Envelope sizes

Basic information

Size markings Dimensions of sides    Standard paper sizes  
E-series C-series B-series mm   A-series mm
  C3   324 x 458   A0 841 x 1189
    B4 250 x 353   A1 594 x 841
C4 229 x 324   A2 420 x 594
E4 215 x 307   A3 297 x 420
B5 176 x 250   A4 210 x 297
C5 162 x 229   A5 148 x 210
C65 114 x 229   A6 105 x 148
E5 156 x 220      
E65 110 x 220      
B6 125 x 176      
C6 114 x 162      
E6 110 x 156      

The sizes in bold are suitable for mechanical sorting.