1.2 %
Smarter than 1.2% of people
Extremely Low
Well below average, often benefits from extra support
🏛️ Mensa cutoff 130 — 64 points away
🌍 In the United States (national average ≈ 98, an estimate from test samples), an IQ of 66 is in the top 98.4%.
❓ FAQ
Is an IQ of 66 a good score?
An IQ of 66 falls in the "Extremely Low" range and is higher than 1.2% of the population.
What percentile is an IQ of 66?
An IQ of 66 sits at the 1.2th percentile — the top 98.8% of the population.
Can you join Mensa with an IQ of 66?
Mensa requires roughly IQ 130 (top 2% on SD15); 66 is 64 points below the cutoff. Practice and a supervised test may close the gap.
How many people have an IQ of 66 or higher?
Roughly 8,005,187,373 people worldwide — about 98.8% of 8.1 billion.