For easy reference, the following is a summary of the principal standard paper sizes and weights and their conversion equivalents using both the imperial and metric systems.

USA/British Metric
1 inch 2.54cm
1 foot 0.3048m
1 yard 0.9144m
USA size
Letter size 8.5" x 11"
Legal size 8.5" x 14"
Tabloid size 11" x 17"
A5 size 148mm x 210mm (5.83" x 8.27")
A4 size 210mm x 297mm (8.27" x 11.69")
A3 size 297mm x 420mm (11.69" x 16.54")
A2 size 420mm x 594mm (16.54" x 23.39")
USA International
Coated Stock (both sides gloss) Gloss Art Paper
lbs book unit caliper point gsm unit
53 2.4 79
57 2.8 85
64 3.2 95
71 3.5 105
76 3.9 113
86 4.3 128
95 4.5 140
106 5.1 157
Coated Stock (both sides matte) Matte Art Paper
lbs book unit caliper point gsm unit
53 3.0 79
57 3.3 85
64 3.9 95
71 4.3 105
76 4.5 113
86 6.5 128
95 8.3 140
Uncoated Book Paper Woodfree Art Paper
lbs book unit caliper point gsm unit
41 2.6 60
47 3.4 70
54 3.5 80
68 4.3 100
81 5.1 120
95 5.9 140
122 8.1 180
Gloss Coated Board Cover Art Board
lbs book unit caliper point gsm unit
70 8 190
78 10 210
85 11 230
96 12 260
115 15 310
Cast Coated 1-side board cover 1-side Art Board
lbs book unit caliper point gsm unit
82 9 220
93 10 250
100 12 270
111 13 300
122 15 330
Binding Board Binding Board
Ounces thickness gsm unit
20 1.5mm/ .06" 1000
24 2.0mm/ .08" 1200
32 2.5mm/ .10" 1450
40 3.0mm/ .12" 1750
48 3.5mm/ .14" 2150
USA Paper Size Metric System
type of stock in inches weight in lbs gsm unit
book: 25" x 38" 30 44
  40 59
  45 67
  50 74
  60 89
  70 104
  80 118
  90 133
  100 148
  120 178
cover: 20" x 26" 50 135
  60 162
  65 176
  80 216
  90 243
  100 270
  110 297
bond: 17" x 22" 13 49
  16 60
  20 75
  24 90
  28 105
  32 120
  36 135
  40 158
index card: 25.5" x 30.5" 90 163
  110 199
  140 254
  170 308
tag card: 24" x 36" 100 163
  125 203
  150 244
  175 285
  200 325
newsprint: 24" x 36" 32 52
bristol: 22.5" x 28.5" 57 125
  67 147
  80 175
  100 219
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