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Free IQ Test.

IQ test

Try a warm-up first

Which piece fills the gap? It doesn’t count towards your score.

Pick a length

Not sure which to pick? See how the tests differ

You get 15 minutes and most people need about 10. Stuck on one? Skip it and come back later.

The puzzles are created and marked right here in your browser. Your answers are never uploaded, and nobody asks for your email.

Practise and learn

Practise one area

8 untimed puzzles, each answer explained as you go. No score, just practice.

Learn how to solve them

Free mini-courses: the method, a worked example and the common traps.

Today’s puzzle

A new one every day. It doesn’t count towards a test score.

At a glance

Altto IQ test: quick facts

A free online IQ test you can take in about 10 minutes, with your score straight away and no sign-up.

Updated

Price
Free. No sign-up, no email, no paywall for your score.
Length
20 questions with a 15-minute limit (most people finish in about 10 minutes), a quick 10-question test in about 5 minutes, or the 40-question Complete test (about 25 minutes).
What it tests
Pattern, numerical, spatial, and verbal and logical reasoning. The Complete test adds working memory and processing speed.
Difficulty
Starts easy and gets genuinely hard: all 20 right on the Standard test is an IQ of about 142, reached by about 1 in 400 people. The Complete test goes further: all 40 right is about 148, and scores are capped at 150.
Scoring
Item response theory, reported on the standard IQ scale (average 100, standard deviation 15), with your percentile.
Your results
Shown the moment you finish, with a breakdown by area, every answer explained, how you compare, a free certificate you can download as an A4 PDF or a picture, with its own ID and QR code that anyone can check at altto.co.uk/verify, and a full 5-page PDF report.
Privacy
Puzzles are made and marked in your browser and your answers are never uploaded. Only your score, test type, date and country go into an anonymous pool so you can see how you compare.
Retakes
As many as you like, with fresh puzzles every time.
Official score?
No. It is an online estimate for personal interest, not a clinical result, and Mensa does not accept online tests.
What it measures

How the IQ test works

Answer 20 puzzles covering patterns, numbers, shapes and logic within 15 minutes, or take the shorter 10-question test. Your score, percentile and a breakdown by area appear as soon as you finish.

Pattern reasoning

Grids and sequences of shapes with hidden rules to spot — the classic matrix puzzles at the heart of most IQ tests.

Numerical reasoning

Number sequences, number grids and symbol puzzles. No calculator needed — it’s about spotting patterns, not long sums.

Spatial reasoning

Mirror images, rotated shapes, folded paper and cube nets — picturing and turning shapes in your head.

Verbal & logical reasoning

Analogies, odd-one-outs, letter codes and logic puzzles that reward careful, step-by-step thinking.

How it works

Ten minutes, then your full result straight away

No account, no email, and no waiting for a score to be “processed” — it’s worked out on your device the moment you finish.

  1. 01

    Choose your test

    Standard (20 questions) for the most accurate score, or Quick (10 questions) if you’re short on time. The puzzles are generated fresh for every attempt.

  2. 02

    Solve at your own pace

    Skip, flag and come back to questions until the timer runs out. Most people finish the standard test in about 10 minutes.

  3. 03

    Get your score

    Your estimated IQ, percentile and strengths in each area, plus a review of every question with an explanation of the answer.

IQ score chart

IQ score chart: what IQ scores mean

The average IQ is 100, and most people score within 15 points of it (that 15 is the standard deviation). Here’s how scores are usually described, and roughly how many people fall in each range. See also: what is the average IQ?

IQ scoreDescriptionShare of people
130+Exceptionally highabout 2%
120–129Very highabout 7%
110–119High averageabout 16%
90–109Averageabout 50%
80–89Low averageabout 16%
Under 80Below averageabout 9%
7080901001101201309%16%50%16%7%2%

IQ scores follow a bell curve: most people are near the middle.

IQ score to percentile

Your percentile is the share of people who would score lower than you. These follow from the standard IQ scale (average 100, standard deviation 15).

IQ scorePercentileHow common
702nd1 in 44 at or below
8516th1 in 6 at or below
10050th1 in 2 above
11584th1 in 6 at or above
12091st1 in 11 at or above
13098th1 in 44 at or above
14599.9th1 in 741 at or above
We tested it

How many questions do you need right? We ran 40,000 test scores

To show what the scoring actually does, we ran the test’s own puzzle generator and scoring code on 40,000 simulated standard tests (20 questions each), taken by test-takers spread across the whole IQ range, plus 20,000 tests answered completely at random. Each simulated person answered each puzzle the way its difficulty rating predicts. Updated 8 October 2026.

