How you identify decides which Stanford-Binet norm group reads your score. Every answer is final once you give it.
How do you identify?
Built for learning and curiosity, not a professional evaluation. Your first 5 days cost $1.99, and it is $19.99 a month after that. Cancel in one click. Country and promotion can move the price.
The Stanford-Binet Intelligence Scale has been in service since 1916 and now runs in its fifth edition (SB-5). This The Official IQ Test assessment mirrors that framework: 25 questions spread over the 5 core cognitive factors the official SB-5 measures. Out comes a deviation IQ on the standard 100-point scale, with a per-factor breakdown showing exactly where your strengths sit.
Comparing yourself against SB-5 norms, warming up for a clinical assessment, or simply checking your IQ inside a structured framework: 18 minutes covers all of it. Taking it costs nothing and no account is needed to start. Scoring follows the same standard deviation-IQ method the official Stanford-Binet uses, so your number lines up directly with other Stanford-Binet reports.
People search for this under many names: "Stanford-Binet SB5", "SB5 IQ test", "Stanford Binet 5", or simply "Stanford Binet practice test". Every one points at the same fifth-edition framework, and this page serves all of them. What comes back is a true deviation IQ on the 100-point scale (M=100, SD=15), the metric the official SB-5 uses, and a practical dry run before any clinical SB5 administration.
Solving problems you have never met through abstract patterns and analogies. Reasoning on the spot, with no prior knowledge needed.
Crystallised intelligence: the vocabulary, facts and concepts you have absorbed and integrated over the years.
Reasoning with numbers, and with the relationships that hold between them.
Mental rotation and spatial relationships: picturing shapes and moving them in 2 and 3 dimensions.
Holding and manipulating information in mind, central to learning, comprehension and hard problems.
The Stanford-Binet Intelligence Scale is among psychology's longest-standing IQ tests. Its current SB-5 edition measures 5 factors: fluid reasoning, knowledge, quantitative reasoning, visual-spatial processing and working memory. This The Official IQ Test test mirrors that framework online.
Taking it costs nothing and no account is needed to start. Your full report and downloadable certificate sit inside a paid membership you can cancel in one click.
Around 18 minutes. 25 questions rising in difficulty, spread across the 5 SB-5 factors, with no per-question timer.
On the 100-point scale 100 is exactly average, and roughly two-thirds of people score between 85 and 115. Above 130 is considered gifted (top ~2%), above 145 highly gifted (top ~0.1%). Your The Official IQ Test report names your exact position and percentile.
100, by definition. The scale is centred on 100 with a standard deviation of 15, which puts about 68% of people between 85 and 115.
Both return a deviation IQ on the 100-point scale. Stanford-Binet 5 works through 5 factors. Wechsler scales (WAIS, WISC) work through 4 indexes. Stanford-Binet has historically covered a wider age range, while Wechsler dominates adult clinical settings.
Yes. Once you finish you can open a The Official IQ Test certificate carrying your Stanford-Binet-style IQ score, your percentile and your factor breakdown.
No. The Official IQ Test is an online assessment shaped by the SB-5 factor structure. The official Stanford-Binet 5 is administered in person by a licensed psychologist. This version exists for education and self-assessment.
Yes. Full-access members retake the assessment whenever they like and track factor-level progress over time. A single-test purchase covers one report.
Both. The official SB-5 is normed from age 2 through 85 and over, one of very few intelligence tests with a single continuous norm across the whole lifespan. This The Official IQ Test version is calibrated for adults aged 16 and over. For younger users, an in-person SB-5 with a licensed psychologist is the right route.
Deviation IQ is the scoring method every modern Stanford-Binet test uses, as do the Wechsler scales. Rather than dividing mental age by chronological age, the old ratio IQ, it places your raw score on a normal distribution with a mean of 100 and a standard deviation of 15. A deviation IQ of 130 sits 2 standard deviations above average, near the 98th percentile. Every score this page returns is a deviation IQ.
It is a Stanford-Binet practice test: an SB5-style online assessment modelled on the official factor structure. The real SB-5 is administered in person by a licensed psychologist with standardised materials. This version is a fast way to read your deviation IQ across the 5 SB5 factors before any clinical administration, or simply to check your cognitive profile.