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EnglishYou score 130 on the American version of the test. Your friend in Britain scores 148. You did equally well.
It reads like a typo, but it isn't. Both numbers point to the same thing: you land in the top 2 percent of the population. That threshold, not any single number, is the only ticket into Mensa.
So what does the admission test involve, what does it cost, and can you actually prepare for it? We'll walk through it plainly, myths aside.
Where Mensa Came From
Mensa was founded in 1946 in Oxford. A barrister named Roland Berrill and a scientist named Lancelot Ware built it around one deliberately narrow idea: a society whose only entry requirement is a high IQ. No politics, no religion, no pedigree, no job title.
The name is Latin for "table." It points to a round table where everyone sits as an equal, regardless of what they do for a living. Today the organization spans more than 140,000 members across over 100 countries, from national groups like American Mensa to British Mensa and dozens of others.
The sole membership criterion: a result in the top 2 percent of the population on an approved intelligence test. Nothing more, nothing less.
That condition hasn't changed since 1946. You have to score in the top 2 percent on an accepted test. Whether you happen to be a professor or a bus driver is beside the point.
What "Top 2 Percent" Actually Means
Top 2 percent sounds abstract, so let's translate it. That's roughly one person in fifty. In an ordinary classroom of thirty, often nobody clears the line; in a packed university lecture hall, you'd find a handful. It isn't a tiny caste of geniuses, but it isn't something most people reach either.
Now the confusing part. An IQ of 130 on one test and 148 on another can mean exactly the same thing. The difference comes down to the standard deviation, meaning how widely scores spread out around the average.
Most modern tests on the Wechsler scale use a standard deviation of 15. The average is 100, and the top-2% line lands around 130. British Mensa, though, has long used the Cattell III B scale with a standard deviation of 24, where that same line jumps to 148. Same person, same performance, different number on the page.
| Scale / test | Average | Standard deviation | Top-2% cutoff |
|---|---|---|---|
| Wechsler (WAIS, most tests) | 100 | 15 | ~130 |
| Cattell III B (British Mensa) | 100 | 24 | ~148 |
| Stanford-Binet (older versions) | 100 | 16 | ~132 |
So never ask "what IQ do I need for Mensa" without saying which test you mean. A number without a scale means nothing. The binding rule is always that same phrase: top 2 percent.
One more thing that often gets missed. Your score is measured against your own age group, not the whole population at once. A sixteen-year-old is compared with other sixteen-year-olds, a sixty-year-old with other sixty-year-olds. The same count of correct answers can translate into a different IQ depending on how old you are.
Time matters too. Tests have to be renormed periodically because population scores drift slowly upward. James Flynn documented a rise of roughly 3 points per decade in work published in 1984 and 1987. A test calibrated twenty years ago would put the 2% line somewhere other than where it actually sits today.
How You Actually Get In
There are two doors into Mensa, and both lead to the same place: proof that you cleared the top 2 percent.
The first door is a supervised admission test. In the United States, the Mensa Admission Test is a proctored session run by a certified administrator, made up of two short tests of logic and deductive reasoning. No essays, no interviews, no questions about your personal life. You mark your answers, hand the sheet in, and the result arrives later rather than on the spot.
The second door is prior evidence. American Mensa accepts scores from more than 200 standardized intelligence tests taken at any point in your life, as long as they place you in the top 2 percent. Older SAT results, a Stanford-Binet, a CogAT, a WAIS administered by a psychologist can all count, though Mensa appraises each submission and makes the final call. If you were tested years ago and scored high, you may already qualify without sitting anything new.
British Mensa works the same way in principle, with different papers on the table. Its supervised session uses two Cattell instruments, the Cattell III B and the Cattell Culture Fair III A. Clear 148 on the Cattell III B, or the equivalent on the culture-fair paper, and you're in the top 2 percent. Whichever scale measured you, every member sits above that same line.
Costs shift over time, so treat any figure as a snapshot. American Mensa currently charges around $60 to sit the Admission Test, and a similar fee to evaluate prior evidence, but check us.mensa.org for the current fee before you book. British Mensa sets its own price, listed on mensa.org.uk.