Score for each number of right answers (standard test)

Right answersTypical IQ8 in 10 scored
0–3 of 2057–67below 70
4 of 207265–76
5 of 207669–80
6 of 207974–84
7 of 208377–87
8 of 208782–91
9 of 209186–94
10 of 209490–98
11 of 209894–101
12 of 2010299–104
13 of 20106102–108
14 of 20110106–111
15 of 20114111–115
16 of 20118115–119
17 of 20122121–124
18 of 20128126–129
19 of 20134133–135
20 of 20142141–143

The same number of right answers doesn’t always give the same score, because the harder puzzles count for more: 12 right usually means an IQ of about 102, but anywhere from 99 to 104 depending on which 12.

  • Guessing gets you about 62. Answering every question at random typically got 3 of 20 right and a score of 62. Only 1 in 100 random guessers scored above 78, and none of the 20,000 reached 100.
  • The top score is about 142, for all 20 right. Above about 135 the test can’t tell people apart well: simulated people with a true IQ of 145 usually scored around 135.
  • Retakes move by about 6 or 7 points. The same person taking two different sets of puzzles typically scored 6 to 7 points apart, and 9 times in 10 within 16 points. That’s why your result comes with a likely range.
  • The likely range is honest. It is meant to hold your true score 8 times in 10, and in the simulation it did so 83% of the time.

These figures show how the scoring behaves; they aren’t results from real people. Real scores also depend on how well the difficulty ratings match real test-takers, and on things like tiredness and rushing.

A free IQ test that’s actually free

Plenty of “free” IQ tests ask for your email or card details before they’ll show your score. This one shows your full result the moment you finish, and runs entirely in your browser like every other tool on Altto.

  • No email, no paywallYour score, percentile, strengths, answer review and certificate are all free, with nothing to sign up for.
  • Fresh puzzles every attemptQuestions are generated for each test and checked so each has exactly one right answer — so you can retake it without remembering the answers.
  • Honest scoringHarder questions count for more, lucky guesses are allowed for, and you get a likely range rather than a flattering single number.
0

Emails, sign-ups or payments needed to see your result. Everything runs on your device, and your answers are never uploaded.

Free vs paid

What paid IQ sites charge for, free here

Many IQ test sites let you answer every question and then charge to show your results, often through a small trial that turns into a monthly subscription. Here’s what some of them charge for, and what you get on Altto for nothing.

What you getWhat some sites chargeOn Altto
Your full score and percentileTest-IQ.org: full results come with a 7-day trial that renews at $39.99 a monthFree, the moment you finish
Breakdown by areaMyIQ: full breakdown needs membership, $1 for 7 days then $29.99 every 28 daysFree, 4 areas (6 in the Complete test)
Detailed reportIQ Institute: premium report $1.95 plus a trial that renews at $29.95 a month. IQTest.com: detailed profile $14.95Free 5-page PDF report
CertificateIQ Genius Lab: certificate included in its subscriptionFree, with an ID, QR code and a page anyone can use to check it
A longer, fuller test123test: professional versions $12.99 eachFree 40-question Complete test, including working memory and processing speed
Comparisons, lessons and practice–Free: how you compare with other test-takers, jobs and famous names; your score history; mini-courses and practice for every area

Prices from each site’s own pricing or terms pages, checked 26 October 2026; they can change. Sources and the full list of 12 sites are in our guide: Which online IQ tests are actually free? No online test, free or paid, gives an official IQ score.

FAQ

Frequently asked questions

How the score is worked out, and what it can and can’t tell you.

