Envelope Sizes – A Quick Guide

The paper people use to mail friends and family is never standard. And because of this variety, the envelopes that protect the cards need to come in many different shape and sizes, too. 

To make sure you get the right envelope for your cards, we put together this extremely helpful (and short) envelopes guide.

Envelopes and Their Sizes

Type – A1 (Smallest Size You Can Purchase and Still Mail Through USPS)

Envelope Measures – H: 3 5/8 X  W: 5 1/8 Inches

Content Typically Placed Inside:

• Save-the-Date Magnets,
• Wedding RSVPs
• Thank You Notes 

Type – A2

Envelope Measures – H: 4 3/8 X W: 5 3/4 Inches

Content Typically Placed Inside:

• Save-the-Date Magnets
• Wedding RSVP
• Thank You Notes
• Invitations

Type – A6

Envelope Measures – H: 4 3/4 X W: 6 1/2 Inches

Content Typically Placed Inside:

• Invitations
• Greeting Cards
• Holiday Cards
• Birthday Cards
• Announcements
• Family Photos

Type – A7

Envelope Measures – H: 5 1/4 X W: 7 1/4 Inches

Content Typically Placed Inside:

• Invitations
• Greeting Cards
• Holiday Cards
• Birthday Cards
• Announcements
• Family Photos

Type – A8

Envelope Measures – H: 5 1/2 X W: 8 1/8 Inches

Content Typically Placed Inside:

• Invitations
• Greeting Cards
• Holiday Cards
• Birthday Cards
• Announcements

Type – A9

Envelope Measures – H: 8 3/4 X W: 5 3/4 Inches

Content Typically Placed Inside:

• Invitations
• Holiday Cards
• Birthday Cards