Handmade cards come in many shapes and sizes, but knowing the most common measurements makes designing and cutting your cardstock much easier. This guide shares the most popular card sizes used by cardmakers, along with envelope recommendations and a handy printable reference chart you can keep near your craft desk.

Whether you’re creating birthday cards, holiday greetings, or everyday notes, these measurements will help you design cards that fit perfectly into envelopes.

Download the Free Card Size Printable

This printable includes the most common card sizes used in cardmaking so you can quickly reference measurements while crafting.

 

Standard Card Sizes for Handmade Cards

Below are some of the most commonly used card sizes among cardmakers.

A2 Card Size

The A2 card is the most popular size for handmade greeting cards and works beautifully for many stamping and die-cut designs.

Measurements

Folded size: 4.25 × 5.5 inches
Flat size: 8.5 × 5.5 inches
Envelope size: A2

Why cardmakers love it:

• Perfect for most stamp sets
• Fits standard envelopes, no extra postage cost if mostly flat (bulky needs non-machinable stamp surcharge)
• Ideal for layering designs

Slimline Card Size

Slimline cards are long and narrow, giving cardmakers extra space for scenes, slim dies, and creative layouts.

Measurements

Folded size: 3.5 × 8.5 inches
Flat size: 7 × 8.5 inches
Envelope size: Slimline or standard #10 business envelope, no extra postage cost if mostly flat (bulky needs non-machinable stamp surcharge)

Slimline cards are especially popular for:

• scene cards
• layered die designs
• horizontal stamping layouts

Mini Slimline Card Size

Similar to slimline just a bit smaller.

Measurements

Folded size: 3 × 6 inches
Flat size: 6 × 6 inches
Envelope size: Mini Slimline, A6, or #10 envelope

Slimline cards are especially popular for:

• scene cards
• layered die designs
• horizontal stamping layouts

ATC - Artist Trading Cards

Mini cards are small but charming and perfect for gift tags or quick notes.

Measurements

Folded size: 3.5 x 2.5 inches
Envelope size: Mini envelope such as #4 coin envelope or an A1 envelope is sending in the mail.

These are great for:

• gift enclosures
• quick greetings
• small stamp designs

Square Card Size

Square cards offer a unique look and are great for bold or centered designs.

Measurements

Folded size: 5.5 × 5.5 inches
Flat size: 11 × 5.5 inches
Envelope size: 6 × 6 envelope, requires extra postage

Square cards are perfect for:

• focal images
• symmetrical layouts
• modern card designs

 

Tips for Cutting Card Bases

• Use a scoring board for clean folds
• Choose heavyweight cardstock (80–110 lb cover)
• Cut multiple card bases at once to save time
• Keep a printed size chart in your craft space for quick reference

Helpful Supplies for Cardmaking

If you're creating handmade cards, these supplies can help bring your designs to life.

• stamp sets
• metal dies
• stencils
• patterned papers
• quick card fronts

Frequently Asked Questions

What is the most common card size?

The A2 card size (4.25 × 5.5 inches) is the most common size used in handmade cards.

What size envelope fits a slimline card?

Slimline cards typically fit a #10 envelope or a slimline envelope designed for longer cards. Think business size envelopes and they won't cost additional postage. 

Can I print the card size guide?

Yes! You can download the printable chart above and keep it near your craft workspace.

More Cardmaking Inspiration

Explore more creative ideas and tutorials from Whimsy Stamps:

• Slimline card inspiration
• Interactive card tutorials
• Quick and Easy cardmaking ideas
• Fun and Fancy Fold card tutorials
• Beginner cardmaking guides