Your Guide to Standard Card & Envelope Sizes (A Sizes)
When designing or purchasing stationery, understanding standard card and envelope sizes is essential for ensuring your creations fit beautifully and arrive safely. One of the most commonly used sizing systems is the “A” series, which offers versatile options for various stationery needs.
Here’s a quick breakdown of popular A sizes and their best uses.
Standard Card & Envelope Sizes
| Size | Card Measurements | Envelope Measurements |
|---|---|---|
| A1 | 3 1/2 x 4 7/8 | 3 5/8 x 5 1/8 |
| A2 | 4 1/4 x 5 1/2 | 4 3/8 x 5 3/4 |
| A6 | 4 1/2 x 6 1/4 | 4 3/4 x 6 1/2 |
| A7 | 5 1/8 x 7 | 5 1/4 x 7 1/4 |
| A7.5 | 5 3/8 x 7 1/4 | 5 1/2 x 7 1/2 |
| A8 | 5 1/4 x 7 7/8 (Cards not stocked*) | 5 1/2 x 8 1/8 |
| A9 | 5 1/2 x 8 1/2 | 5 3/4 x 8 3/4 |
| A10 | 5 3/4 x 9 1/4 (Cards not stocked*) | 6 x 9 1/2 |
*Cards of this size are not stocked. Use our cutting and scoring services to custom order.
Sizing Key
| 1/2 = 0.5 | 1/4 – 0.25 | 3/4 – 0.75 | 1/8 = 0.125 | 3/8 = 0.375 | 5/8 = 0.625 | 7/8 = 0.875 |
|---|
A1 Envelopes: Compact and Stylish for RSVP & Note Cards
Also known as the 4Bar size, A1 is perfect for thank-you cards, RSVP cards, and small notes. Its compact size makes it ideal for those moments when a brief but heartfelt message is all you need. Check out our collection of A1 cards and shop hundreds of styles.
A2 Envelopes: Perfect for Detail & Response Cards
Slightly larger than A1, A2 cards are commonly used for greeting cards and invitations. This size provides enough space for designs and text while still being small enough to maintain an intimate feel.
A6 Envelopes: Ideal for Save the Dates and Small Invites
The A6 size offers a bit more room, making it a go-to choice for photo cards, postcards, or detailed event invitations. A6 cards fits neatly into these envelopes and is a favorite for showcasing visuals or longer messages. If you have a 4×6 card or invitation we recommend using A6 envelopes.
A7 Envelopes: The Go-To Size for 5×7 Invitations
A7 is one of the most popular sizes for wedding invitations, announcements, and holiday cards and is designed to fit A7 cards perfectly. Its proportions balance elegance with practicality, giving you enough canvas space for creative designs without overwhelming the recipient. They are the perfect envelopes for your 5×7 invites and cards.
A7.5 Envelopes: Spacious Fit for Layered 5×7 Cards
A7.5 envelopes are slightly larger than standard A7 envelopes and are often used when you want a looser fit or to accommodate embellished or layered card designs, such as deckle-edged or layered arch cards. They also are the ideally envelopes for A7.5 cards.
A8 Envelopes: Versatile for 5×8 Invitations and More
Not too big, not too small, 5 1/2 x 8 1/8 A8 invitation envelopes are just the right size for invitations of all sorts! They’re perfect for business endeavors, invitations, promotional flyers and so much more. These envelopes will accommodate all your 5 3/8 x 7 3/4 cards.
A9 Envelopes: Oversized Elegance for Formal Invitations
A9 envelopes are designed to hold A9 cards, which are excellent for oversized greeting cards or programs. The additional size adds a sense of formality, perfect for grand occasions.
A10 Envelopes: Professional Solutions for Business Mailings
A10 cards and envelopes are ideal for larger, impactful designs. This size is commonly used for corporate presentations, event programs, or unique stationery that requires extra space.
Matching Cards to Envelopes
To ensure your cards fit perfectly, match them with the corresponding envelope size. For example, A1 cards should pair with A1 envelopes. Also, consider texture and color—luxury finishes like cotton rag or felt paper can elevate the overall look.
Why Standard Sizes Matter
Using standard sizes ensures compatibility with postal regulations and makes it easier to find envelopes and accessories to complement your stationery. It also helps keep production costs manageable, especially for custom designs.
Whether you’re creating wedding invitations, sending a heartfelt note, or designing a stunning card collection, the “A” sizes offer a perfect solution for every occasion. With the right paper, design, and finish, your stationery is sure to stand out!
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Envelopes for 5×7 Cards | How to Find the Right Size Envelope | Cardstock Sizes