Paper Weight Chart

Definitions

Basis Weight: The basis weight of a paper is the designated fixed weight of 500 sheets, measured in pounds, in that paper's basic sheet size. It is important to note that the "basic sheet size" is not the same for all types of paper.

Caliper: Caliper refers to the thickness of a sheet of paper expressed in thousandth of an inch. This measurement is taken with a micro meter.

Normally, paper caliper should not have more than a + or - 5% variance within a sheet. Generally, the relation between caliper and basis weight the greater the caliper (the thicker the paper), the greater the paper weight.

Equivalent Weight: While different paper types have different basic sizes, papers can still be compared by using equivalent weight.

Paper Conversion Chart
  Bond Ledger Offset Text Cover Tag Index Points *Caliper (Inches) Millimeters Metric (grams/sq meter)
Equivalent 16 40 22 37 33 3.2 0.0032 0.081 60.2 gsm
 Weight 18 45 24 41 37 3.6 0.0036 0.092 67.72 gsm
  20 50 28 46 42 3.8 0.0038 0.097 75.2 gsm
  24 60 33 56 50 4.8 0.0048 0.12 90.3 gsm
  28 70 39 64 58 5.8 0.0058 0.147 105.35 gsm
  29 73 40 62 60 6 0.006 0.152 109.11 gsm
  31 81 45 73 66 6.1 0.0061 0.155 116.63 gsm
  35 90 48 80 74 6.2 0.0062 0.157 131.68 gsm
  36 90 50 82 75 6.8 0.0068 0.173 135.45 gsm
  39 100 54 90 81 7.2 0.0072 0.183 146.73 gsm
  40 100 56 93 83 7.3 0.0073 0.185 150.5 gsm
  43 110 60 100 90 7.4 0.0074 0.188 161.78 gsm
  44 110 61 102 92 7.6 0.0076 0.193 165.55 gsm
  47 120 65 108 97 8 0.0078 0.198 176.83 gsm
  53 135 74 122 110 9 0.0085 0.216 199.41 gsm
  54 137 75 125 113 9 0.009 0.229 203.17 gsm
  58 146 80 134 120 9.5 0.0092 0.234 218.22 gsm
  65 165 90 150 135 10 0.0095 0.241 244.56 gsm
  67 170 93 156 140 10.5 0.01 0.25 252.08 gsm
  72 183 100 166 150 11 0.011 0.289 270.9 gsm
  76 192 105 175 158 13 0.013 0.33 285.95 gsm
  82 208 114 189 170 14 0.014 0.356 308.52 gsm
  87 220 120 200 180 15 0.015 0.38 312 gsm
  105 267 146 244 220 18 0.0175 0.445 385.06 gsm

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