Commercial Envelopes

Also called business, standard, or officials, these are open side envelopes usually with commercial style flaps and diagonal seams although some sizes come with side seams and square or pointed flaps. The Monarch is a variation of the #7 ¾ envelope but with pointed flap. The window version has single or double windows that allow addresses to show through the face of the envelope. They are normally used for invoices or billing statements, paychecks and receipts.

The following list shows the name/number designation, envelope dimensions, and approximate maximum enclosure dimensions for some of the more common sizes of this envelope style. Actual dimensions for enclosures will depend on the thickness of the enclosure (paper thickness, number of pages).

#5
5.5 x 3.0625
5.25 x 2.8125

#6
6 x 3.375
5.75 x 3.125

#6 ¼
6 x 3.5
5.75 x 3.25

#6 ½
6.25 x 3.5625
6 x 3.3125

#6 ¾
6.5 x 3.625
6.25 x 3.5

#7
6.75 x 3.75
6.5 x 3.5

#7 ½
7.625 x 3.75
7.375 x 3.5

#7 ¾ & Monarch
7.5 x 3.875
7.25 x 3.75

Check
8.625 x 3.625
8.375 x 3.5

#9
8.875 x 3.875
8.625 x 3.75

#10
9.5 x 4.125
9.25 x 3.875

#10 ½
9.5 x 4.5
9.25 x 4.25

#11
10.375 x 4.5
10.125 x 4.25

#12
11 x 4.75
10.75 x 4.5

#14
11.5 x 5
11.25 x 4.75

#16
12 x 6
11.75 x 5.75

All measurements in inches: .125 = 1/8 | .25 = 1/4 | .375 = 3/8 | .5 = 1/2 | .625 = 5/8 | .875 = 7/8
These envelope sizes apply specifically to the United States. Standard International envelope sizes differ.