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What is a DL envelope? And what does DL stand for?.

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?.

While invitations can be any size you wish, a popular size for invitations is 5" x 7" which fits into a C7 size envelope.

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".