Here you go Twillers:

You may wish to save this for reference.

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North American Standard Envelope Sizes.
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Commercial Sizes (in inches)

#5 3 1/16 x 5 1/2
#6 3 3/8 x 6
#6 1/4 3 1/2 x 6
#6 1/2 3 9/16 x 6 1/2
#6 3/4 3 5/8 x 6 1/2
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Official sizes (in inches)

#7 3 3/4 x 6 3/4
#7 1/2 3 3/4 x 7 5/8
#7 3/4 aka Monarch 3 7/8 x 7 1/2
#8 5/8 aka check 3 5/8 x 8 5/8
#9 aka Slimline 3 7/8 x 8 7/8
#10 4 1/8 x 9 1/2
#10 1/2 4 1/2 x 9 1/2
#11 4 1/2 x 10 3/8
#12 4 3/4 x 11
#14 5 x 11 1/2
#16 6 x 12
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Specialty Size (in inches)

A-1 3 5/8 x 5 1/8
A-2 4 3/8 x 5 3/4
A-6 4 3/4 x 6 1/2
A-7 5 1/4 x 7 1/4
A-7 3/4 3 7/8 x 7 1/2
A-8 5 1/2 x 8 1/8
A-9 5 3/4 x 8 3/4
9 1/2 9 x 12
A-10 6 x 9 1/2
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Booklet or Open Side size (in inches)

#3 4 3/4 x 6 1/2
#5 5 1/2 x 8 1/2
#6 5 3/4 x 8 7/8
#6 1/2 6 x 9
#7 6 1/4 x 9 5/8
#7 1/4 7 x 10
#8 8 x 11 1/8
#9 8 3/4 x 11 1/2
#10 9 1/2 x 12 5/8
#13 10 x 13
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(more sizes exist)

I hope that this is helpful to you.

Blair Stannard
2005 July 05