What Is The Lowest IQ Ever Recorded In Human History?

lowest IQ ever

There’s a lot of discussion today about what IQ scores mean and what IQ tests measure, but many people are still not quite sure what these numbers entail.

If you’ve ever wondered what the highest or lowest IQ ever recorded was, we’ve got you covered.

What’s Measured On An IQ Test?

What is intelligence? It’s a difficult question to answer. Many have tried, without much success.

But a few have developed theories of human intelligence that have stood the test of time. One of those theories belongs to Charles Spearman and his theory of generalized intelligence.

Generalized intelligence, or the “g factor,” is what’s primarily measured on IQ tests.

How Does IQ Work?

Our intelligence quotient is a score derived from standardized tests which measure specific cognitive skills. It gauges how well an individual can use information and logic to make predictions or answer questions.

IQ tests are a relative test, not an absolute one. Put another way: IQ tests do not measure intelligence the way a ruler measures height, but rather the way a race measures speed.

So, what’s the available range of IQ scores? What’s the highest and lowest IQ ever recorded?


What Is The Lowest IQ You Can Get?

Having a high or low IQ may shed some light on your ability to solve certain types of problems. But it’s important to remember that IQ tests only measure a very narrow set of traits.

That said, what’s the lowest IQ ever recorded? Is it possible to have an IQ score of 0?

Average IQ on most tests is 100. Anything below that is considered to be lower than average IQ, and anything above it is considered to be above average.

Is there such a thing as the lowest IQ ever? Well, this is very tricky territory. Generally speaking, IQ scores ranging below 70 points are often held by those with some form of mental or cognitive impairment.  

Can A Person Have An IQ Of 0?

In theory, yes. But has someone actually obtained this score? Well, no.

IQ scores in this range are difficult to determine, as people with mental impairments and disabilities typically aren’t asked or required to complete IQ tests.

No one has officially scored 0 on an IQ test, even if that result is theoretically attainable.

What Does An IQ Of 75 Mean?

Having an IQ score of 75 or below is generally considered to be a flag for mental or cognitive impairment.

In the past, this was one of the primary methods used to determine mental disability. Today, we have much more sophisticated methods of diagnosing disability.

What Does It Mean To Have A Borderline IQ?

According to experts, an IQ of 70 or below is considered a low score. Borderline IQ, also called borderline intellectual functioning, is someone with an IQ between 70 – 85 points.

Why is this called borderline IQ? Because it is on the borderline of criteria for the diagnosis of intellectual disabilities.

What’s The Highest IQ Attainable?

We’ve explored the range of lower IQ, but what about high IQ? What’s the highest score ever attained?

Most of today’s standardized IQ tests have the average score set at 100. A score of 140 and above is considered as genius level. Studies show that about 68% of people score somewhere between 85 – 115.

The highest IQ ever belonged to William James Sidis, with an estimated score of 250 – 300 points.

What Was Einstein’s IQ?

Measuring Einstein’s IQ is tricky. Why? Because he never actually took an IQ test in his lifetime!

Most experts believe his IQ score ranged between 160 – 190 points. Another person with a similar IQ range was none other than Stephen Hawking.

What’s most important to remember that IQ scores are not indicative of success in today’s world. What matters more is your willingness to learn.

As Jim Kwik, Author of Mindvalley’s Superbrain Program explains, “Learning is a superpower. And learning is not a spectator sport.”

With enough study and training, you can raise your IQ score. These numbers aren’t fixed to us for a lifetime.

But keep in mind that IQ scores only measure a very narrow set of cognitive skills. And we’re only just beginning to understand about the true power of the brain through multiple forms of intelligence.

So, what’s your opinion on high and low IQ scores? Let us know 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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