If you’re sending a 4×6 card through the mail, you’ll need to use a standard envelope size. Here’s a quick guide to finding the right envelope for your card.
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Standard Envelope Sizes
The standard envelope sizes are:
4″ x 6″ – This is the most common size for greeting cards, thank you cards, and invitations.
5″ x 7″ – This size is commonly used for invitations.
6″ x 9″ – This size envelope can be used for both invitations and marketing materials.
9″ x 12″ – This size envelope is commonly used for marketing materials.
10″ x 13″ – This size envelope is commonly used for marketing materials.
12″ x 18″ – This size envelope is commonly used for posters and large prints.
Envelopes for 4×6 Cards
Envelopes for 4×6 cards come in a variety of sizes. The most common sizes are A6 and A7. A6 envelopes are the perfect size for 4×6 cards. They are also a good size for invitations and announcements. A7 envelopes are slightly larger than A6 envelopes and can hold 4×6 cards with a little extra room.
A2 envelopes are the most common size for sending 4×6 cards. They are also known as an invitation-sized envelope because they are commonly used for wedding invitations and other formal invitations. The standard size for A2 envelopes is 4 3/8 x 5 3/4 inches.
The A6 size envelope is the most common size for enclosing 4×6 cards. It fits a card that is 4-1/4″ x 6-1/4″. Here are some popular uses for A6 envelopes:
-Invitations (RSVP cards, Save the Date, etc)
-Thank you cards
Custom Envelope Sizes
Most envelopes used for greeting cards and invitations are standard sizes. However, you may occasionally need a custom envelope for a special project. Here are some common envelope sizes and their dimensions:
-A2: 4.375″ x 5.75″
-A6: 4.75″ x 6.5″
-A7: 5.25″ x 7.25″
-A8: 5.5″ x 8.125″
To find the perfect envelope for your card, simply measure the card and add a half inch to each side for the flap. For example, a 4×6 card would require an envelope that is at least 4.5 inches wide and 6.5 inches tall.
Envelope Size Chart
The table below shows the minimum and maximum dimensions (length and width) in inches and millimeters of envelopes accepted by the USPS, as well as the preferred orientation of each envelope.
| Envelope Type | Minimum Length (in) | Minimum Width (in) | Maximum Length (in) | Maximum Width (in) | Preferred Orientation |
| ————————————————- | —————– | —————– | ——————- | ——————- | ——————— |
| 3.5″ x 5″ greeting card envelope | 3.5 | 5 | 3.75 | 5.25 | Portrait |
| 4″ x 6″ greeting card envelope | 4 | 6 || 6.125 || Portrait