Quick Answer
The test below gives you 45 questions split evenly across three domains: 15 spatial reasoning (visual matrices), 15 logical reasoning (number and pattern sequences) and 15 verbal reasoning (vocabulary and analogies). If you select Basic or No English at the start, the verbal block is automatically swapped for a non verbal visual reasoning set so the test stays fair.
Your raw score is weighted by question difficulty, calibrated by age and education level, and mapped to the standard IQ scale where 100 is the population average. You get an estimated IQ, a percentile rank, a category label (average, high average, superior, gifted) and a domain by domain breakdown showing which reasoning systems are your strongest. Most people finish in 25 to 35 minutes.
Online tests are useful self estimates, not clinical diagnoses. For a certified score, only an in person test administered by a licensed psychologist (such as the WAIS or Stanford Binet) is considered authoritative. Your answers stay in your browser and are never transmitted.
Cognitive Assessment
The free IQ Test built to challenge you
Measure your cognitive potential across spatial, logical, and verbal reasoning.
45 questions calibrated to your background for a fair, accurate result.
25-35 min · Instant results · No data transmitted
Three Domains Tested
01
Spatial
3×3 matrix grids with multi-rule pattern completion
15 Questions02
Logical
Sequences, algebra, abstract multi-step reasoning
15 Questions03
Verbal
Adapted to your English level for full fairness
15 QuestionsEducational purposes only · Not a clinical tool · Results stay on your device
What is an IQ test?
An Intelligence Quotient (IQ) test is a standardised assessment that measures your underlying capacity for logic, pattern recognition and problem solving. Unlike a school exam, it is not testing what you know. It is sampling how efficiently your reasoning systems work under varied conditions.
Modern IQ scores follow a normal distribution (the bell curve) calibrated so the population average is exactly 100, with a standard deviation (a measure of how spread out scores are) of 15 points.
What does the test measure?
Our assessment samples three scientifically grounded domains to build a balanced cognitive profile.
| Domain | What it measures | Question style |
|---|---|---|
| Spatial / Numerical | Visual logic and quantitative reasoning | Patterns, geometry, algebraic puzzles using shapes and numbers. |
| Logical | Analytical processing and deduction | Number sequences, syllogisms, word problems. |
| Verbal | Language comprehension and abstraction | Synonyms, antonyms, analogies and odd one out. |
Together these tap into both fluid intelligence (Gf), the ability to reason about novel problems, and crystallised intelligence (Gc), the knowledge and vocabulary you have built up over time.
How to interpret your IQ score
| Score range | Category | Population share |
|---|---|---|
| Below 70 | Below Average | Around 2% |
| 70 to 84 | Low Average / Borderline | Around 14% |
| 85 to 115 | Average | Around 68% |
| 116 to 129 | High Average to Superior | Around 14% |
| 130 and above | Gifted and beyond | Around 2% (top of the curve) |
The bell curve in plain English
Because IQ is calibrated to a normal distribution, you can read your percentile straight off the curve. A score of 100 means you scored higher than 50% of the population. A score of 115 puts you above 84%. A score of 130 puts you above 97.7%.
This is why a small number difference at the top of the scale represents a much rarer result than the same gap in the middle. Going from 100 to 115 is common. Going from 130 to 145 is genuinely rare.
How to take the test for an honest result
- Environment: a quiet, distraction free room and a full battery on your device.
- State: well rested, hydrated and not under acute stress. Sleep loss can shave several points off a single sitting.
- Pacing: do not rush. Speed is factored in lightly, but reckless guessing costs you more than thinking it through.
- Honesty on the profile: age and education are used to calibrate your raw score. Inflating either gives you a misleading number.
Frequently asked questions
Is this online IQ test actually free?
Yes. The full score, percentile and domain breakdown are returned instantly with no email, no account and no paywall. Everything runs in your browser.
How do I know my IQ level?
Take a calibrated online test for a quick estimate, then if you want a certified number arrange a proctored Mensa test or a session with a licensed psychologist who can administer the WAIS or Stanford Binet.
How long does the test take?
About 8 to 12 minutes. Going faster than 5 minutes usually means you skipped reasoning and the result will be unreliable.
Why does the test ask for my age and education?
IQ is a comparative measure. A 16 year old answering 12 of 15 correctly demonstrates a different cognitive percentile than a 45 year old hitting the same score. Your demographic inputs calibrate the raw result against population norms.
