Q.1004: What is A4 Sheet Size?, What is a4 size?, What is a4 paper size in inches?
As per ISO (International Standard Organization) A series cut sheet sizes, A4 is 297 mm long and 210 mm wide sheet. Equivalent size in inches is 11.69" long and 8.27" wide.
Nearest US size is Letter size which is 11.0" long and 8.5" wide written as 8.5x11.
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