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US sizes are based on the imperial system, so ‘Letter’ size is 8.5 by 11 inches, whereas the equivalent A4 size in inches is 8.27 by 11.7 inches – not so easy to remember. Standard paper sizes in the US do not have a consistent aspect ratio, but were individually set.
If you want to enlarge an A4 page to fit on an A3 page the content will fit perfectly similarly if you want to copy some pages and save paper by copying several on each page you can copy exactly 2 or 4 of them per side without having to cut anything off or having any white stripes.
We'll break down the differences between A4 and Letter sizes, explain where and why they're used, and even introduce you to a nifty printer that can make your life a whole lot easier. So, if you're ready to unlock the secrets of paper sizes, let's dive right in!
A4 Paper Size is an international standard size of 210mm x 297mm, commonly used globally. Letter Paper Size is a North American standard size of 8.5 inches x 11 inches, widely used in the U.S. and Canada.
A4 paper is part of 'ISO 216-series' , while the Letter paper is a part of the old 'American National Standard Institute'. A4 is an internationally recognized paper size that measures 8.27 inches wide and 11.69 inches tall. All “A” sizes has an aspect ratio of 1: √ 2 (square root of 2).
If you're not sure what the difference is between A4 and Letter size paper, or how big a Semi B5 notebook is, start here. We explain how international paper sizes work and compare common A and B Series paper sizes to Letter size.
The difference between A4 and letter size documents might not seem particularly important at first – until the time comes to print something out and choose the right dimensions. Knowing how to differentiate between A4 vs Letter size can make all the difference to print quality.
To print or copy an A4 document on Letter, you should set the magnification factor to 94% since the Letter format is 6% less tall than A4. If you plan on printing a Letter document on A4, you should set the magnification factor to 97% since A4 is 3% less wide.
The international A4 paper size is 6mm (0.2") narrower and 18mm (0.7") longer than the US Letter paper size. Overall the area of the A4 is slightly bigger than that of Letter by 0.002 square metres (approx 0.002 square yards).
When comparing the A4 paper size vs. letter paper size, you'll find that the subtle differences in width and length as well as the locales where they're used differentiate the two. North American letter paper is 8.5 inches wide and 11 inches high.