Envelope Sizes

C Series

The C series is used for postcards, folders and envelopes. Each C size envelope or folder will take the corresponding A size letter inside it without folding. For example, a C5 envelope is suitable for posting an A5 letter unfolded, or an A4 letter folded in half.

ISO International Standard Envelope Sizes

Size	Dimension	Takes letter…
C3	324 x 458	A3 unfolded
B4	250 x 353	A4 unfolded
C4	229 x 324	A4 unfolded
B5	176 x 250	A5 unfolded or A4 folded in half
C5	162 x 229	A5 unfolded or A4 folded in half
B6/C4	324 x 176	A4 folded in half lengthwise
B6	125 x 176	A6 unfolded or A5 folded in half
C6	114 x 162	A6 unfolded or A5 folded in half
DL	110 x 220	A4 folded in thirds
C7/6	81 x 162	A5 folded in thirds
C7	81 x 114	A7 unfolded or A6 folded in half

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Envelopes4u is a web based e-commerce company. We are a leading supplier of envelopes to companies specialising in the Wedding stationery and invitations market. A wide range of colours, sizes, finishes and textures are held in stock at our location in Brackley.

With our easy to use web site and online ordering system, Envelopes4u has become a premier source for the supply of Greeting Card Envelopes and Card blanks, Business Envelopes and Packaging Envelopes. Orders can be dispatched quickly and efficiently direct to our customers. Envelopes4u now stock a wide range of crafting materials including cardstock, adhesives, banners & crafting tools.