Free IQ Test — Accurate Intelligence Assessment

A scientifically-designed IQ test that uses Item Response Theory (IRT) and adaptive difficulty to provide accurate intelligence quotient scores. Features 6 cognitive domains, 45 questions, and instant results with confidence intervals — completely free and private.

How It Works

1
Start the test

Review the instructions and complete 3 practice questions to familiarize yourself with the format.

2
Complete 6 sections

Work through pattern matrices, sequences, spatial reasoning, logic, number series, and working memory tests.

3
Get your results

Receive your IQ score, percentile, confidence interval, and detailed domain breakdown. Download a PDF report.

Measure your intelligence with adaptive matrices, spatial reasoning, and pattern recognition

Psychology

Features

IRT Adaptive Scoring 6 Cognitive Domains Culture-Fair Design Instant Report

Frequently Asked Questions

Is this a real IQ test?

This test uses scientifically validated question types (progressive matrices, spatial reasoning, digit span) and Item Response Theory scoring. While it provides a reliable estimate of cognitive ability, it is not a substitute for a professionally administered test like the WAIS-IV.

How accurate is this test?

The test uses adaptive difficulty and IRT scoring to maximize accuracy. The 95% confidence interval shown with your results indicates the precision of your score. For most test-takers, accuracy is within ±5-8 IQ points.

What does my IQ score mean?

IQ scores follow a normal distribution with a mean of 100 and standard deviation of 15. A score of 100 means average intelligence. About 68% of people score between 85 and 115, and about 95% score between 70 and 130.

Is this test culture-fair?

Yes. All questions use abstract visual patterns, shapes, and numbers — no language comprehension, vocabulary, or cultural knowledge is required. This design is inspired by the Cattell Culture Fair Intelligence Test.

How long does the test take?

The full test takes approximately 25-30 minutes to complete, with 45 questions across 6 sections. Short breaks are offered between sections.

Can I retake the test?

Yes, you can retake the test as many times as you like. Your results history is saved locally on your device. Note that practice effects may slightly inflate scores on repeated attempts.

💡 Want us to improve this tool just for you?

We can — and it's free! Just send us a quick message with your idea. If you'd like to discuss it in detail, leave your email and we'll get back to you. You can stay anonymous.

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