A 'genius' IQ traditionally starts at 140, while 130 and above is labeled 'very superior' on modern tests. Scores that high are extremely rare, and the famous IQ numbers you see for historical figures are almost always estimates, not measured results.
A score of 140 or above is the traditional genius threshold. This cutoff comes from Lewis Terman's early Stanford-Binet classifications, where 140+ was labeled 'genius or near genius.' Modern tests have largely retired the word 'genius' as imprecise, preferring measured categories instead.
130+ is the 'very superior' band, the highest standard category on tests like the Wechsler scales. It marks the top 2% of the population (98th percentile) and is the same cutoff Mensa uses for gifted-level intelligence. About 1 in every 44 people scores at or above 130.
Genius-level scores are vanishingly rare and get exponentially rarer as the number climbs. Roughly 1 in 261 people reach 140, about 1 in 741 reach 145, and only about 1 in 31,560 reach 160. Because the bell curve thins so quickly at the top, each extra five points represents a dramatic jump in scarcity.
Einstein never took a modern IQ test, so any figure quoted for him is an estimate, not a measurement. The commonly cited '160' is a retrospective guess, not a real score. His scientific achievements demonstrate extraordinary insight, but no validated IQ result exists for him.
The highest claimed IQs (such as William Sidis or Marilyn vos Savant at around 228) are unverified and rely on outdated ratio-scoring methods. Modern deviation-based tests are not considered reliably valid much above 160, so extreme three-digit figures cannot be meaningfully compared to today's scores. Treat any 'highest IQ' claim with healthy skepticism.
| IQ threshold | Classification | Percentile | Rarity (1 in N) |
|---|---|---|---|
| 130+ | Very superior / gifted (Mensa cutoff) | 98th (top 2%) | 1 in 44 |
| 140+ | Genius (traditional Terman label) | 99.6th (top 0.4%) | 1 in 261 |
| 145+ | Highly gifted | 99.9th (top 0.1%) | 1 in 741 |
| 160+ | Profoundly gifted / near test ceiling | top ~0.003% | 1 in 31,560 |