What is a good IQ score? Is 97 IQ low?
By definition 100 is the exact average, so 97 is squarely inside the average band (90 to 109) where the majority of people sit. It is not low.
Is 72 a low IQ?
72 sits in the borderline range. It is just above the threshold (around 70) that clinicians use, alongside adaptive functioning checks, to consider an intellectual disability diagnosis.
Is a 0 IQ score even possible?
No. Standardised tests have a floor, usually around 40 or 50. A literal zero would imply no measurable brain function, which the test cannot capture.
What is a 17 year old's average IQ?
Exactly 100, just like every other age group. IQ tests are age normed, so a 17 year old's raw score is compared only against other 17 year olds.
Is this test clinically accurate?
It is one of the better online estimates because the scoring uses age and education calibration on a normal distribution. It is not a clinical diagnosis. Only a proctored test from a licensed psychologist (like the WAIS-IV) can deliver that.
Will guessing hurt my score?
Yes. The scoring algorithm subtracts a small amount for wrong answers to discourage random clicking. Educated guesses are fine, brute force guessing is not.
What is the strongest predictor of IQ? Is it genetic?
Genetics accounts for roughly 50 to 80% of the variance in adult intelligence, but it sets potential, not destiny. Early childhood nutrition, education quality and socio-economic stability decide how much of that potential is reached.
Is intelligence inherited from the mother?
The X chromosome carries a disproportionate number of genes linked to brain development. Boys inherit their single X entirely from their mother, which gives maternal genetics an outsized statistical role. But thousands of genes from both parents shape the final outcome.
Do twins have the same IQ?
Identical twins typically score within 5 points of each other even when raised apart. Fraternal twins are closer than ordinary siblings but show wider gaps than identical twins.
Can someone have a low IQ but still be smart?
Absolutely. IQ does not measure emotional intelligence, creativity, artistic skill, practical street smarts or empathy. Many highly successful people score average on traditional IQ tests.
What are the main criticisms of IQ tests?
Cultural and linguistic bias toward Western educational backgrounds, the reduction of a complex mind to a single number and the historical misuse of scores to justify discrimination. Modern test design tries to mitigate the bias, but the criticism is fair and important.
Do schools still use IQ tests?
Yes, but not for general ranking. They are used to identify gifted students for advanced programmes and to help diagnose specific learning differences so children can receive tailored support.
Is my data private?
100% yes. The whole tool runs client side. Your name, age and answers stay in your browser tab and disappear the moment you close it.
Can I take the test on my phone?
Yes, the layout is fully responsive. A tablet or laptop screen still gives you the most comfortable view for the longer reasoning questions.
Our testing methodology
- Question pool: 15 calibrated items, balanced across spatial / numerical, logical and verbal reasoning, with difficulty rated 1 to 5.
- Weighted difficulty: harder questions earn more points (each level above 1 adds roughly 13% to that item's value).
- Wrong answer penalty: a small deduction (0.25) is applied to incorrect answers to discourage random guessing.
- Processing speed: faster average response times earn a small bonus, very slow responses lose a small amount.
- Age and education calibration: raw scores are adjusted using age multipliers and an education weighting before being mapped to the standard IQ curve.
- Score mapping: the adjusted raw score is converted to a z score and then to an IQ on the standard 100 mean, 15 SD scale, capped at 55 to 148 for a 45 question test.
- Percentile: calculated from the same z score using a numerical approximation of the normal distribution.
Related tools
Cognitive performance is closely linked to your physical state. Pair the IQ test with these for a fuller picture:
- Sleep Calculator because sleep loss can knock several points off a single test sitting.
- Stress Calculator to check if chronic load is dampening your reasoning speed.
- Breathing Timer to settle your nervous system before retesting.
- TDEE Calculator to make sure your brain is fuelled for sustained focus.
Important disclaimer
This is a free online reasoning quiz for entertainment and self-reflection. It is not a clinically validated IQ test such as the WAIS-IV, Stanford-Binet or Raven's, and the score it produces must not be used for any diagnostic, educational placement, employment, immigration or membership purpose.
If you need a formal IQ assessment, book a session with a licensed psychologist who can administer a properly normed instrument under controlled conditions.
See the full site-wide Disclaimer & Notice for the complete terms that apply to every calculator and tool on dmbio.