How can I test my IQ for free?
Take Altto’s free IQ test on this page: choose the Quick test (10 questions, about 5 minutes), the Standard test (20 questions, about 10 minutes) or the Complete test (40 questions), press Start and answer the picture and logic puzzles. Your IQ score, percentile and full breakdown appear the moment you finish, with no sign-up, email or payment at any step, and the certificate and PDF report are free too. For the most reliable free result, take the Standard or Complete test somewhere quiet, in one go. An official, clinical IQ score needs a supervised test such as the WAIS, given by a psychologist, which is not free.
Do I have to pay to see my score?
No. The whole test is free: your score, percentile, breakdown by area, every answer explained, the certificate and the full PDF report. There is no sign-up, no email and no waiting, and you will never be asked to pay to see or speed up your result. Your score appears the moment you finish.
Is there a free IQ test with a certificate and a full report?
Yes. Altto’s IQ test gives you a certificate with its own ID and QR code, which anyone can check at altto.co.uk/verify, and a 5-page PDF report: your score, percentile and likely range, your ability profile by area, every question with its difficulty and your answer, how you compare with other test-takers, typical scores by job and famous names, and a practice plan. It is all free, with no sign-up. There is also a free 40-question Complete test that adds working memory and processing speed.
Why do other IQ tests ask you to pay at the end?
Some sites let you take the test for free and only ask for payment, or a small fee that turns into a subscription, once you have finished and want to see your score. Altto doesn’t: your score, percentile, breakdown, answers and certificate are all free, with no sign-up and no card details. If a test asks for payment before showing your result, read the small print for a repeating charge before you pay. See which online IQ tests are actually free.
How accurate is this IQ test?
It gives a solid estimate, not an official score. Every question has a difficulty rating, and your result is worked out from which questions you answered correctly using item response theory — the same family of methods behind professional tests — so hard questions count for more than easy ones. It isn’t a clinical assessment, though: only a supervised test such as the WAIS, given by a psychologist, can give you an official IQ. Treat your result as a good indication, and expect it to move by a few points between attempts, which is why a likely range is shown alongside it.
What is a good IQ score?
IQ scores are scaled so the average is 100. About two-thirds of people score between 85 and 115, and about 95% score between 70 and 130. Anything from 110 up is above average, 120 or more is very high, and 130 or more puts you in roughly the top 2% of the population.
What is the average IQ?
The average IQ is 100, by design. IQ tests are scaled so that the middle score of the people they were standardised on is 100, with a standard deviation of 15, so about half of people score below 100 and half above. That holds in the UK too: a test normed on UK adults puts the UK average at 100. Tables of “average IQ by country” mix different tests, years and samples and are widely criticised, so treat them with caution.
What is the highest score you can get on an IQ test?
There is no single maximum: each test has its own ceiling. The WAIS-IV, one of the most widely used professional tests for adults, reports full-scale IQs from 40 to 160. Altto’s test reports scores from 55 to 150, because beyond those points there are too few very easy or very hard questions to tell people apart reliably. Claims of IQs far above 160 come from old age-ratio formulas or estimates, not from modern tests.
Does your IQ change with age?
Not much once you are past your teens. An IQ score compares you with people of your own age, so 115 at 20 and 115 at 60 mean the same position. A 2024 review of studies (Breit and colleagues) found that scores are unstable in pre-school children, become steadier through childhood and stay highly stable from late adolescence to late adulthood. Raw speed and memory do change with age; age-normed scores allow for that. Altto’s test compares you with adults in general, not by age band.
Which IQ test is the most accurate?
A supervised test given by a qualified psychologist, such as the WAIS for adults or the WISC for children, is the most accurate, and it is the only kind accepted for clinical use or by Mensa. An online test gives an estimate. If you take one online, look for plenty of questions (20 or more), a time limit, a scoring method it explains, a likely range rather than a single number, and no payment to see your result. Altto’s Standard (20 questions) and Complete (40) tests do all five.
Is there a harder IQ test for people who usually score high?
Yes. The Top 2% challenge is 30 reasoning puzzles (patterns, numbers, shapes and words) with a 35-minute limit, and most of them are in the hard half of the difficulty range. It is built to be most precise for people scoring roughly IQ 120 to 145, around the 130 line that marks the top 2% of the population. In our simulated tests (made-up test-takers, not real people), its typical error for someone whose true score is 130 was about 5 points, against about 8 on the Standard test and about 6 on the Complete test. Below about IQ 100 it measures less well, so use the Standard test there. Its result adds the chance that your true score is 130 or more. It is free, with no sign-up, and like every online test it cannot be used to join Mensa or any other high-IQ society, which accept only supervised tests. See how the Mensa test works and what it costs and how this test is scored and how accurate it is.
