Common Card Sizes Explained: A Beginner’s Guide for Cardmakers

Choosing the right card size can make a handmade design easier to plan, assemble, and mail. Some images fit naturally on a standard A2 card, while tall flowers, repeating patterns, interactive elements, or detailed scenes may benefit from a slimline, 5 x 7, square, or shaped format.

This beginner’s guide compares common card sizes used in the United States, United Kingdom, Europe, and other international markets. You’ll learn the finished dimensions for each format, the cardstock measurements needed to create the folded base, and which types of designs work particularly well on each one. We’ll also compare US A2 and international A6 cards, explain top-folding and side-folding orientations, and share practical considerations for envelopes, postage, matting, and layering.

Hello there, and welcome back to the Beginner’s Guide to Cardmaking Series! It’s Lisa Tilson here with you again, and today we are talking about common card sizes.

These are the go-to formats that feature regularly in cardmaking projects. We touched on this topic briefly in our previous article about how to make a handmade card, but it is worth exploring in more detail. The size and shape of a card can help bring the entire design to life.

Beginner Guide Snapshot

Project Details	A beginner’s comparison of popular US and international handmade card sizes, shapes, orientations, and cardstock measurements
Skill Level	Beginner
Approximate Time	No set time - this is an educational reference guide
Project Type	Evergreen cardmaking size guide
Techniques	Measuring, trimming, scoring, folding, orientation planning, matting, layering, and shaped-card construction
Occasion	All occasions
Finished Size	Varies - includes A2, A6, US 5 x 7, slimline, mini slimline, square, and shaped cards
Featured Products	Spellbinders ColorWheel Cardstock, nesting dies, a paper trimmer, scoring tools, and coordinating envelopes

What You’ll Need

Spellbinders Products

• Spellbinders Cardstock and Paper
• Guillotine Paper Trimmer
• Nesting and Layering Dies - optional
• Platinum SIX Die Cutting Machine - optional for shaped cards and nesting layers
• Cardmaking Adhesives

Other Basic Supplies

• Ruler
• Scoring board or scoring tool
• Bone folder
• Pencil and eraser
• Envelopes that coordinate with the finished card size
• Postal scale - optional when mailing dimensional cards

Common Card Sizes at a Glance

Card Format	Finished Size	Cardstock Before Folding	Score Line
US A2 Vertical Top Fold	4.25 x 5.5 inches	4.25 x 11 inches	5.5 inches
US A2 Horizontal Top Fold	5.5 x 4.25 inches	8.5 x 5.5 inches	4.25 inches
US 5 x 7 Card	5 x 7 inches	7 x 10 inches	5 inches
Slimline	3.5 x 8.5 inches	7 x 8.5 inches	3.5 inches
Mini Slimline	3.5 x 6.5 inches	7 x 6.5 inches	3.5 inches
4.25-Inch Square	4.25 x 4.25 inches	4.25 x 8.5 inches	4.25 inches
4-Inch Square	4 x 4 inches	4 x 8 inches	4 inches
International A6	Approximately 4.13 x 5.83 inches	A5 sheet - approximately 5.83 x 8.27 inches	Approximately 4.13 inches

Please note: The term “A7” is often used by US cardmakers and invitation suppliers for a 5 x 7-inch card or its coordinating envelope. This should not be confused with the much smaller ISO A7 international paper size.

Why Does Card Size Matter?

The card size affects the scale, proportions, amount of open space, and overall impact of the design. Before cutting the card base, consider the following questions.

Which Size Best Supports the Design?

Some layouts look balanced on a standard A2 card but feel empty or undersized on a larger panel. Other projects include tall, wide, or interactive elements that need more room.

Which Shape Works Best?

Consider whether the design would look better on a rectangle, square, circle, arch, oval, or another shaped base. The outline of the card can reinforce the focal image rather than simply holding it.

Which Size Feels Comfortable?

A small panel may feel less intimidating when you want to focus on fine details. A larger panel can provide more freedom for scene building, large images, or expressive arrangements. Neither approach is better - choose the scale that feels comfortable.

Will You Be Mass-Producing the Design?

