Postal Specifications Chart

FIRST CLASS POSTCARDS	MINIMUM	MAXIMUM
Height	3.5"	4.25"
Length	5"	6"
Thickness	.007"	.016"
LETTERS (all classes)	MINIMUM	MAXIMUM
Height	3.5"	6.125"
Length	5"	11.5"
Thickness	.009"	.25"
AUTOMATION (Compatible Flat-Size Mail)	MINIMUM	MAXIMUM
Height	5"	12"
Length	6"	15"
Thickness	.009"	.75"

Envelope Size Guide

Commonly known envelope numbers and their dimensions:

ENVELOPE	SIZE		ENVELOPE	SIZE		ENVELOPE	SIZE
No. 6.25	3.5"x6"		No. 9	6.875"x8.875"		A-6	4.75"x6.5"
No. 6.75	3.625"x6.5"		No. 10	4.125"x9.5"		A-7	5.25"x7.25"
No. 7	3.75"x6.75"		No. 11	4.5"x10.375"		A-8	5.5"x8.125"
No. 7.75	3.875"x7.5"		No. 12	4.75"x11"		A-9	5.75"x8.75"
No. 8.625	3.625"x8.625"		No. 14	5"x11.5"		A-10	6"x9.5"

Go to the Current Postal Rates page, or
Go to the Request a Quote page, or
Go to the Place an Order page.