What Is The Average IQ Score By Age?


IQ, or intelligence quotient, is a number that represents certain aspects of an individual’s cognitive skill. It essentially measures your ability to apply logical reasoning and to solve problems.

The way IQ is measured depends on how you perform on a specific test compared to others of your age group. So, understanding average IQ score by age is an important distinction to make.

What is intelligence? How do you know if you’re a smart person? Well, let’s have a look at how IQ scores are calculated and how average IQ score by age can differ.

How Are IQ Scores Measured?

According to Dennis Garlick of the UCLA Department of Psychology, IQ test’s score is based on a formula: child’s mental age divided by their chronological age and multiplied by 100.

100 is the average score for most IQ tests.

The number of questions answered correctly on a test — also known as the raw score — is averaged for children of varying ages. That score is then compared to the averages to determine a child’s average IQ score by age.

IQ tests measure several cognitive abilities, including spatial reasoning, fluid reasoning, and verbal intelligence.

Let’s have a look at a practical example of how to calculate an IQ score and what scores are considered poor and superior.


What Is The Normal IQ Of A 12 Year Old?

If a 10-year-old child’s raw score on their IQ test was the same as that of the average 12-year-old, that child would be assigned a mental age of 12. And if we were to calculate that child’s IQ level using the formula mentioned previously, we would get:

Mental Age/Chronological age multiplied by 100 =

(12/10)100 = 120

Now, if we were to measure the IQ score of a 15-year old with the same mental age, we would get:

(12/15) = 80

Keep in mind that both children have the same raw scores on their IQ tests but the IQ score differs because of their different ages.

What IQ Should A 14 Year Old Have?

The purpose of these tests is to compare children with others of their own age to get a measure of relative intelligence. This way, a child’s absolute intelligence increases when their brain matures at the age of 16.

What IQ score should a 14 year old have? Well, should and shouldn’t are dangerous words to use when it comes to IQ. Generally speaking, IQ scores for 14-year-olds range from 95-105. But anything outside this range is also perfectly acceptable.

As Jim Kwik, Author of Mindvalley’s Superbrain Program says, “We need to understand how our minds work so we can work our minds better.”

Is 120 A Good IQ Score?

Any IQ score of 120 and above is considered to be in the gifted range.

But understanding whether or not 120 is considered to be a “good” IQ score will make more sense in the context of general population.


What Is The Normal Range For IQ?

When it comes to grasping the average IQ score by age, the range definitely varies.

There are a number of different IQ tests that are administered by licensed psychologists. There are also a series of subtests that are designed to measure language skills, mathematical abilities, memory reasoning and so on.

The most common types of IQ tests include:

    • The Wechsler Adult Intelligence Scale for Adults
    • The Wechsler Intelligence Scale for Children
    • The Kaufman Assessment Battery for Children
    • The Cognitive Assessment System
    • The Differential Ability Scales

In all of these tests, any score between 80-119 is considered average. IQ scores that are 80 or below are considered below average. The range between 120–129 is considered well-above-average, and any score in the 130-145 range is viewed as superior.

What’s important to remember about IQ tests is that they’re only capable of measuring a narrow set of cognitive abilities. And new research in this field has revealed that we may actually possess up to nine different types of intelligence. And you can develop each of them by learning and improving your brain functions. 

Have you ever taken any of the intelligence tests mentioned above? Share your experience in the comments below.



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We are dedicated to ensuring that humans live happier, healthier, and more fulfilled lives by plugging in the gaps that conventional education failed to teach us.

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