Card size matters when creating a large batch of invitations, holiday cards, or thank-you notes. Smaller formats may use less cardstock and require fewer decorative elements, while standard sizes can simplify cutting and envelope selection.

Are the Products Proportional?

Check the approximate measurements of the stamps, dies, stencils, and sentiments before choosing the card base. A large focal die may overwhelm a small square card, while a tiny stamped image can feel lost on a 5 x 7-inch panel unless it is repeated or framed.

Do You Have a Coordinating Envelope?

Confirm the envelope size before beginning, particularly when creating square, shaped, or unusually dimensional cards. You can also make a custom envelope, but it should be planned as part of the project.

Will Postage Affect the Decision?

Postage requirements vary by country and can depend on the card’s length, width, thickness, weight, shape, and rigidity. Check the current requirements of your postal service before mailing an unusual or dimensional format.

Common US Card Sizes

US A2 Cards

The A2 is one of the most commonly used formats among US cardmakers. Its finished dimensions are 4.25 x 5.5 inches.

How to Make a Vertical Top-Folding A2 Card

Trim the cardstock to 4.25 x 11 inches. Score and fold it at 5.5 inches. The fold will sit across the top of the vertical card.

How to Make a Horizontal Top-Folding A2 Card

Trim the cardstock to 8.5 x 5.5 inches. Score and fold it at 4.25 inches. The fold will sit across the top of the horizontal card.

The examples above demonstrate how similar design elements can work in different orientations. The shape and direction of the focal image often help determine whether the card should be vertical or horizontal.

How to Make Side-Folding A2 Cards

The same cardstock measurements can create side-folding cards:

• For a vertical side-folding card, cut the cardstock to 8.5 x 5.5 inches and score it at 4.25 inches.
• For a horizontal side-folding card, cut the cardstock to 11 x 4.25 inches and score it at 5.5 inches.

Rotating the card base changes the position of the fold without changing the finished A2 dimensions.

When to Choose an A2 Card

An A2 format works well for:

• Everyday greeting cards
• Birthdays and thank-you cards
• Stamped or die-cut focal images
• Embossed backgrounds
• BetterPress and hot-foiled panels
• Cards being created in larger quantities
• Designs intended for standard A2 envelopes

US 5 x 7 Cards

The larger 5 x 7-inch format is often used for invitations, interactive projects, larger stamped images, and special-occasion cards.

To create a top-folding 5 x 7-inch card, trim the cardstock to 7 x 10 inches and score it at 5 inches.

In the example above, the card size was determined by the die set. The cuckoo-cottage pendulums were designed to swing freely. The set could have been used on an A2 card, but the pendulums would have needed to be shortened.

The larger format provides additional room for interactive parts and allows bigger dies, stamped images, stencils, and sentiments to remain in proportion.

When to Choose a 5 x 7 Card

• Large focal images
• Interactive and kinetic designs
• Wedding and party invitations
• Milestone celebrations
• Detailed scenes
• Designs with several sentiments or decorative elements

Slimline and Mini Slimline Cards

Slimline and mini slimline cards have an elongated shape that works particularly well for repeated images, tall florals, panoramic scenes, borders, and arrangements with several small focal elements.

How to Make a Slimline Card

A slimline card measures 3.5 x 8.5 inches when folded. Trim the cardstock to 7 x 8.5 inches and score it at 3.5 inches.

The example below was created with a slimline die, allowing the design to fill the entire card from left to right and top to bottom.

How to Make a Mini Slimline Card

A mini slimline card measures 3.5 x 6.5 inches when folded. Trim the cardstock to 7 x 6.5 inches and score it at 3.5 inches.

Mini slimline cards offer the visual appeal of an elongated design in a more compact format. The two examples below rely heavily on repeating elements across the card fronts.

When to Choose a Slimline Format

• Repeated images in several colors
• Long-stemmed flowers
• Rows of characters or sentiments
• Layered clouds and mountain ranges
• Panoramic scenes
• Alphabet or number designs
• Long borders and background patterns

Square Cards

Square cards can be made in many sizes. Common finished measurements range from 3.5 x 3.5 inches to 6 x 6 inches, often increasing in half-inch increments. You can also create a custom square format to fit a particular design.

