Superior intelligence, strong reasoning, roughly top 10% · Rarer than 1 in 32
🏛️ Mensa cutoff 130 — 2 points away
🌍 In the United States (national average ≈ 98, an estimate from test samples), an IQ of 128 is in the top 2.3%.
What an IQ of 128 means. Smarter than 96.9% of people. Classification: Superior — Superior intelligence, strong reasoning, roughly top 10%. Rarer than 1 in 32.
IQ
Classification
Percentile
100
Average
50.0%
120
Superior
90.9%
130
Very Superior / Gifted
97.7%
❓ FAQ
Is an IQ of 128 a good score?
An IQ of 128 falls in the "Superior" range and is higher than 96.9% of the population.
What percentile is an IQ of 128?
An IQ of 128 sits at the 96.9th percentile — the top 3.1% of the population. Roughly 1 in 32 people score this high.
Can you join Mensa with an IQ of 128?
Mensa requires roughly IQ 130 (top 2% on SD15); 128 is 2 points below the cutoff. Practice and a supervised test may close the gap.
How many people have an IQ of 128 or higher?
Roughly 250,889,507 people worldwide — about 3.1% of 8.1 billion.