IQ Guides
40 to 175

0 Quick Answer

Updated May 17, 2026 by Structural. The public ACIS IQ library keeps the score-range guides that matter most for interpretation: 40, 55, 70, 80, 90, 110, 120, 130, 135, 145, 160, and 175. It also includes a small set of guides written for specific scores that readers ask about most often: 81, 115, 125, and 158.

The structure follows the ACIS classification thresholds, because that is where the meaning of a score actually changes. What a reader normally needs is the label attached to the band, the percentile territory it covers, and the distance to the threshold above or below, since a difference of one or two points almost never survives the measurement error of a single administration.

Use the guides below as your starting point. If you need the wider scale first, start with the chart, percentile chart, or calculator, then come back for the band that matches the score you want to interpret. It also helps to know what an IQ test actually measures before reading any single number as a verdict.

1 Guides For Specific Scores

These four scores come up often enough on their own to deserve a dedicated explanation, usually because they sit close to a threshold and are easy to misread in either direction. Each page still routes back to the ACIS band that contains the score, so the exact number is never interpreted in isolation.

2 Lower Tail

3 Middle Range

4 Upper Tail

5 Why These Guides Are Organized By Band

These pages map directly to the public ACIS classification thresholds. That makes interpretation clearer because readers can see where a label starts, where it ends, what percentile territory it covers, and which threshold comes next.

Bands also match how precise a score really is. Every observed result carries measurement error, so the honest reading of any number is a small range around it rather than a fixed point, which is exactly what a classification band expresses. The reasons that uncertainty never disappears are set out under reliability and validity.

Most importantly, the structure reflects how scores are actually interpreted. Public readers rarely need a separate page for IQ 101 and IQ 102. They need to know whether a result sits in Average, High Average, Superior, or one of the gifted ranges, and how far from the next threshold it really is.

6 Core Guides And Tools