Choosing the right size for a greeting card prevents awkward printing errors, unexpected postage surcharges, and costly layout adjustments. Whether you're designing custom stationery for an independent print shop, preparing personal holiday cards, or launching a boutique paper goods line, understanding exact measurements keeps your workflow efficient and your final product professional.
Standard greeting card dimensions depend heavily on mailing regulations, paper sheet yields, and industry conventions. Standardizing your sizes early saves time during the design and prepress phases, ensuring your layouts line up cleanly with commercial cutters and standard envelopes.
Standard Greeting Card Sizes
The stationery industry relies on several established dimensions. These sizes maximize sheet usage from standard commercial paper parent sheets while fitting cleanly into standard commercial envelope sizes.
A-Series and Standard Rectangular Sizes
The "A-Series" envelope and card system dictates most commercial greeting card sizes in North America. The designation system scales from small announcement sizes up to large greeting cards.
- A1 (3 1/2 x 4 7/8 inches): Commonly used for RSVP cards, small notes, or enclosure cards.
- A2 (4 3/8 x 5 3/4 inches): The most popular size for general greeting cards, thank-you notes, and RSVP cards. It fits inside an A2 envelope measuring 4 3/9 x 5 3/4 inches.
- A6 (4 3/4 x 6 1/2 inches): A popular mid-size format that gives you slightly more room than an A2 without feeling bulky. It pairs with an A6 envelope (4 3/4 x 6 1/2 inches).
- A7 (5 x 7 inches): The quintessential greeting card size for birthdays, holidays, and invitations. It offers ample space for imagery and text and pairs with an A7 envelope (5 1/4 x 7 1/4 inches).
- A9 (5 3/4 x 8 3/4 inches): Used for large event invitations, expansive photography cards, and fine art prints. It pairs with an A9 envelope (5 3/4 x 9 inches).
- A10 (6 x 9 1/2 inches): The largest standard A-size, frequently used for formal announcements and corporate holiday mailings.
Square and Specialty Sizes
Square cards offer a modern, high-end look, but they come with logistical caveats.
- 5 x 5 inches and 6 x 6 inches: Square formats stand out on retail racks because they break the rectangular mold. However, postal services often charge non-machinable surcharges for square mailpieces because they don't feed smoothly through automated sorting machines.
- Panel and Gatefold Cards: Custom folds require precise panel math. If you're designing a tri-fold card on an 8.5 x 11 inch sheet, panels cannot be equal width, or the inner flap won't tuck inside the outer panel cleanly. Typically, the inner folding panel is made 1/16 to 1/8 inch narrower than the cover panel.
Flat Size Versus Folded Size
A common beginner mistake is designing a folded card at the target size without accounting for the open layout. Every greeting card has two vital dimension metrics: the flat size and the folded size.
The folded size is the final physical dimension of the card as it sits on a shelf or arrives in the mail (for example, 5 x 7 inches). The flat size is the total area of the paper before folding and scoring.
For a standard side-fold or tent-fold A7 card (5 x 7 inches folded with a spine on the left or top), the flat size is 10 x 7 inches or 5 x 14 inches, respectively. You must build your design files at the flat size with a fold line clearly marked in your bleed layer.
Bleed, Trim, and Safe Zones
Print production requires a safety buffer because commercial cutters shift slightly during trimming. Ignoring prepress standards leads to white slivers on colored edges or chopped-off text.
- Trim Size: The final finished dimensions of your card after cutting (e.g., 5 x 7 inches).
- Bleed Area: Extend your background colors, patterns, and edge-to-edge images past the trim line by an extra 1/8 inch (0.125 inches) on all sides. For an A7 card, your file canvas size should be set to 5.25 x 7.25 inches.
- Safe Zone: Keep all essential text, borders, and critical artwork at least 1/4 inch (0.25 inches) inside the trim line. If the cutter shifts by a millimeter, text in the safe zone remains untouched.
Choosing Paper Weights and Thickness
Dimensions dictate your layout, but paper weight dictates how the card feels in the hand. A flimsy card cheapens the design, while overly thick paper cracks along the spine when folded.
Cardstock weight is measured in pounds (lb) for cover stock or grams per square meter (gsm).
- 80 lb Cover (approx. 216 gsm): A lightweight cardstock. It works for multi-panel accordion folds or heavy inserts, but it feels a bit thin for a standalone greeting card.
- 100 lb Cover (approx. 270 gsm): The industry sweet spot for standard greeting cards. It offers rigid structure, holds deep ink saturation, and folds cleanly when scored.
- 110 lb to 130 lb Cover (approx. 300 to 350+ gsm): Heavyweight luxury stock. Ideal for art prints, wedding invitations, and boutique stationery. Professional scoring is mandatory for stocks above 100 lb to prevent unsightly cracking along the fold line.
For more details on paper weights and formatting standards, you can review printing specifications provided by Moo or explore design resources on Adobe.
Postal Regulations and Postage Costs
Before you finalize your card dimensions and commit to a massive print run, check postal guidelines. Standard letter rates apply only if your mailpiece meets specific criteria.
In the United States, letters must be rectangular. Square cards, circular cards, or cards packaged in unusual shapes cannot be processed by high-speed sorting machines. The United States Postal Service applies a non-machinable surcharge for square envelopes, even if the weight is well under the standard one-ounce limit.
Furthermore, if your greeting card includes heavy embellishments like wax seals, thick ribbons, or dried flowers, the rigidity can push it into package territory, significantly increasing your postage costs. Always take a completed, assembled sample card to your local post office for weight and thickness verification before mailing a batch.
Frequently Asked Questions
What is the most popular greeting card size?
The A7 size (5 x 7 inches folded) is the most popular and widely manufactured greeting card size. It fits standard retail displays, provides plenty of visual space, and mails easily with standard first-class postage.
Do I need to include a bleed on greeting card designs?
Yes. Always add a 1/8-inch bleed to all sides of your flat card layout. Without a bleed, minor shifts during the cutting process can result in thin white lines framing the edges of your card.
Can I mail a square greeting card with standard postage?
While square cards fit within weight limits, they require non-machinable postage because automated postal sorting machines cannot process non-rectangular mailpieces reliably.
Should I score my cardstock before folding?
Any cardstock heavier than 80 lb cover stock should be mechanically scored before folding. Scoring compresses the paper fibers along the fold line, preventing the ink from cracking and giving the spine a crisp, professional fold.
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