Three deviations below the mean
A model boundary—not a diagnosis
IQ alone cannot diagnose intellectual disability. Adaptive functioning, developmental history, test validity, and professional assessment all matter.
What does an IQ of 150 mean?
On a theoretical mean-100, SD-15 normal model, IQ 150 is 3.33 standard deviations above the mean, approximately the 99.96th percentile, and about 1 in 2,331 at or above. That calculation does not authenticate a score or replace the test publisher’s norms.
Scroll to move through the scale
Percentile99.957th
Rarityabout 1 in 2,331
Position+3.33σ
About 3.33 standard deviations aboveApproximately the 99.96th percentile
Start below the average and keep scrolling.
The score, percentile, and rarity remain visible while statistical landmarks and famous claims enter the story.
Approximately the 2nd percentile
A commonly discussed clinical threshold
A score near 70 is often discussed in diagnostic contexts, but a number by itself is not sufficient for diagnosis or support decisions.
Search intent: 70 IQOne standard deviation below
Still inside the broad middle of the curve
On the mean-100, SD-15 model, about 16 percent of the population falls at or below this point.
Search intent: 85 IQ50th percentile
The model average
Modern IQ scales are commonly centered on 100. It is a standardized midpoint, not a percentage correct.
Search intent: average IQApproximately the 75th percentile
Above the model average
An IQ of 110 is higher than roughly three quarters of the modeled population on an SD-15 scale.
Search intent: is 110 IQ goodOne standard deviation above
Approximately the 84th percentile
This is a useful statistical landmark: about 16 percent of the modeled population is at or above it.
Search intent: 115 IQApproximately the 91st percentile
Is 120 IQ good?
It is clearly above the model average. Descriptive labels vary between tests and should not be treated as universal categories.
Search intent: 120 IQApproximately the 95th percentile
Around one person in twenty
An IQ of 125 is statistically uncommon, but a real score still carries measurement error and test-specific norms.
Search intent: 125 IQApproximately the 97.7th percentile
The widely searched 130 IQ threshold
Often described as gifted or very superior, although labels and eligibility rules differ. The upper-tail model is about 1 in 44.
Search intent: 130 IQ percentileApproximately the 99.6th percentile
A very rare modeled score
At this point small measurement differences can produce large-looking rarity changes. Test ceilings and confidence intervals matter.
Search intent: 140 IQThree standard deviations above
Approximately the 99.87th percentile
This is about 1 in 741 at or above under the model. Extra decimal places should not be mistaken for test precision.
Search intent: 145 IQAbout 3.33 standard deviations above
Approximately the 99.96th percentile
Under the mean-100, SD-15 model, IQ 150 is about 1 in 2,331 at or above. At this extreme, test ceilings, confidence intervals, and instrument differences matter more than extra decimal places.
Search intent: 150 IQDisputed claimA famous unsupported claim
Einstein is commonly assigned 160
No verified Einstein IQ test record exists. The number belongs on the scale as a disputed public claim, not as his measured score.
Search intent: Einstein IQEnd of the reviewed scale
Extreme numbers require more—not less—skepticism.
Test ceilings, measurement error, incompatible scales, and unsupported public claims make precision beyond this point especially unreliable.
Approximately the 99.96th percentile
Under the mean-100, SD-15 model, IQ 150 is about 1 in 2,331 at or above. At this extreme, test ceilings, confidence intervals, and instrument differences matter more than extra decimal places.
Read the model, then read the test report.
The percentile shown here comes from a smooth normal distribution. A real assessment is normed for a particular test edition, age group, and reference sample. Its score report may provide a different rounded percentile and a confidence interval.
At high scores, apparent precision becomes especially misleading. Test ceilings, measurement error, practice effects, and differences between instruments matter more than extra decimal places.
What this number cannot establish
- It cannot verify that an online or reported score is genuine.
- It cannot diagnose giftedness, disability, or any condition.
- It cannot predict a person’s achievements, values, or future.
- It does not make scores from different tests interchangeable.