An IQ score is not a measure of how much intelligence you have. It is a statement about where your performance on a particular set of reasoning tasks sits relative to other people who took the same tasks. That distinction sounds pedantic until you see how often it is ignored — in marketing, in arguments, and in the way people talk about their own results.
The scale is built, not discovered
Modern scores use a deviation scale: the average is fixed at 100 and the standard deviation at 15. Those numbers are conventions. They were chosen so that scores spread out in a familiar, readable way, and so that roughly two thirds of people land between 85 and 115. Nothing in the brain corresponds to the number 100; it is the midpoint of a ruler somebody designed.
This is why comparing scores across different tests and different eras is treacherous. A score only means something in relation to the reference group it was scaled against. Change the group and the same performance produces a different number.
Percentiles say more than the score does
If your score is 115, the useful statement is not "115" but "around the 84th percentile" — roughly 84 out of 100 people in the reference sample scored lower. Percentiles also make the compression at the extremes visible. The gap between 100 and 110 covers a lot of people; the gap between 140 and 150 covers very few. Ten points is not always ten points.
Every score carries error
Testing is measurement, and measurement has error. Your attention, your sleep, your familiarity with the question formats and plain luck on a handful of items all move the number. Supervised clinical tests reduce that error; they do not eliminate it, which is why psychologists report confidence intervals rather than bare figures. Brain Rate reports a range for the same reason. A range of 108-122 is not vagueness — it is the honest version of a claim that a single number would overstate.
What a score is not for
- It is not a prediction of your career, income or worth.
- It is not fixed for life, and it is not a personality description.
- It is not a diagnosis. Learning differences and attention conditions need a clinician, not a test result.
- It is not evidence for any consequential decision — hiring, placement, legal or medical.
What it is good for is narrower and more interesting: a rough, honest read on how you handle certain kinds of abstract reasoning, and a profile showing where you are comparatively stronger and weaker. Read at that level, it is genuinely informative. Read as a verdict on a person, it is nonsense.