Mensa IQ Requirements: Qualifying Scores and How to Join

The qualifying score: 98th percentile

Mensa's membership criterion is a percentile, not a fixed IQ number: you must score at or above the 98th percentile on an approved intelligence test, meaning you scored higher than about 98% of the general population. Because different tests use different scales, expressing this as a single IQ figure depends on which scale you mean.

The classification table below shows where the top 2% sits relative to the rest of the distribution.

Which tests qualify

Mensa accepts results from a wide range of standardised, properly supervised intelligence tests — not just its own. National Mensa organisations publish their own lists of approved tests, but commonly accepted instruments include:

• Wechsler scales (WAIS for adults, WISC for children).
• Stanford-Binet Intelligence Scales.
• Cattell Culture Fair tests.
• Raven's Progressive Matrices (in some jurisdictions).
• Mensa's own supervised admission test.

How Mensa testing works

If you don't already have a qualifying prior score, you take Mensa's supervised admission test. The format varies by country but typically follows this pattern:

1. You book a test session through your national Mensa organisation, often held at scheduled in-person sittings.
2. The test is proctored — administered under timed, supervised conditions to ensure a valid result.
3. It usually consists of one or more timed papers (often including a culture-fair, non-verbal reasoning component).
4. Your results are scored and you're told whether you reached the 98th percentile, generally within a few weeks.
5. If you qualify, you're invited to join; if not, policies on re-testing vary by national group.

Many national Mensa groups also accept 'prior evidence' — documented results from an approved test you've already taken, submitted for review instead of sitting Mensa's own test.

How to join

Joining is straightforward once you have a qualifying result:

1. Find your national or regional Mensa organisation (Mensa is global, organised by country).
2. Either book and pass their supervised admission test, or submit prior evidence from an approved test.
3. On qualifying, complete membership registration and pay the membership dues.
4. You then gain access to local groups, events, publications and the wider Mensa community.

How to prepare

You can't study your way past the 98th percentile, but sensible preparation helps you perform at your genuine level on the day:

• Familiarise yourself with the question formats (matrices, series, analogies) so the format isn't a surprise.
• Practise under timed conditions, since pacing is a real factor on proctored tests.
• Prioritise sleep, food and a calm mindset — test-day state genuinely affects performance.
• Treat practice as removing unfamiliarity, not as raising your underlying ability.