9 reliable IQ tests
1. Wechsler adult intelligence scale (WAIS)
The WAIS is one of the most trusted adult IQ tests that measures cognitive abilities, intended for ages 16 and above. WAIS-III is the most recent version of the test and takes about 60-75 minutes to complete. Although the free online versions evaluate the same skills and typically only take about 15-30 minutes to complete, they are not as reliable as the official version.
2. Mensa practice test
Mensa is the world's largest and oldest high-IQ society, and only those who score in the 98th percentile or higher are accepted. The Mensa practice test asks questions that are aligned with the skills commonly tested by IQ assessments and provides an equivalent score that corresponds to a person’s IQ range. Although just 30 minutes long, the practice test gives you a good idea of how you would do on the official admissions test.
3. Stanford-Binet intelligence scales (SBIS)
This is currently one of the most widely used and highly regarded IQ tests. The most recent edition, the SB-V assessment, is divided into 10 subtests, each of which takes about 5 minutes to complete. The subtests cover each of the five cognitive ability factors in depth:
- Fluid reasoning
- Knowledge
- Quantitative reasoning
- Visual-spatial processing
- Working memory
Although the official Stanford-Binet is not available online, several online IQ tests have been inspired by and based on the same skills. The online versions typically consist of 30 questions and take very little time to complete.
4. Brain metrics initiative (BMI) online IQ test
The test advertises itself as the most accurate online IQ test available in the United States. The test consists of only 20 questions and provides an IQ score, IQ certificate, and performance report outlining intellectual strengths and weaknesses. This test is widely regarded as one of the more reliable online IQ tests because the distribution of results is comparable to official IQ tests, such as the WAIS and the Stanford-Binet, whereas many other online IQ tests may exaggerate scores.
5. Woodco*ck-Johnson (WJ) test of cognitive abilities
The test can be taken by children as young as 2 years old and adults up to 90 years old. Unlike many other IQ tests, the WJ requires reading and writing and is thought to provide a very detailed understanding of intelligence, with each subtest taking about 5 minutes to complete.
6. IQ test labs
This is a timed assessment that consists of 30 questions. After 15 minutes, it is automatically scored. The test assesses the same abilities as some of the most popular IQ tests, such as visual or spatial abilities and logical reasoning. Score reports will indicate your strengths and weaknesses.
7. Raven’s progressive matrices (RPM)
The RPM is the world's leading nonverbal intelligence test and requires no reading or writing to complete. Although the exam is not timed, it typically takes 45 minutes to complete.
8. Psychtests
Psychtests are a set of IQ tests that assess several aspects of intelligence, including logical reasoning, math skills, and general knowledge. They evaluate your ability to categorize, analyze, and determine relationships between objects and ideas.
9. Rutherford intelligence analysis
Created by Duke and Harvard University psychology experts, this test claims to be the most accurate online IQ assessment. In terms of question format and difficulty, the test was designed to be representative of official IQ tests, and questions are constantly calibrated for accurate scoring.
