What the Mensa Test Is Like, and How to Practise

Mensa is the best-known high-IQ society in the world, and its entrance test has a slightly mythical reputation. In reality it is a carefully run, timed test of reasoning, and the rules for passing it are published. What is less well known is how much the details differ between countries.

This guide sets out what the supervised test involves in the UK and the US, as described on Mensa's own pages in October 2026, the scores that count, and what research says about practising. LifeScore is independent and not affiliated with Mensa in any way.

What score does Mensa require?

Mensa International's rule is simple: membership is open to anyone who scores within the top 2% of the population on an approved intelligence test. Mensa International also states that online tests cannot be used for admission.

What that means as a number depends on the test, because different tests use different scales. American Mensa's published table of qualifying scores includes:

Test	Qualifying score	Scale (standard deviation)
Wechsler tests (full-scale IQ)	130	15
Stanford-Binet 5	130	15
Older Stanford-Binet	132	16
Cattell	148	24

These look different but describe the same point on the curve: two standard deviations above the average of 100, or about the 97.7th percentile. A Cattell 148 is not harder to reach than a Wechsler 130; it is the same level written on a wider scale. Strictly, the 98th percentile is a fraction higher (about 131 on a scale of 15), which is why you will see both numbers quoted.

What the supervised test involves

Mensa runs its own testing in many countries, and each national Mensa sets its own format, prices and rules. Mensa International tells candidates to contact their nearest national Mensa for the details. Here is what the UK and US organisations publish.

Mensa UK

Mensa UK offers two supervised routes. Its in-person supervised test sessions take about two and a quarter hours under strictly controlled conditions, and candidates must be over 10 and a half. It also offers an online supervised test in a fully proctored environment, with a session of about an hour and a half. Mensa UK describes the online version as two adaptive tests: a non-verbal diagrammatic test of fluid reasoning, and a vocabulary test. It needs a desktop or laptop with a webcam and microphone, photo ID and a quiet room.

At the time of writing, Mensa UK listed both options at £49. Results for the online test arrive within 10 days, and anyone who does not reach the threshold can resit after six months. Mensa UK also offers the Mensa Workout, 18 questions in 15 minutes, which it describes as entertainment rather than an IQ test.

American Mensa

American Mensa says its admission test takes one to two hours. You can take it at a local group session run by volunteer proctors (listed at $60 at the time of writing) or as a private, electronically administered test at a higher fee. You need photo ID with proof of date of birth. The standard test is not available to children under 14, who apply through prior testing instead, and you can test at most once every eight weeks.

American Mensa is explicit that unsupervised tests, including internet tests, are not accepted as evidence.

	Mensa UK	American Mensa
Session length	About 2.25 hours in person; about 1.5 hours online	1 to 2 hours
Formats	In person, or proctored online	Local group session, or private electronic test
Listed fee	£49	$60 for group testing; more for private
Minimum age for the test	Over 10.5	14
Retest	Online test: after six months	Once every eight weeks

Fees and rules change, so always check the national Mensa's own site before booking.

The prior-evidence route

You may not need to sit a Mensa test at all. Both organisations accept scores from approved tests taken elsewhere. Mensa UK accepts a full educational psychologist's report or documentary evidence of a professionally administered IQ test. American Mensa accepts scores from its published list, provided the test was given by a neutral, qualified third party; Wechsler tests must be complete administrations with a full-scale IQ. Documentation has to be original or certified.

Some old exam results also count in the US. American Mensa lists SAT scores from before 1994, for example, but not current SAT, ACT or GRE scores. The Mensa practice test guide sets out the full table.

What the questions are like

Mensa does not publish its test items, and you should be wary of anyone who claims to have them. From what the national organisations describe, you can expect timed questions on non-verbal reasoning (diagram and pattern puzzles) and, in some versions, verbal reasoning or vocabulary.

Pattern puzzles are the part most people find unfamiliar. Here is an original practice item in that general style. It is not a Mensa question.

The skill being tested is not maths. It is noticing that the relationship runs across the cells in a row, then checking that it holds in every row before choosing.

How to practise, and what the research says

Practice does raise scores, a little. The question is what kind of rise it is.

How much scores rise. A 2007 meta-analysis by John Hausknecht and colleagues pooled 107 samples and more than 134,000 people who retook cognitive ability tests. Scores rose by about a quarter of a standard deviation on average, and more when people had coaching or saw the identical test again. A larger 2018 meta-analysis by Jana Scharfen, Judith Peters and Heinz Holling found a gain of about a third of a standard deviation from a first to a second test, with gains levelling off after the third. On an IQ scale, a third of a standard deviation is about 5 points.

What kind of rise it is. Most of that gain comes from familiarity: knowing the formats, managing the clock, feeling calmer. A 2007 analysis by Jan te Nijenhuis and colleagues found that retest gains are not gains in general intelligence itself. The score goes up without the underlying ability changing much.

That suggests a sensible plan:

1. Learn the formats. Work through matrix, series and odd-one-out puzzles until none of the question types surprise you. A few hours spread over a couple of weeks is plenty.
2. Practise against a clock. Mensa tests are timed. Set yourself short timed blocks and practise moving on from an item that is stalling you, then coming back.
3. Check rules one feature at a time. On pattern items, look at shape, number, colour, size and direction separately. Most errors come from spotting one rule and missing a second.
4. Sleep properly. A 2010 meta-analysis by June Lim and David Dinges found that short-term sleep deprivation hurts attention and vigilance most strongly, and a long timed test depends on both.
5. Do not over-practise. Gains level off quickly. Doing hundreds of puzzles mainly makes you good at puzzles.

Here is a second practice item that rewards checking one feature at a time.

What practice cannot do

Practice can stop you losing points to unfamiliarity and nerves. It cannot reliably turn a typical score into a top 2% score. If you score just below the line once, practice and a retest might tip you over; if you are well below it, they almost certainly will not.

It is also worth remembering what a Mensa score is: one measurement, with a margin of error, of reasoning on one day. Being just below the threshold says nothing worrying about you, and being just above it does not make you a different person.

If you want a low-stakes warm-up first, the LifeScore IQ test is a 25-question online visual reasoning test, timed at about 12 minutes. It is not a Mensa test, it is not connected to Mensa, and its score is an estimate (not age-adjusted or normed against a representative sample), so it cannot predict whether you would qualify. Treat it as practice with the format, nothing more.

Questions people ask

How hard is the Mensa test?

It is designed so that only about 2% of people reach the qualifying score. The questions start easier and get harder, and the time limits are tight, so most people do not finish everything comfortably.

Can I take the Mensa test online?

Mensa UK offers its own proctored online test with webcam supervision. American Mensa offers a private electronically administered test. Unsupervised online quizzes, including Mensa's own practice quizzes, cannot qualify you.

How much does the Mensa test cost?

At the time of writing, Mensa UK listed its supervised tests at £49, and American Mensa listed local group testing at $60. Prices vary by country and change, so check the national Mensa's site.

Can I retake the Mensa test?

Rules vary. American Mensa allows testing once every eight weeks. Mensa UK lets you resit its online test after six months. Practice effects mean a retest score can be a few points higher without any real change in ability.

Is IQ 130 enough for Mensa?

On a full Wechsler or Stanford-Binet 5 test, yes: American Mensa accepts a full-scale IQ of 130. On the Cattell scale the equivalent is 148.