Chart: Visualising brightness

Download IQ chart (PDF – A4 printable)

This chart is also featured in the popular Australian book for gifted parents, Bright.

To cite this chart: Thompson, A. D. (2016). Bright: Seeing superstars, listening to their worlds, and moving out of the way. Life Architect.

Chronological & Mental Ages of Gifted Children

Download Mental Ages of Gifted Children chart (PDF – A4 printable)

To cite this chart: Thompson, A. D. (2019). Chronological & Mental Ages of Gifted Children. Life Architect.

IQ table (uses 15SD as in Wechsler)

Most numbers have been rounded to nearest significant figure.

IQ Percentile Top % 1 in…
200 99.999999998 0.000000002 76 billion
195 99.99999998 0.00000002 8.3 billion
190 99.999999901 0.000000099 1 billion
185 99.9999992 0.0000008 137 million
180 99.999995 0.000005 20.7 million
175 99.99997 0.00003 3.5 million
170 99.9998 0.0002 652,598
165 99.9992 0.0008 136,074
160 99.996 0.004 31,560
155 99.98 0.02 8,137
150 99.95 0.05 2,330
145 99.86 0.14 741
140 99.6 0.4 261
135 99 1 102
130 97.7 2.3 44
125 95.2 4.8 21
120 90.87 9.13 11

Convert confidence interval to index/score (Wechsler)

From the WISC-V technical report (August, 2015).

FSIQ Percentile
Rank
90%
Confidence
Interval
95%
Confidence
Interval
124 95 118-128 117-129
125 95 119-129 118-130
127 96 120-131 119-132
128 97 121-132 120-133
130 98 123-134 122-135
131 98 124-135 123-136
133 99 126-137 125-138
134 99 127-138 126-139
136 99 129-139 128-140
137 99 130-140 129-141
138 99 131-141 130-142
140 99.6 133-143 132-144
141 99.7 134-144 133-145
143 99.8 136-146 135-147
144 99.8 137-147 136-148
146 99.9 138-149 137-150
147 99.9 139-150 138-151
149 99.9 141-152 140-153
151 >99.9 143-154 142-155
153 >99.9 145-156 144-157
155 >99.9 147-157 146-158
FSIQ Percentile
Rank
90%
Confidence
Interval
95%
Confidence
Interval

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