Based on the gold standard of intelligence testing with over 100 years of research. Measures five key cognitive factors across verbal and non-verbal domains.
The Stanford-Binet Intelligence Scale was first published in 1905 and is one of the oldest and most respected IQ tests in existence. Our online version preserves the five-factor model of the Stanford-Binet 5 (SB5) while adapting it for digital administration.
Each of the five cognitive factors is measured through both verbal and non-verbal routing subtests. This dual-domain approach provides a more complete picture of intelligence and reduces cultural bias in scoring.
The Stanford-Binet uses a standard age score (SAS) with mean of 100 and standard deviation of 15. Composite scores range from 40 to 160, with factor indices providing additional diagnostic detail.
Adaptive difficulty, instant scoring, and a detailed cognitive profile across 5 factors. No registration needed — your results are calculated immediately upon completion.
Each domain is independently scored to give you a complete cognitive profile
Logic, pattern analysis, and abstract problem-solving
Accumulated information, vocabulary, and comprehension
Number concepts, estimation, and problem solving
Form perception, spatial relations, and mental imagery
Short-term memory, attention, and mental manipulation
From start to finish in 30 minutes
Choose your demographic for age and gender-normed scoring
Complete 32 scientifically calibrated questions at your own pace
Receive your IQ score and percentile ranking instantly
Explore your detailed cognitive profile and download your certificate
The Stanford-Binet Intelligence Scale has been the gold standard of IQ testing since its introduction in 1916 by Lewis Terman at Stanford University. Our online adaptation faithfully implements the SB5 (Fifth Edition) scoring methodology, producing a deviation IQ score with a mean of 100 and standard deviation of 15.
Unlike simpler assessments, the Stanford-Binet evaluates intelligence through five cognitive factors: Fluid Reasoning, Knowledge, Quantitative Reasoning, Visual-Spatial Processing, and Working Memory. Each factor is scored independently, providing a nuanced cognitive profile rather than a single number.
Our 30 questions are calibrated using psychometric analysis to ensure reliable differentiation across the full IQ range. The test employs adaptive difficulty, meaning each question builds on the last, progressively challenging your cognitive limits.
For a different perspective on your intelligence, try our WAIS-style assessment which measures 4 index scales, or our CHC Cognitive Assessment based on the most comprehensive model of intelligence with 7 broad abilities. Our standard free IQ test offers a quicker 20-minute assessment covering 5 core domains.
Scores follow a normal distribution with a mean of 100 and standard deviation of 15
The Stanford-Binet IQ test is the right choice for anyone who wants a rigorous, academically respected measure of intelligence. As the oldest and most established IQ test in history, the Stanford-Binet methodology is trusted by psychologists, educators, and researchers worldwide.
This test is particularly well-suited for:
Want a broader cognitive evaluation? Our CHC assessment measures 7 abilities using the most comprehensive intelligence model available. If you're curious about Mensa eligibility, our Mensa-style IQ test includes high-ceiling questions designed for the top 2%.
Each test offers a unique perspective on cognitive ability
Our Stanford-Binet Assessment features 30 questions spanning five cognitive factors, modeled on the Stanford-Binet Intelligence Scale — the gold standard for deviation IQ scoring since 1916. Scores are normed against a global sample of over 27 million test-takers, giving you a meaningful comparison against a large and diverse population. While no online test is a substitute for a full clinical evaluation by a licensed psychologist, our methodology is grounded in peer-reviewed psychometric research and continuously refined to maximize reliability.
Test duration varies by assessment type, from 15 minutes for the MoCA screening to 45 minutes for the WAIS-style test. We recommend completing it in one sitting without interruptions for the most accurate results.
No — all our assessments are completely free. No registration, no credit card, no hidden fees. Take the test and view your full results instantly.
You'll receive your overall score, cognitive domain breakdown, percentile ranking compared to the general population, and a detailed interpretation of your cognitive strengths and areas for growth.
Yes, you can retake any test. We recommend waiting at least 1-2 weeks between attempts to ensure reliable results and minimize practice effects from question familiarity.