| Size Conversion Paper and Board sizes A Series | Size | mm | inches | | 4A0 | 1682 x 2378 | 66.22 x 93.62 | | 2A0 | 1189 x 1682 | 46.81 x 66.22 | | A0 | 841 x 1189 | 33.11 x 46. 81 | | A1 | 594 x 841 | 23.39 x 33.11 | | A2 | 420 x 594 | 16.54 x 23.39 | | A3 | 297 x 420 | 11.69 x 16.54 | | A4 | 210 x 297 | 8.27 x 11.69 | | A5 | 148 x 210 | 5.83 x 8.27 | | A6 | 105 x 148 | 4.13 x 5.83 | | A7 | 74 x 105 | 2.91 x 4.13 | | A8 | 52 x 74 | 2.05 x 2.91 | | A9 | 37 x 52 | 1.46 x 2.05 | | A10 | 26 x 37 | 1.02 x 1.46 | | 6PPA4 | 340 x 640 | 13.39 x 25.20 | | 12PPA4 | 640 x 650 | 25.20 x 25.59 | B Series | Size | mm | inches | | B1 | 700 x 1000 | 27.56 x 39.37 | | B2 | 500 x 700 | 19.69 x 27.56 | | B3 | 350 x 500 | 13.78 x 19.69 | | B4 | 250 x 350 | 9.84 x 13.78 | RA Series | Size | mm | inches | | RA0 | 860 x 1220 | 33.86 x 48.03 | | RA1 | 610 x 860 | 24.02 x 33.86 | | RA2 | 430 x 610 | 16.93 x 24.02 | | RA3 | 305 x 430 | 12.01 x 16.93 | | RA4 | 215 x 305 | 8.46 x 12.01 | SRA Series | Size | mm | inches | | SRA0 | 900 x 1280 | 35.43 x 50.39 | | SRA1 | 640 x 900 | 25.20 x 35.43 | | SRA2 | 450 x 640 | 17.72 x 25.20 | | SRA3 | 320 x 450 | 12.60 x 17.72 | | SRA4 | 225 x 320 | 8.86 x 12.60 | Imperial Sizes | Size | mm | inches | | Quarto | 203 x 254 | 8 x 10 | | Foolscap | 203 x 330 | 8 x 13 | | American Quarto | 216 x 279 | 8.5 x 11 | | Large Post | 419 x 533 | 16.5 x 21 | | Double Cap | 432 x 686 | 17 x 27 | | Medium | 460 x 585 | 18.11 x 23.03 | | Royal | 508 x 635 | 20 x 25 | | Double Crown | 508 x 762 | 20 x 30 | | Postal | 571 x 724 | 22.5 x 28.5 | | Quad Crown | 762 x 1016 | 30 x 40 | | Quad Double Crown | 1016 x 1524 | 40 x 60 | Envelope sizes | Size | mm | | C6 | 114 x 162 | | DL | 110 x 220 | | Oversize DL | 114 x 232 | | C5 | 162 x 229 | | C4 | 229 x 324 | | C3 | 324 x 457 | | |
