— IQ Score Explained
What does an IQ of 75 mean?
An IQ score of 75 places you 1.67 standard deviations below the population mean of 100. In a normed distribution this is the bottom 5% of test-takers — most clinical and educational frameworks classify this as the "Borderline" band.
This sits below the population mean but within the normal range. Intellectual disability is conventionally defined as IQ below 70 — well below this score.
What 75 represents in practice
→Pause. Find out YOUR IQ before you keep reading.Performance is somewhat slower on abstract reasoning tasks compared to the median, but fully within normal functional range. Real-world success is overwhelmingly driven by motivation, conscientiousness, and domain practice — not raw IQ.
Where 75 sits in the full distribution
→Curious how YOU score? 20-min calibrated test.- IQ 85 — one SD below mean (16th percentile)
- IQ 100 — population mean (50th percentile)
- IQ 115 — top 16% (High Average)
- IQ 120 — top 9% (Superior)
- IQ 130 — top 2.3% (Highly Gifted, Mensa cutoff)
- IQ 140 — top 0.4% (Genius)
- IQ 145 — top 0.13% (Profoundly Gifted)
Measurement uncertainty matters
→The numbers above? Find out where YOU land.A single IQ score is always an estimate. The standard error of measurement on a well-calibrated test is typically ±5 points, so an IQ of 75 corresponds to a 95% confidence interval of roughly 65–85. If your result feels surprising, sleep, stress, and test familiarity can each shift a single-session score by 5-10 points.
Take the Core Brain IQ test →