How does Altto’s IQ test compare with the Mensa IQ Challenge?
Both are free online tests with harder puzzles as you go, and neither can be used to join Mensa. The Mensa IQ Challenge is 35 puzzles in 25 minutes and is offered for entertainment; if you score under 100 it says your score is outside the range it can measure. Altto’s Standard test is 20 puzzles in 15 minutes, and its 40-question Complete test takes about 25 minutes, the same time as Mensa’s. Altto reports every score from 55 to 150 with a likely range and percentile, a breakdown across patterns, numbers, shapes and words (plus memory and speed in the Complete test), every answer explained, and a free certificate and PDF report. Many people take both for a second opinion.
Is this IQ test hard?
It starts easy and gets genuinely hard. Each test runs from warm-up puzzles to ones only a few people solve, and harder puzzles count for more. In 40,000 simulated tests, getting all 20 right on the Standard test gave an IQ of about 142, which only about 1 in 400 people reach, and 18 of 20 was about 128. If you want the toughest version, take the 40-question Complete test, which adds working memory and processing speed: all 40 right lands at about 148. The scale itself reports scores from 55 to 150, so 150 is the cap rather than a score a perfect run usually reaches.
How is my score worked out?
When you finish, the page estimates your ability from your pattern of right and wrong answers, taking each question’s difficulty into account and allowing for lucky guesses. That estimate is converted to the standard IQ scale (average 100, standard deviation 15), and your percentile is the share of people you’d be expected to outscore. The difficulty ratings are careful estimates rather than figures from a formal norming study, so treat the result as an estimate rather than a precise measurement.
How many questions do I need to get right to score 130?
On the standard 20-question test, 18 right usually gives an IQ of about 128 and 19 right about 134, so 130 usually takes 18 or 19 out of 20, depending on which questions you get right, because harder puzzles count for more. All 20 right on the standard test gives about 142, and all 40 right on the 40-question Complete test about 148.
What IQ would I get if I just guessed every answer?
About 62. In 20,000 simulated tests answered completely at random, the typical guesser got 3 of 20 right and scored 62. Only 1 in 100 scored above 78, and none reached 100.
How much will my score change if I take the test again?
Usually by about 6 or 7 points. When we ran the test’s own scoring on simulated people taking two different sets of puzzles, their two scores were typically 6 to 7 points apart and 9 times in 10 within 16 points. Familiarity with the puzzle types can also lift a second score a little.
How long does the test take?
The standard test has 20 questions and a 15-minute limit — most people finish in about 10 minutes. The quick test has 10 questions and an 8-minute limit, and takes about 5 minutes. The standard test gives a more precise result because it has twice as many answers to go on.
Can I retake the test?
Yes, as often as you like. The puzzles are generated fresh for every attempt, so you won’t get the same questions twice. Scores often rise a few points on a second try simply because the puzzle types feel familiar, so your first attempt is usually the fairest measure.
Why is there a time limit?
IQ tests measure how well you solve unfamiliar problems, and working against the clock is part of that — given unlimited time, most people could eventually work through every puzzle. The limit is generous and most people finish with time to spare. Unanswered questions count as wrong, so it’s worth making a guess before the time runs out.
Can I use my score to join Mensa?
No. High-IQ societies such as Mensa only accept results from supervised tests, so no online test can be used to join. This test is for your own interest — though if you score 130 or more, a supervised test might be worth a try.
Can children take this test?
It’s designed for adults and older teenagers. Children’s IQ scores are worked out by comparing them with other children of the same age, which this test doesn’t do, so a child’s result here wouldn’t mean the same thing.
Can I improve my score?
A little, with practice: people usually do better on types of puzzle they’ve seen before, which is why official tests are only taken occasionally. Read the result as a rough guide to how you reason on this kind of puzzle today, not as a fixed measure.
Is there a practice mode?
Yes. Under the Start button, pick one area (patterns, numbers, shapes, or words and logic) for 8 untimed puzzles from easy to hard. You see straight away whether each answer is right, with the explanation, and finish with how many you got right. Practice doesn’t give an IQ score or a certificate, and it doesn’t count towards your results.
Does being tired or rushed affect the result?
Yes. Tiredness, distractions and notifications popping up mid-puzzle all pull scores down, so take the test somewhere quiet when you have 15 minutes free. A phone works, but a bigger screen makes the shape puzzles easier to see.
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