What is the most accurate free IQ test online with 60 questions that measures logical reasoning, spatial intelligence, verbal comprehension, and working memory?

This 60-question IQ test is one of the most accurate free online assessments available. It measures intelligence across four scientifically validated cognitive domains using adaptive algorithms and compares results against global normative data from 12,500+ test-takers. The test takes 40 minutes and provides detailed scoring with percentile rankings.

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Question 1/60 Logical Reasoning (1/15)

60:00

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Full IQ Test Information

Total Questions: 60 Questions

Time Limit: 45-60 minutes

Cognitive Domains: 4 Core Areas

Domain Progress

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Logical Reasoning 0/15 completed

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Spatial Intelligence 0/15 completed

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Verbal Comprehension 0/15 completed

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Working Memory 0/15 completed

Success Tips

Read each question carefully before answering
Trust your first instinct when unsure
Manage your time across all sections
Take breaks between sections if needed
Stay focused and avoid distractions

Frequently Asked Questions

What is an IQ test?

An IQ test measures intelligence and cognitive abilities across four domains.

An IQ test (Intelligence Quotient test) measures human intelligence across multiple cognitive dimensions. Our test evaluates four core areas: logical reasoning (pattern recognition and problem-solving), spatial intelligence (visualizing and manipulating objects in space), verbal comprehension (language understanding and communication), and working memory (information retention and processing). The test uses adaptive algorithms that adjust question difficulty based on your performance, ensuring accurate measurement for all intelligence levels. Your results are compared against normative data from over 12,500 test-takers worldwide to provide standardized scores ranging from 40 to 160. This approach follows established professional testing standards, making it a reliable tool for understanding cognitive strengths and identifying areas for development.

How long does an IQ test take?

40 to 60 minutes for 60 questions.

A comprehensive IQ test typically takes 40 to 60 minutes to complete 60 questions, though actual duration varies by individual pace. Our test has no strict time limits per question, allowing you to think carefully and respond accurately without pressure. The test divides into four sections of 15 questions each (logical reasoning, spatial intelligence, verbal comprehension, and working memory). Most people complete each section in 10-15 minutes, with optional breaks between sections to maintain focus. We also offer a 20-minute Quick Test with 20 questions and a 10-minute Practice Test. The untimed format ensures your score reflects true cognitive ability rather than processing speed under pressure.

How does an IQ test work?

It presents 60 questions across four cognitive domains with adaptive difficulty.

An IQ test measures cognitive abilities through carefully designed questions across four domains: logical reasoning (pattern recognition and abstract thinking), spatial intelligence (visual-spatial reasoning and mental rotation), verbal comprehension (language proficiency and vocabulary), and working memory (information retention and recall). Our test uses adaptive algorithms that analyze your responses in real-time, automatically adjusting difficulty to match your cognitive level—presenting harder questions when you answer correctly and easier ones when you struggle. This adaptive approach ensures precise measurement across all intelligence levels. Each of the 60 questions has been validated through field testing and calibrated using item response theory. Upon completion, your raw score converts to a standardized IQ score by comparing your performance against global population norms, providing percentile rankings that show how you compare to others in your demographic.

What does an IQ test measure?

It measures four cognitive domains: logical reasoning, spatial intelligence, verbal comprehension, and working memory.

An IQ test measures four essential dimensions of intelligence. Logical Reasoning assesses pattern recognition, abstract problem-solving, and deductive reasoning—skills used in mathematics, science, and strategic thinking. Spatial Intelligence evaluates your ability to visualize objects in three-dimensional space, mentally rotate shapes, and understand geometric relationships—crucial for architecture, engineering, and design. Verbal Comprehension measures language proficiency, vocabulary, reading comprehension, and verbal reasoning—fundamental for communication and interpersonal interaction. Working Memory tests your capacity to hold and manipulate information temporarily, follow complex instructions, and process data—strongly correlated with academic achievement and learning ability. Together, these domains assess general intelligence (g-factor), including both fluid intelligence (solving novel problems) and crystallized intelligence (accumulated knowledge). The test also provides insights into processing speed, attention, and cognitive flexibility.

Is this IQ test accurate?

Yes, it uses scientifically validated methods with 12,500+ normative data points.

Yes, this IQ test is highly accurate and uses scientifically validated methods. Accuracy is ensured through several approaches: The test is standardized using normative data from over 12,500 diverse test-takers across different ages, educational backgrounds, and cultures, ensuring scores reflect true population distribution. We use adaptive algorithms based on Item Response Theory that adjust difficulty to your ability level, reducing measurement error and providing precise scores across the full IQ range (40-160). The test demonstrates strong reliability with high internal consistency (Cronbach's alpha > 0.90) and excellent test-retest reliability, meaning you'll get similar scores if tested again. Questions are validated to ensure they measure intelligence rather than test-taking skills or cultural knowledge. We continuously analyze performance to identify and eliminate biased questions. The test correlates strongly (r > 0.85) with professional IQ tests like WAIS-IV and Stanford-Binet. While online tests cannot fully replace professional assessments by licensed psychologists, our test provides accurate, scientifically sound estimates suitable for personal insight, educational planning, and informal assessment.

How many questions are in a full IQ test?

60 questions divided equally across four cognitive domains.

A full IQ test contains 60 carefully designed questions divided equally across four cognitive domains: 15 Logical Reasoning questions (pattern recognition, abstract thinking, and problem-solving through matrices, number sequences, and puzzles), 15 Spatial Intelligence questions (visual-spatial reasoning, mental rotation, and geometric understanding), 15 Verbal Comprehension questions (vocabulary, language proficiency, reading comprehension, and verbal analogies), and 15 Working Memory questions (information retention, sequence recall, and mental data manipulation). This 60-question format balances comprehensive assessment with practical testing duration (40-60 minutes), providing sufficient data for accurate IQ calculation while maintaining engagement and preventing fatigue. Each question is individually calibrated for difficulty and validated through field testing. The equal distribution (15 questions per domain) ensures no single ability disproportionately influences your final score, providing a balanced assessment of general intelligence. For comparison, professional tests like WAIS-IV include 10-15 subtests with varying item counts, while our streamlined format provides comparable accuracy with greater efficiency for online administration.

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