Discover your cognitive abilities with our scientifically calibrated assessment. Get instant results with a detailed cognitive profile — completely free.
Our Free IQ Test is designed as a comprehensive general intelligence assessment. Using adaptive difficulty algorithms, the test adjusts to your performance level in real-time, ensuring accurate measurement across the full IQ spectrum from 70 to 160+.
Based on established psychometric principles including item response theory (IRT) and classical test theory (CTT). Each question has been calibrated through extensive statistical analysis to ensure reliable discrimination between ability levels.
IQ scores follow a normal distribution with a mean of 100 and standard deviation of 15. About 68% of people score between 85 and 115, while only 2% score above 130.
Adaptive difficulty, instant scoring, and a detailed cognitive profile across 5 domains. No registration needed — your results are calculated immediately upon completion.
Each domain is independently scored to give you a complete cognitive profile
Pattern recognition, abstract thinking, and sequential logic
Vocabulary, reading comprehension, and language processing
Numerical reasoning, arithmetic, and mathematical problem-solving
Mental rotation, spatial awareness, and geometric reasoning
Quick pattern matching and information processing efficiency
From start to finish in 20 minutes
Choose your demographic for age and gender-normed scoring
Complete 25 scientifically calibrated questions at your own pace
Receive your IQ score and percentile ranking instantly
Explore your detailed cognitive profile and download your certificate
Scores follow a normal distribution with a mean of 100 and standard deviation of 15
Our free IQ test uses deviation IQ scoring, the same methodology used in professional intelligence assessments like the Stanford-Binet Intelligence Scale and the Wechsler Adult Intelligence Scale (WAIS). Your raw score is compared against population norms to produce a standard score with a mean of 100 and a standard deviation of 15.
Each of the 25 questions is calibrated using Item Response Theory (IRT), ensuring that questions range in difficulty from accessible to highly challenging. This adaptive difficulty curve means the test accurately measures cognitive ability across the full spectrum — from average to highly gifted.
Your results include a breakdown across five cognitive domains: logical reasoning, verbal comprehension, quantitative ability, visual-spatial processing, and processing speed. This multi-domain approach provides a more complete picture than single-score tests, helping you understand not just how smart you are, but how you think.
Unlike many online IQ tests that provide inflated scores, our assessment is normed against a sample of over 14 million test takers, giving you a realistic and meaningful score. For a deeper cognitive analysis, you can also try our CHC Cognitive Assessment which measures 7 broad abilities, or our Mensa-style IQ test for high-ceiling pattern recognition challenges.
Our free online IQ test is designed for anyone aged 16 and older who wants a reliable estimate of their cognitive ability. Whether you're a student exploring your intellectual strengths, a professional curious about your IQ score, or simply looking for a scientifically grounded intelligence test, this assessment provides meaningful results in just 20 minutes.
This test is especially valuable for:
If you're specifically interested in whether you qualify for Mensa, we recommend our dedicated Mensa-style IQ test with its high-ceiling questions designed to identify the top 2%. For a clinical-style cognitive screening, our MoCA screening test evaluates memory, attention, and executive function across 8 domains.
Each test offers a unique perspective on cognitive ability
Our Standard IQ Assessment features 25 carefully calibrated questions based on the Stanford-Binet Intelligence Scale, measuring five core cognitive domains: memory, logic, problem solving, focus, and processing speed. 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.