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Letter Size Envelope Dimensions In Cm. 4¼ inches by 5¼ inches: The dl business envelope size easily holds an a4 sheet of paper when folded parallel to its shorter sides into three equal sections.
The same size as a5 paper, the c5 envelope is another popular choice as it’s made to fit an a4 piece of paper folded in half lengthways. 8.66 inches x 4.33 inches: 3⁵⁄₈ inches by 4⁵⁄₈ inches (some say, by 5¹⁄₈ inches) 5 bar:
A standard c6 size envelope measures 114mm x 162mm.
When measuring dimensions, the longest side of the parcel is considered the length. In fact, a 5 x 7 envelope is slightly larger measuring 133 x 184 mm or 5.2 x 7.2 so that it can accommodate a 5 x 7 insert. Ideal for mailing greeting cards, regular letters and postcards, the maximum size that would fall under a 'letter' is 165 mm x 240 mm. Ie, the two shortest sides are used to calculate girth.