely accepted threshold for genius IQ scores is 130 or above. This score places an individual in the top 2% of the population, making them exceptionally intelligent.

What is the strongest predictor of a child's IQ? ›

Empirical evidence suggests that especially parental education, parental income, and maternal IQ are important predictors of intelligence.

Can average IQ parents have a high IQ child? ›

Yes, it's not impossible… but it's pretty rare, especially at the higher levels of intelligence. A somewhat gifted child from average parents isn't a huge stretch. Below average parents producing a child with 160+ IQ would be suspicious. However, I think some of this question may be conflating income with intelligence.

Is there a correlation between parent IQ and child IQ? ›

Estimates. Various studies have estimated the heritability of IQ to be between 0.7 and 0.8 in adults and 0.45 in childhood in the United States.

How does mental age indicate the level of IQ? ›

mental age, intelligence test score, expressed as the chronological age for which a given level of performance is average or typical. An individual's mental age is then divided by his chronological age and multiplied by 100, yielding an intelligence quotient (IQ).

How do you estimate your IQ? ›

The IQ score can be calculated with the formula of IQ = (intelligence age/actual age) x100. Learning your IQ score with MentalUP's Culture Fair IQ test is easy. MentalUP IQ gives reliable results based on reference values. Unlike traditional IQ tests, it's quick, and you can learn your results instantly.

What is the IQ of an 8 year old with a mental age of 10? ›

For example, if in an intelligence test an 8 years old boy, Sudhir is found to have a mental age of 10 years, then his IQ would be 10/8 x 100 = 125.

What is an IQ formula? ›

The IQ of person is given by the formula, IQ = m / c × 100, where m is the mental age and c is the chromological age. If 80 ≤ IQ ≤ 140 for a group of 12 year children, find the range of their mental age.

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