Paper Weight Conversion Charts | In an effort to help eliminate the "Paper Weight" confusion problem,
we have compiled the comprehensive table listed below. Now you can compare various
types of paper and their "Equivalent Weights."
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.
Basis Weight ("Category") Table
| Type
of Paper |
Basic
Size |
"Bond"
Ledger
Mimeo
Duplicator
Rag Paper
|
17"
x 22" |
"Offset"
Book
Text
Coated Paper
|
25"
x 38" |
"Cover"
|
20"
x 26" |
"Tag
Stock"
|
24"
x 36" |
"Index"
|
25-1/2"
x 30-1/2" |
|
Paper Weights Table
| |
Bond
Ledger |
Offset
Text |
Cover |
Tag |
Index |
Points |
*Caliper
(inches) |
millimeters
|
Metric
(grams/sq meter) |
| Equivalent |
16 |
40 |
22 |
37 |
33 |
3.2 |
.0032 |
0.081 |
60.2
gsm |
| Weight |
18 |
45 |
24 |
41 |
37 |
3.6 |
.0036 |
0.092 |
67.72
gsm |
| |
20 |
50 |
28 |
46 |
42 |
3.8 |
.0038 |
0.097 |
75.2
gsm |
| |
24 |
60 |
33 |
56 |
50 |
4.8 |
.0048 |
0.12 |
90.3
gsm |
| |
28 |
70 |
39 |
64 |
58 |
5.8 |
.0058 |
0.147 |
105.35
gsm |
| |
29 |
73 |
40 |
62 |
60 |
6 |
.0060 |
0.152 |
109.11
gsm |
| |
31 |
81 |
45 |
73 |
66 |
6.1 |
.0061 |
0.155 |
116.63
gsm |
| |
35 |
90 |
48 |
80 |
74 |
6.2 |
.0062 |
0.157 |
131.68
gsm |
| |
36 |
90 |
50 |
82 |
75 |
6.8 |
.0068 |
0.173 |
135.45
gsm |
| |
39 |
100 |
54 |
90 |
81 |
7.2 |
.0072 |
0.183 |
146.73
gsm |
| |
40 |
100 |
56 |
93 |
83 |
7.3 |
.0073 |
0.185 |
150.5
gsm |
| |
43 |
110 |
60 |
100 |
90 |
7.4 |
.0074 |
0.188 |
161.78
gsm |
| |
44 |
110 |
61 |
102 |
92 |
7.6 |
.0076 |
0.193 |
165.55
gsm |
| |
47 |
120 |
65 |
108 |
97 |
8 |
.0078 |
0.198 |
176.83
gsm |
| |
53 |
135 |
74 |
122 |
110 |
9 |
.0085 |
0.216 |
199.41
gsm |
| |
54 |
137 |
75 |
125 |
113 |
9 |
.009 |
0.229 |
203.17
gsm |
| |
58 |
146 |
80 |
134 |
120 |
9.5 |
.0092 |
0.234 |
218.22
gsm |
| |
65 |
165 |
90 |
150 |
135 |
10 |
.0095 |
0.241 |
244.56
gsm |
| |
67 |
170 |
93 |
156 |
140 |
10.5 |
.010 |
0.25 |
252.08
gsm |
| |
72 |
183 |
100 |
166 |
150 |
11 |
.011 |
0.289 |
270.9
gsm |
| |
76 |
192 |
105 |
175 |
158 |
13 |
.013 |
0.33 |
285.95
gsm |
| |
82 |
208 |
114 |
189 |
170 |
14 |
.014 |
0.356 |
308.52
gsm |
|
87 |
220 |
120 |
200 |
180 |
15 |
.015 |
0.38 |
312
gsm |
| |
105 |
267 |
146 |
244 |
220 |
18 |
.0175 |
0.445 |
385.06
gsm |
|
The
Values in the table above are intended to serve as a guide only. They
should not be used as specifications because there are variances within
the same basis weight due to other characteristics of the papers. Similar
weight papers may vary between different paper manufacturers. |
The
darker colored boxes above represent the "most common paper weights" for
that category. |
Normal
paper manufacturing tolerance within a paper production run is + or -
5% to 7% caliper. |
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