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Standard sizes of envelopes

Postage costs are important to determine the price of your mailing. Consult the website of your local postal service to account for regulations and limitations regarding e.g., size and shape.

Code	Dimensions (mm)	What fits in it?	Remark
E4	280 x 400	2.1.1.1.1.1.5 sheet of B4	international format
EA4	220 x 312	A4 sheet	NL format
EA 5	156 x 220	A4 dubble folded → A5	NL format
B4	250 x 353	C4 pocket	older Belgian format
	175 x 265	Pocket / A4 dubble folded
B5	176 x 250	Pocket / A4 double folded
	160 x 240	Pocket / A4 double folded	Belgian format
B6	125 x 176	C6 envelope	German format
C3	324 x 458	A3 sheet	unusual format
	230 x 310	A4 sheet	Belgian format
C4	229 x 324	A4 sheet	international format
C5	162 x 229	A4 double folded → A5	international format
C5/6	114 x 229	A4 'long' folded → one third A4	so called US size
DL	110 x 220	A4 folded in 3 → one third A4	DIN Long
C6	114 x 162	A4 4x folded → A6	international format
reply env	107 x 215	A4 'long' folded	long reply envelope
reply env	110 x 156	A4 4x folded	small reply envelope
	90 x 140	small greeting card	envelope with a diamond flap

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