Visualising brightness


IQ chart

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.


IQ mental age

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.


Calculate IQ mental age

years old
Score (e.g. 130)

Life Architect provides acceleration reports based on IQ test and mental age.


IQ percentile and rarity

IQ table (uses 15SD as in Wechsler)
Most numbers have been rounded to nearest significant figure.

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


Convert confidence interval to percentile and IQ score (Wechsler)

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

FSIQ Percentile
Rank
90%
Confidence
Interval
95%
Confidence
Interval
120 91 114-124 113-125
125 95 119-129 118-130
130 98 123-134 122-135
135 99 128-138 127-139
140 99.6 133-143 132-144
146 99.9 138-149 137-150
150 >99.9 142-153 141-154
155 >99.9 147-157 146-158
FSIQ Percentile
Rank
90%
Confidence
Interval
95%
Confidence
Interval

Show more detail for confidence interval to percentile and score

FSIQ Percentile
Rank
90%
Confidence
Interval
95%
Confidence
Interval
120 91 114-124 113-125
122 93 116-126 115-127
124 95 118-128 117-129
125 95 119-129 118-130
126 96 119-130 118-131
127 96 120-131 119-132
128 97 121-132 120-133
130 98 123-134 122-135
131 98 124-135 123-136
132 98 125-136 124-137
133 99 126-137 125-138
134 99 127-138 126-139
135 99 128-138 127-139
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
142 99.7 135-145 135-146
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
148 99.9 140-151 139-152
149 99.9 141-152 140-153
150 >99.9 142-153 141-154
151 >99.9 143-154 142-155
152 >99.9 144-155 143-156
153 >99.9 145-156 144-157
154 >99.9 146-157 145-158
155 >99.9 147-157 146-158
FSIQ Percentile
Rank
90%
Confidence
Interval
95%
Confidence
Interval