Mensa vs Intertel (and Triple Nine): High-IQ Societies Compared
Mensa vs Intertel comes down to the cut-off. Mensa takes people who score in the top 2% on an approved intelligence test (about IQ 130 on the common mean-100, SD-15 scale). Intertel is stricter: the top 1%, about IQ 135. Above both sit the Triple Nine Society (top 0.1%) and the Prometheus Society (roughly 1 in 30,000).
Before you chase any of these, it helps to know where your reasoning is strong and where it slips, and IQ Tester shows that across four question types. Find my weak spots
Mensa vs Intertel at a glance
| Mensa | Intertel | |
|---|---|---|
| Founded | 1946, in England | 1966, in the US |
| Cut-off | Top 2% (98th percentile) | Top 1% (99th percentile) |
| Approx. IQ (SD 15) | 130 | 135 |
| Size | Large: national groups in many countries | Small |
| How you qualify | Its own supervised test, or an accepted score from another approved test | Accepted score from an approved test |
| Vibe | Social clubs, local meetups, events, special interest groups | Smaller, more newsletter- and discussion-based |
The short version: Mensa is the big, famous, social one. Intertel is the smaller, quieter step up.
Entry cut-offs: top 2%, top 1%, top 0.1%
High-IQ societies set their bar as a percentile, not a raw number, because different tests use different scales. A score of 130 on a test with a standard deviation of 15 sits at about the same percentile as 132 on a test with an SD of 16. That's why you'll see slightly different "Mensa IQ requirement" numbers floating around.
Here is roughly what each cut-off means on the usual SD-15 scale:
- Top 2% (Mensa): about 130. Around 1 in 50 people.
- Top 1% (Intertel): about 135. Around 1 in 100.
- Top 0.1% (Triple Nine): about 146. Around 1 in 1,000.
- About 1 in 30,000 (Prometheus): about 160.
What about "Mensa average IQ"?
Mensa doesn't publish an official average member IQ. By definition every member scored at or above the 98th percentile on a qualifying test. Anything you see claiming a precise Mensa average is a guess.
Mensa vs Triple Nine vs Prometheus
Triple Nine Society
Founded in 1978, the name is literal: you need to score at the 99.9th percentile. Much smaller than Mensa, and focused on members talking to members (online and through its journal).
Prometheus Society
Founded in 1982, with one of the highest cut-offs of any well-known society, around the 99.997th percentile. At that level, standard IQ tests struggle to measure accurately, so it only accepts a short list of approved tests. Membership is tiny.
Mensa vs Densa
Densa isn't a real society. It's a decades-old joke: a "club" for people who are proudly not geniuses, with tongue-in-cheek quizzes. If you see a "Densa quiz" on TikTok, it's meant to be funny.
How the societies rank
| Society | Cut-off | Roughly 1 in... | Best known for |
|---|---|---|---|
| Mensa | 98th percentile | 50 | Size, events, local groups |
| Intertel | 99th percentile | 100 | Small community, publications |
| Triple Nine | 99.9th percentile | 1,000 | Member discussion, journal |
| Prometheus | ~99.997th percentile | 30,000 | Extreme cut-off |
Higher cut-off doesn't mean "better club." It just means fewer people can join.
What members actually do
This is what people really want to know when they ask "is Mensa prestigious?"
Mensa members typically:
- Go to local meetups (game nights, pub quizzes, dinners).
- Join special interest groups (from sci-fi to board games to languages).
- Attend regional and national gatherings.
- Read the society's magazine.
Intertel, Triple Nine and Prometheus members typically:
- Write for and read the society journal.
- Take part in online discussion.
- Meet up less often, since there are fewer members spread over a wide area.
None of these societies are career networks in the LinkedIn sense, and none give you anything on a CV that most employers would weigh heavily. They're communities for people who enjoy puzzles, ideas and talking to other people who do too.
Can teens join?
Often, yes, but rules differ by country, so always check your national society's website.
- Mensa has members of all ages. In some countries, younger children qualify by submitting a score from an approved test given by an educational psychologist, while older teens and adults can sit Mensa's own supervised test. The minimum age for that supervised test varies by country.
- Intertel, Triple Nine and Prometheus generally rely on scores from approved tests, which tend to be the kind given by professionals.
Mensa IQ test alternatives
If you're curious but not ready to book a supervised session:
- Practice online with mixed reasoning questions to see if you even enjoy this.
- Check if you already have a qualifying score. Some societies accept results from certain school or professional tests; their sites list which.
- Take the official supervised test when you're ready.
An online test can't get you into any of these societies. It can tell you whether you're curious enough to bother, and which question types you'd need to work on.
The tough part is honesty with yourself. Almost everyone thinks they're "probably Mensa level" until they meet the hard pattern questions.
IQ Tester gives you a reality check in a few minutes. Twenty untimed questions across number series, verbal analogy, logic and pattern, easiest first, with harder ones counting for more. You see your band and three of your four category strengths free; no percentile is shown until real norms exist, so you won't get a fake "top 2%" badge. Find my weak spots
Is joining worth it, or just a flex?
Depends entirely on why you want in.
Worth it if:
- You love puzzles, board games and nerdy debates and don't have people to do them with.
- You'd actually go to events.
- You're after community, not status.
Probably a flex if:
- The main goal is the bio line.
- You want it to prove something to someone.
- You wouldn't go to a single meetup.
We go deeper on this in is Mensa worth it. And if you're wondering whether a high score even means you're "smart" in the everyday sense, read smart vs intelligent difference. For school-age gifted testing, see gifted vs smart.
Check your reasoning before the Mensa vs Intertel decision
Whichever society tempts you, it starts with knowing how you actually reason. Sign in with Google or Apple, answer 20 untimed questions, and get your band plus three category strengths free. If you want the exact score on a 58-142 scale and a full question review, that's an optional one-time $7.99 unlock.
FAQ
What is the difference between Mensa and Intertel?
Mensa accepts the top 2% (about IQ 130 on an SD-15 scale) and is large and social. Intertel accepts the top 1% (about 135) and is smaller and more discussion-based. Both need a score from an approved, properly supervised test.
What IQ do you need for Mensa?
You need to score at or above the 98th percentile on an approved test. On the common mean-100, SD-15 scale that's about 130; on tests with a different SD, the number is different but the percentile is the same.
Mensa vs Triple Nine: which is harder to get into?
Triple Nine, by a lot. It needs the 99.9th percentile (about 1 in 1,000), while Mensa needs the 98th (about 1 in 50).
Can an online IQ test get you into Mensa?
No. Mensa and the other societies only accept supervised tests or approved professional assessments. Online tests are useful for practice and curiosity, not for membership.
Is Mensa prestigious?
It's famous, and a lot of people find it interesting, but it isn't a career credential most employers care about. Its real value is the community, events and interest groups, if you'd actually use them.