Paper Sizes: DIN B Series (ISO 216:1975)

The DIN B series (ISO 216:1975) includes the following formats:

DIN B0 1000 x 1414 mm Quadruple sheet
DIN B1 707 x 1000 mm Double sheet
DIN B2 500 x 707 mm Sheet
DIN B3 353 x 500 mm Half sheet
DIN B4 250 x 353 mm Quarter sheet (note paper)
DIN B5 176 x 250 mm Eighth sheet (page)
DIN B6 125 x 176 mm Half page
DIN B7 88 x 125 mm Quarter page (postcard)
DIN B8 62 x 88 mm Eigtht page
DIN B9 44 x 62 mm

The aspect ratio is √2 : 1. It starts with the DIN B0 paper size, which measures 1000 x 1414 mm.

From the base format of this DIN standard, the next smaller sizes are calculated with the formula width : height = √2 : 1.