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The Cattell-Horn-Carroll (CHC) theory is the most empirically supported and comprehensive model of cognitive abilities. It integrates three major theories of intelligence into a unified hierarchical framework with broad and narrow abilities.
Our CHC assessment measures 7 broad cognitive abilities, each assessed through targeted question types. This provides a nuanced cognitive profile rather than a single IQ number, helping identify specific strengths and areas for growth.
CHC theory identifies over 70 narrow abilities organized under broad factors. Research shows these abilities have different developmental trajectories — fluid reasoning peaks in early adulthood while crystallized intelligence continues growing throughout life.
Adaptive difficulty, instant scoring, and a detailed cognitive profile across 7 abilities. No registration needed — your results are calculated immediately upon completion.
Each domain is independently scored to give you a complete cognitive profile
Inductive and deductive reasoning with novel stimuli
Acquired knowledge, vocabulary, and comprehension
Spatial visualization, mental rotation, and pattern recognition
Phonemic awareness and sound discrimination
Rapid cognitive task execution and perceptual speed
Working memory capacity and attention
Associative memory and fluency of retrieval
From start to finish in 35 minutes
Choose your demographic for age and gender-normed scoring
Complete 35 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 Cattell-Horn-Carroll (CHC) theory represents the most widely accepted and comprehensive framework for understanding human intelligence. Developed through decades of factor-analytic research, the CHC model identifies 7 broad cognitive abilities that collectively define intellectual capacity.
Our assessment measures each of these abilities independently: Fluid Intelligence (Gf), Crystallized Intelligence (Gc), Quantitative Knowledge (Gq), Visual Processing (Gv), Auditory Processing (Ga), Processing Speed (Gs), and Short-Term Memory (Gsm). This multi-dimensional approach goes far beyond traditional single-score IQ tests.
Each of the 35 questions is mapped to one or more CHC abilities, and your scores are converted to standard scores (mean 100, SD 15) using deviation IQ methodology. The result is the most detailed cognitive profile available in any free online assessment.
The CHC model underpins modern clinical assessments including the Stanford-Binet Fifth Edition (SB5) and the Wechsler scales. If you'd like a quicker general assessment, our standard free IQ test takes just 20 minutes, or try our Mensa-style test for a high-ceiling pattern recognition challenge.
Scores follow a normal distribution with a mean of 100 and standard deviation of 15
The CHC Cognitive Assessment is the ideal choice for anyone seeking the most comprehensive free cognitive evaluation available online. If you want more than just a single IQ number — a full map of your cognitive abilities — this is the test for you.
This assessment is especially valuable for:
For a quicker assessment, our standard free IQ test covers 5 domains in 20 minutes. The Stanford-Binet test uses the gold standard methodology, while our MoCA screening focuses specifically on cognitive health indicators.
Each test offers a unique perspective on cognitive ability
Our CHC Cognitive Assessment features 35 questions measuring seven broad cognitive abilities based on the Cattell-Horn-Carroll theory — the most comprehensive empirical model of human intelligence. 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.