Letter Paper Size Dimensions. Hence, ansi paper sizes are based around the letter size of dimensions 8.5 in × 11 in. Letter size paper is 8.5 x 11 inches (215.9 x 279.4 mm), whereas a4 size paper is 8.3 x 11.7 inches (210 x 297 mm).
Part of the ansi standard 72 dpi is standard for the web, but 300 dpi is standard for print. In postscript, its dimensions are 612 × 792 points.
All us series paper sizes.
The dimensions of the other a paper sizes in pixels vary between these largest and smallest sizes. The letter format is comparable to the iso a4 format in as much as it is widely used for business and academic needs, but the sizes do differ. 72 dpi is standard for the web, but 300 dpi is standard for print. The iso 216 standard, which includes the commonly used a4 size, is the international standard for paper size.