measurements for standard envelope sizes

Therefore the number increases as it relates to the number of folds. For example, A2 paper is A0 folded twice, A3 paper is A0 folded 3 times, A4 paper is A0 folded 4 times.

The number next to the A specifies the number of folds in half needed from an A0. The ISO standard paper sizing system works by using A0 size paper as the base point and largest size.

This is because envelope sizing is based on the ISO paper size system, so a C5 envelope is designed to fit A5 paper and a C4 envelope is designed to fit A4 paper. Why do the 'C' numbers increase as the envelope sizes decrease? (e.g C4 is bigger than C5).For example if you calculate the geometric mean of A4 and B4 paper this will give you the dimensions of a C4 envelope (which is the ideal size to hold an A4 sheet of paper unfolded). This calculation produces a size between the A and B dimensions to make an envelope to perfectly hold the A size paper. C envelope size is the geometric mean of the A and B size of the same number. What does the letter C mean in terms of envelope sizing?.What size envelope do I need for an A4 brochure?Īn A4 paper or brochure (depending on the thickness of the brochure) will fit into a C4 size envelope, without having to hold the paper to fit.For example, if you want an envelope to fit an A4 sheet of paper, then you'll need a C4 envelope (and so on). Is there an easy way to work out which size envelope I need?Ī quick and easy way to remember which envelope size you need is to swap the 'A' letter of your paper size for the letter 'C'.V (V-Bottom) or W (Box Bottom).Īlso see our tips on how to measure a block size. Fourth - determine the envelopes 'bottom' shape.This is sometimes referred to as the Gusset. That is the thickness that the envelope expands to. Third - determine the 'depth' of the expansion.When an envelope opens on the longest side it is called a booklet envelope or an open side envelope. The length is always the longer measurement without including the flap. Second - determine the 'length' of the envelope.When an envelope opens on the shortest side it is called a catalog envelope or an open end envelope. The width is always the shorter measurement. First - determine the 'width' of the envelope.If you need help with your envelope artwork, please contact customer service. These templates should be used for window reference only and should not be used for creating and sending envelope artwork. If you would like to view and download window templates, please visit our templates page. Window positions are always measured by their distance from the left edge of the envelope and the distance from the bottom (the flap is the 'top' of the envelope). Window size is always specified as height x width regardless of orientation. You can find a helpful list of standard envelope sizes here. Simply considering the position of the flap is the first step in describing envelopes. The dimension from the left to right is the width. Therefore, if the envelope is placed before you with its seal flap at the top, the dimension from the bottom fold to the top fold is the height. Although envelopes are measured from the shortest dimension first, this practice does not distinguish the height from the width.

Measurements for standard envelope sizes