how big is ansi a
Everything You Need To Know About Paper. In 1995 the American National Standards Institute (ANSI) adopted ANSI/ASME Y14.1, which defines paper sizes based upon the de facto standard âUS Letterâ size (8.5âx 11â or 216mm x 279mm) which is called âANSI Aâ, the already existing âUS Ledger/Tabloidâ size was also included in the series as âANSI Bâ.