Paper weight definition in grams of a single one square International (ISO) system world

A Series Formats         B Series Formats            C Series Formats
4A0   = 1682 x 2378 – – – –
2A0   = 1189 x 1682 – – – –
A0     = 841 x 1189 B0 = 1000 x 1414              C0   = 917 x 1297
A1     = 594 x 841         B1 = 707 x 1000               C1   = 648 x 917
A2     =  420 x 594         B2 = 500 x 707                C2   = 458 x 648
A3     = 297 x 420         B3 = 353 x 500                C3   = 324 x 458
A4     = 210 x 297         B4 = 250 x 353                C4   = 229 x 324
A5     = 148 x 210         B5 = 176 x 250                C5   = 162 x 229
A6     = 105 x 148         B6 = 125 x 176               C6   = 114 x 162
A7     = 74 x 105          B7 = 88 x 125               C7   =  81 x 114
A8     = 52 x 74         B8 = 62 x 88                       C8   = 57 x 81
A9     = 37 x 52         B9 =  44 x 62                    C9   = 40 x 57
A10   = 26 x 37         B10 =31 x 44                   C10 = 28 x 40


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A Series Formats            B Series Formats C Series Formats
4A0 = 66 1/4 x 93 5/8 – – – –
2A0 = 46 3/4 x 66 1/4 – – – –
A0   = 33 x 46 3/4 B0   = 39 3/8 x 55 3/4            C0   = 36 x 51
A1   = 23 3/8 x 33 B1   = 27 3/4 x 39 3/8            C1   = 25  1/2 x 36
A2   = 16 1/2 x 23 3/8 B2   = 19 3/4 x 27 3/4    C2   = 18 x 25  1/2
A3   = 11 3/4 x 16 1/2 B3   = 13 7/8 x 19 3/4    C3   = 12  3/4 x 18(A3 Extra )
A4   = 8 1/4 x 11 3/4 B4   = 9 7/8 x 13 7/8    C4   = 9 x 12  3/4
A5   = 5  7/8 x 8  1/4 B5   = 7 x 9 7/8             C5   = 6  3/8 x 9
A6   = 4  1/8 x 5  7/8 B6   = 4 7/8 x 7              C6   = 4  1/2 x 6  3/8
A7   = 2  7/8 x 4  1/8 B7   = 3 1/2 x 4 7/8              C7   = 3  3/16 x 4  1/2
A8   = 2 x 2  7/8 B8   = 2 1/2 x 3 1/2              C8   = 2  1/4 x 3  3/16
A9   = 1  1/2 x 2 B9   = 1 3/4 x 2 1/2             C9   = 1  5/8 x 2  1/4
A10 = 1 x 1  1/2 B10 = 1 1/4 x 1 3/4              C10 = 1  1/8 x 1  5/8
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Paper Weight
System                                   Paper weight definition Where it is used
International (ISO) system        The weight in grams of a single one square Most of the world
                                                  meter sheet of paper. The units are grams
                                                      per square meter (g/m2)
US (lb) system The weight of 500 17" x 22" sheets of USA
paper. The units are pounds (lb).* Japan
Japan (kg) system The weight in kilograms of 1000 788 mm x
1091 mm sheets of paper. The units are
kilograms (Kg).
*This applies to Bond paper only. See the discussion of US paper weights below.
Since the paper weights are defined differently, you cannot convert directly between them. The
conversion factors are as follows:

lb  GO g/m2 [x 3.760] g/m2  GO Kg [x 0.860 ] Kg  GO g/m2 [x 1.163]
lb  GO Kg [x 3.233] g/m2  GO  lb  [x 0.266 ] Kg  GO  lb  [x 0.309]




ปอนด์ น้ำหนัก  (lbs)  หาร  / 2.2   =     kg
#######################       g/m2  คือ g / m กำลัง 2     ############################