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Envelope FAQ

What are common envelope sizes?

Envelopes are available in many different sizes, and you can even have custom envelopes made. Each size is referred to by a number. The most common ones are:

#6 1/4 - 3 1/2" x 6"

#6 3/4 - 3 5/8 x 6 1/2"

#7 - 3 3/4" x 6 3/4"

#7 3/4 - 3 7/8" x 7 1/2"

#8 5/8 - 3 5/8" x 8 5/8"

#9 - 3 7/8" x 8 7/8"

#10 - 4 1/8"x 9 1/2"

#11 - 4 1/2" x 10 3/8"

#12 - 4 3/4" x 11"

#14 - 5" x 11 1/2"

Are colored envelopes available?

Yes, you can purchase colored envelopes in a variety of styles and sizes. Most office supply companies, along with specialty paper supply companies will carry them. We recommend you take a walk through your local Kelly Paper for a good selection.

What size envelope is most commonly used?

The No. 10, at 4-1/8" x 9-1/2" is the most common business envelope size, and fits standard 8-1/2" x 11" sheets of paper perfectly.

What is the size of the window on standard business envelopes?

Typically business envelopes will have a window that measures 4-1/2" x 1-1/8"

What guidelines should I follow for a custom envelope?


Following USPS guidelines, to be eligible for mailing at the postage rates for letters, a piece must be:

  • Rectangular
  • At least 3-1/2" high x 5" long x .007" thick
  • No more than 6-1/8" high x 11-1/2" long x 1/4" thick

    USPS Guidelines
 
 
 
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