The cards shown below measure:

• 4.25 x 4.25 inches - cut the cardstock to 4.25 x 8.5 inches and score it at 4.25 inches.
• 4 x 4 inches - cut the cardstock to 4 x 8 inches and score it at 4 inches.

Square cards work well for centered arrangements, wreaths, circular focal points, compact scenes, and symmetrical designs.

Mailing Tip: Square envelopes may be handled differently from standard rectangular envelopes by some postal services. Check current size and postage requirements before preparing a large batch.

Shaped Cards

A shaped card uses an outline other than a standard rectangle or square. Circles, arches, ovals, florals, ornaments, and other silhouettes can all become card bases.

Nesting dies designed for A2 cardmaking are typically sized so the largest die fits within a 4.25 x 5.5-inch rectangle. This lets you use the die as a decorative layer on an A2 card or transform it into a shaped card base.

The arch-shaped card on the left complements the curved tops of the tulips and daffodils. On the right, the oval shape closely frames the foiled and colored flowers, leaving only a small amount of open space on either side.

How to Make a Shaped Card with a Nesting Die

1. Fold a piece of heavyweight cardstock to create a card base.
2. Position the nesting die so a small portion extends beyond the folded edge.
3. Secure the die with low-tack tape.
4. Run the cardstock and die through a compatible die-cutting machine.
5. Leave the folded edge uncut so the shaped front and back remain connected.
6. Add a complete die-cut shape over the front if you want to conceal the flattened folded edge.

Common UK, European, and International Card Sizes

Many countries use the ISO 216 international paper-size standard. A6 is one of the most common finished card sizes in the United Kingdom, Europe, and other international markets.

International A6 Cards

An A6 card measures approximately 4.13 x 5.83 inches, or 105 x 148 millimeters, when folded.

An A4 sheet measures approximately 8.27 x 11.69 inches, or 210 x 297 millimeters. It can be used to create:

• Two folded A6 card bases
• Four A6 card panels
• One folded A6 card base and two A6 card panels

Spellbinders ColorWheel Cardstock is also available in an A4 format, making it suitable for cardmakers who regularly create A6 projects.

The examples above were created on A6 card bases, with one horizontal design and one vertical design. The elements were originally used on US A2 cards and then rearranged for the international A6 format.

This demonstrates that products designed by US manufacturers can work on international sizes, and vice versa. You may need to adjust the spacing, crop a background, reposition the sentiment, or simplify the arrangement, but the supplies are not restricted to one card format.

US A2 vs. International A6 Cards

Feature	US A2	International A6
Finished Size	4.25 x 5.5 inches	Approximately 4.13 x 5.83 inches
Proportion	Slightly wider and shorter	Slightly narrower and taller
Common Parent Sheet	8.5 x 11 inches	A4 - approximately 8.27 x 11.69 inches
Panels per Full Sheet	Four	Four
Card Bases per Full Sheet	Two	Two

The difference between the two formats is relatively small, but the proportions can affect the placement of borders, frames, full-panel dies, and backgrounds. Before cutting, compare the product measurements with the intended card base.

Matting and Layering Different Card Sizes

Nesting and layering dies can create evenly spaced borders on many card formats. When a coordinating die is unavailable, use a paper trimmer to cut the layers manually.

For a narrow border, trim the decorative panel slightly smaller than the card base. For example, reducing both the width and height by 0.25 inches creates an approximately 0.125-inch border on all four sides when the panel is centered.

You can continue reducing each layer by the same amount to create multiple evenly spaced mats. Alternatively, vary the borders to create a more modern or asymmetrical look.

How to Choose the Best Card Size

Step 1 - Measure the Main Product

Check the approximate size of the largest die, stamp, stencil, sentiment, or focal image. This quickly eliminates formats that are too small.

Step 2 - Arrange the Elements Before Cutting

Place the dies, stamps, or finished elements over scrap paper cut to several possible card sizes. This lets you compare proportions before using your cardstock.

Step 3 - Choose the Orientation

Vertical formats work naturally with tall florals, figures, and stacked sentiments. Horizontal formats suit landscapes, multiple characters, long greetings, and wide arrangements.

