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As per ISO (International Standard Organization) A series cut sheet sizes, A4 is 297 mm long and 210 mm wide sheet written as 210x297 mm.
A4 size in cm; 29.7 long and 21.0 wide written as 29.7x21 cm
A4 size in inches is 11.69" long and 8.27" wide or 8.3x11.7. or 8 5/16 x 11 11/16 inch
Nearest US size is Letter size which is 11.0" long and 8.5" wide written as 8.5x11 or 8 1/2x11
Nearest Traditional British size is Quarto which is 8.0" wide and 10" long written as 8x10.
For all ISO and US sizes, click here