The most accurate
online IQ test

Test your cognitive abilities now!

Test your intelligence with our professional IQ test. With only 25 questions get an accurate IQ result including certificate.

Real-time tests


Total number of tests performed

✅  1,719,278

Average IQ


160 - 145: Highly Gifted
144 - 130: Gifted
129 - 115: Above Average

114 - 85: Average
84 - 70: Below average
70 - 0: Lower extreme value

The Online IQ Test

Before you start the IQ test, find a place where you can concentrate & focus.

You must complete a total of 25 questions - choosing the correct answer from 6 possibilities in each case.

After completion you will receive your IQ test result incl. BGI™ IQ test certificate and an individual evaluation of your cognitive abilities.

Average IQ Scores of the countries


1. Singapore


2. China


3. Hong Kong


11. Switzerland


18. Austria


21. Germany

IQ Test Reviews

Learn what our previous test graduates think about the Brain Graph Initiative™.

Rainer Staller

Very good IQ test. The questions were challenging but doable. In the beginning I didn't want to take the test because I was afraid of a bad result. In retrospect, it turned out that this fear was unjustified. I can recommend the IQ test to others.

Peter Keller

I had a question about the evaluation after the test, which is why I wrote to the support. They answered me immediately and were able to help me directly. That's what I call super customer support :)

Linus Hainer

The certificate looks good; especially with an IQ over 130 ;) I had taken an IQ test at school years ago, it took forever and I didn't get a proper evaluation then either.

4.6/5.0 (1359 Reviews)

What is an IQ test?

An IQ test (intelligence quotient) is a test used to determine the cognitive abilities of people. IQ tests can be used to determine both mental abnormalities and intellectual potential.

In the United States, the first official IQ tests were administered in the early 1900s to assess the intellectual abilities of school children and the mental health of patients.

Our certified IQ test

We have developed a 25-question IQ test to obtain the most accurate results possible. The test excludes the cultural peculiarities of different countries and aims to assess only the intellectual potential of a person.

The IQ test was designed to produce results with an average IQ of 100 and a standard deviation of σ = 15. Therefore, 2/3 of all results (which is about 67%) are between 85 and 115.

The test has a time limit of 25 minutes to complete. This maximizes the accuracy of the test and allows you to better assess your ability to solve problems quickly and accurately.

What does the IQ score mean?

Your IQ helps you identify strengths and weaknesses in the areas our test measures. Your score shows where you lie compared to others in your age group. IQ tests are normalized to a median score of 100 and a variance of 15. This means that the most common score is 100 and 2/3 of test takers score between 85 and 115. If your score is above 130, you are in the top 2% of people.

How important is the IQ value?

If you look statistically at the relationship between IQ and success, you find correlations in most areas. Not surprisingly, IQ is strongly correlated with academic performance, but personality traits such as conscientiousness are also strongly linked. A high IQ helps in many endeavors, but is not required and often not the most important trait.

With an IQ test, the IQ value of a person can be determined very accurately nowadays. It involves answering questions from different categories in a given time.

An IQ test approximates a person's IQ by asking questions from different categories. It excludes the cultural differences of different countries and the test aims to assess only the intellectual potential of a person.

The average IQ is 100. The majority, about 67% of people have an IQ between 85 and 115.

The highest IQ value measured so far is 230, making Terence Tao, a mathematician from Australia, currently the most intelligent person in the world.

In the past, you could only have your IQ tested at certain places. Now it is possible to test your IQ with the help of online IQ test, like ours.

Many of the online IQ tests should be taken with a grain of salt. Meanwhile, BGI IQ test has been established over several as one of the most reliable and accurate online tests. By evaluating over 1.5 million tests, the accuracy is very high.

IQ valueclassification
0-70Lower extreme
71-84Below average
85- 114Average
115-129Above Average
145-160Highly Gifted