Step 4 - Consider Production Time

If you are making many cards, choose a size that uses cardstock efficiently and works with envelopes you already own.

Step 5 - Check the Envelope and Postage

Confirm that the finished dimensions, thickness, shape, and weight meet your mailing needs. Postal rules can change and vary by location, so check with your local postal service when necessary.

Tips for the Best Results

• Choose the format before designing: Knowing the finished dimensions makes layout planning much easier.
• Measure the focal point: Compare the product dimensions with the intended card front before cutting the base.
• Make paper templates: Keep labeled samples of your favorite card sizes for quick reference.
• Score before folding: A score line helps create a cleaner fold and reduces cardstock cracking.
• Use a bone folder gently: Reinforce the fold without polishing or damaging the cardstock surface.
• Check orientation early: Decide whether the fold will be at the top or side before adding the design.
• Confirm the envelope: Unusual formats may require a custom envelope.
• Allow for dimension: Foam adhesive and embellishments can increase the mailing thickness.
• Test international conversions: A design created for A2 may need minor spacing changes when adapted to A6.
• Keep mailing requirements in mind: Check the current rules for square, rigid, oversized, or unusually thick envelopes.

Ways to Customize Your Card Format

• Rotate a vertical layout to create a horizontal card.
• Turn an A2 design into an international A6 version.
• Extend a repeating pattern across a slimline card.
• Crop a large background to fit a smaller panel.
• Use a square base for wreaths and centered arrangements.
• Transform a nesting die into a shaped card.
• Add an interactive element to a larger 5 x 7-inch format.
• Create a mini version of a favorite card using the same focal point.
• Add matting layers to adapt a smaller panel to a larger base.
• Change the card size to make better use of available cardstock scraps.

Frequently Asked Questions

What is the most common handmade card size in the United States?

US A2 is one of the most common formats. The finished card measures 4.25 x 5.5 inches and can be used vertically or horizontally.

What is the most common card size in the United Kingdom and Europe?

A6 is widely used in countries that follow ISO paper sizes. A finished A6 card measures approximately 4.13 x 5.83 inches, or 105 x 148 millimeters.

Are US A2 and international A6 cards the same size?

No. A2 is slightly wider and shorter, while A6 is slightly narrower and taller. Many products can be adapted between the two formats with small layout adjustments.

What size is a slimline card?

The slimline format used in this guide measures 3.5 x 8.5 inches. Trim the cardstock to 7 x 8.5 inches and score it at 3.5 inches.

What size is a mini slimline card?

The mini slimline format used here measures 3.5 x 6.5 inches. Trim the cardstock to 7 x 6.5 inches and score it at 3.5 inches.

Can I use A2 dies on an A6 card?

Often, yes. Individual images, sentiments, florals, and smaller nesting dies usually adapt easily. Full-panel dies may need to be cropped, repositioned, or used as a decorative layer rather than covering the entire card front.

Do square cards require additional postage?

Postal requirements vary by country and can change. Check with your local postal service before mailing square, oversized, rigid, or highly dimensional cards.

How do I decide which card size to use?

Consider the focal image, layout, orientation, number of elements, available envelope, mailing requirements, and whether you are making one card or producing several copies.

More Beginner Cardmaking Resources from Spellbinders

• Explore tutorials on the Spellbinders Blog
• Choose cardstock for handmade card bases and panels
• Explore nesting and layering dies
• Trim card bases and panels with a guillotine paper trimmer
• Find product instructions in the Assembly Guide Library

Choose the Card Size That Supports Your Idea

Understanding card sizes makes it easier to choose products, plan balanced layouts, cut cardstock efficiently, and prepare the correct envelope. A2 and A6 are dependable everyday formats, while 5 x 7, slimline, square, and shaped cards provide more room for specialized designs.

There is no single best card size. The right format is the one that supports your idea, works with your supplies, and makes the creative process enjoyable. Next in the Beginner’s Guide to Cardmaking Series, we will take a closer look at die cutting for beginners.

About the Author

Lisa Tilson is the cardmaker behind My Card Trip. She shares colorful handmade cards, detailed tutorials, and practical techniques designed to help cardmakers build confidence and enjoy the creative process.