<P> Letter or ANSI Letter is a paper size commonly used as home or office stationery in the United States, Canada, Chile, Mexico, the Dominican Republic and the Philippines . It measures 8.5 by 11.0 inches (215.9 by 279.4 mm). US Letter size paper is a standard defined by the American National Standards Institute (ANSI, paper size A) in contrast to the A4 paper used by many other nations, adopted at varying dates, which is defined by the International Organization for Standardization (specifically, in ISO 216). </P> <P> Ronald Reagan made this the paper size for U.S. federal forms in the early 1980s; previously, the smaller "official" Government letter size, 8.0 by 10.5 inches (203 mm × 267 mm), was used in government, while standard 8.5 × 11 inch paper was used by most other offices . </P>

How big is a sheet of printer paper