Age rules differ by country. American Mensa tests candidates from age 14, and younger children are pointed toward testing done by a school or a clinical psychologist instead. British Mensa opens its supervised test to anyone over about ten and a half. There is no upper limit anywhere, and an eighty-year-old is as welcome to sit it as a teenager.
Retake rules are worth verifying rather than assuming. American Mensa changed its policy in 2024 to let candidates who don't qualify retest after an eight-week wait, where it had previously allowed the Admission Test only once. Rules like these vary by national group and get revised, so confirm the current terms with the Mensa body in your country before planning a second attempt.
Clearing the line doesn't make you a member automatically, either. You still have to apply and pay the annual dues. Only then do the magazine, the local groups, and the rest of it open up.
What the Questions Look Like
Forget "who wrote Hamlet" or "what's 17 percent of 340." A Mensa-style test is culture-fair, which means it leans as little as possible on what you learned in school, what language you speak, or where you grew up. It measures your ability to see logic, not the facts you've collected.
In practice, most of it is about spotting logical relationships between shapes. The most common format is the matrix: a grid of figures, often 3x3, with one cell left blank. Your job is to work out the rule governing how the figures change and pick the missing piece from several options. This is the format John Raven made famous with his Progressive Matrices.
Here's a concrete example. Picture a 3x3 grid full of figures. Along each row, one line is added and the figure rotates a quarter turn. The final cell is empty, and you have to combine both rules, the added line and the rotation, to choose the figure that honors both. Harder items stack three or four such rules at once.
Alongside matrices you'll meet number and shape sequences to continue, figures to rotate in your head, and the odd one out to find in a set. All of it runs under time pressure, and that pressure accounts for a good half of the difficulty.
If you want to feel the matrix and sequence formats before the real thing, our free IQ test runs on the same principles. Walk into a proctored session having already seen the format, and it won't be foreign territory.
How to Prepare, and What Not to Kid Yourself About
Now the unwelcome part: preparation won't lift your IQ by twenty points. The fluid intelligence these tests measure is a fairly stable trait. A meta-analysis by Hausknecht and colleagues (2007) found that repeating a cognitive test raises scores by a few points at most, not dozens, and even that bump comes largely from knowing the format.
Which is exactly the part you can influence. If the first matrix you ever see is on the live test, you'll burn precious seconds just decoding what's being asked. A few dozen matrices solved in advance removes that surprise.
Take someone who drilled matrices at home and breezed through them. On the Mensa test, the clock rattled him; by the third item he was panicking, and he clicked through the rest more or less at random. His score didn't reflect what he could actually do. Training the format is, half the time, really training your composure.
What's Worth Doing
- Work through a few dozen matrix problems ahead of time so the format doesn't catch you off guard.
- Pacing matters: don't linger on easy items, and skip the hard ones to return to later.
- A full night's sleep beats a last-minute cram. One sleepless night dents cognitive performance about as much as mild intoxication (Williamson and Feyer, 2000).
- Arrive neither starving nor stuffed, since the brain burns roughly a fifth of your energy.
- Leave yourself time to spare, because rushing and stress bleed points for no reason.
What doesn't work: "brain training" phone apps and guaranteed tricks from the internet. You'll get better at that particular game, but it doesn't carry over to the general ability to solve new problems. And an honest question worth sitting with: do you want into Mensa for a line on your CV, or because a room full of people who enjoy thinking genuinely appeals to you?
What Membership Gives You, and What It Doesn't
Mensa isn't a genius certificate or a shortcut to a better job. It's mainly a community. Members get access to local and national gatherings, a members' area online, a magazine, and networks like SIGHT, which helps traveling members find a contact in an unfamiliar country.
Inside the organization there are special interest groups covering everything from chess to astronomy, and plenty of people join for those rather than the membership card. Youth branches run alongside the adult society too, so a bright child can move up into the main group later without starting over.
What doesn't it give you? It says nothing about your creativity, your empathy, your persistence, or whether you'll be content in life. An IQ test measures a narrow slice of ability. Someone with an IQ of 128 who works hard and gets along with people usually goes further than a Mensan leaning on a number alone.
So before you pay for a session, get clear on what you expect from it. As a sport for the mind and a way into a community on a similar wavelength, the test makes sense. As proof of your own worth, it's a dead end, and that holds whether you clear the top 2 percent or not.