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 ############################
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