What Are the Dimensions of a Birthday Card? A Complete Size Guide
Whether you're designing a birthday card, printing your own, or ordering a personalized greeting card, one of the first questions you'll probably ask is:
What are the dimensions of a birthday card?
The answer depends on the style of card you're creating. Birthday cards come in several standard sizes, each suited to different occasions, messages, and designs.
This guide explains the most common birthday card dimensions, when to use each size, and how to choose the perfect format.
Standard Birthday Card Dimensions
Most greeting card companies use standard folded card sizes that fit readily available envelopes.
Here are the most common options.
Card SizeFolded DimensionsBest ForA24.25 × 5.5 inches (108 × 140 mm)Small birthday cardsA64.5 × 6.25 inches (114 × 159 mm)Personal birthday greetingsA75 × 7 inches (127 × 178 mm)Most popular birthday card sizeA95.5 × 8.5 inches (140 × 216 mm)Large birthday cardsSquare5 × 5 inches or 6 × 6 inchesModern and premium designs
The 5 × 7-inch birthday card (A7) is by far the most common size sold by greeting card retailers and online card companies.
The Most Popular Birthday Card Size
If you're unsure which size to choose, go with:
5 × 7 inches (127 × 178 mm)
This size offers the perfect balance between:
Plenty of writing space
Attractive proportions
Easy mailing
Professional appearance
Wide envelope availability
It's the standard size used for most:
Birthday greeting cards
Personalized birthday cards
Photo birthday cards
Premium greeting cards
If you've purchased a birthday card from a major retailer, there's a good chance it was 5 × 7 inches.
Birthday Card Dimensions in Inches
Here are the most common folded birthday card sizes.
4.25 × 5.5 inches
4.5 × 6.25 inches
5 × 7 inches
5.5 × 8.5 inches
6 × 6 inches (square)
Each offers a different amount of writing space and visual impact.
Birthday Card Dimensions in Centimeters
If you're using metric measurements, the same sizes are approximately:
InchesCentimeters4.25 × 5.510.8 × 14 cm4.5 × 6.2511.4 × 15.9 cm5 × 712.7 × 17.8 cm5.5 × 8.514 × 21.6 cm6 × 615.2 × 15.2 cm
These measurements are commonly used by print shops outside the United States.
Birthday Card Dimensions in Millimeters
For professional printing, dimensions are often provided in millimeters.
InchesMillimeters4.25 × 5.5108 × 140 mm4.5 × 6.25114 × 159 mm5 × 7127 × 178 mm5.5 × 8.5140 × 216 mm6 × 6152 × 152 mm
Millimeter measurements provide greater precision during printing and trimming.
Flat vs. Folded Birthday Card Size
Birthday cards are usually measured after folding.
For example:
Folded card: 5 × 7 inches
Flat (before folding): 10 × 7 inches
If you're creating artwork for printing, you'll usually design the full flat size before the card is folded.
Landscape vs. Portrait Birthday Cards
Birthday cards are available in two main orientations.
Portrait
Vertical cards are ideal for:
Elegant typography
Floral artwork
Traditional greeting cards
Photo cards
They remain the most common style.
Landscape
Horizontal cards work well for:
Scenic photographs
Group pictures
Pop-up cards
Modern minimalist designs
Both orientations use the same dimensions—the difference is simply how the card is folded and displayed.
Square Birthday Cards
Square greeting cards have become increasingly popular because of their modern appearance.
Popular sizes include:
5 × 5 inches
6 × 6 inches
6.5 × 6.5 inches
Square cards are often chosen for:
Luxury greeting cards
Wedding invitations
Photo cards
Designer collections
Keep in mind that square envelopes may require additional postage in some countries.
Oversized Birthday Cards
Large birthday cards create a dramatic impression and offer plenty of space for multiple signatures.
Common oversized dimensions include:
8 × 10 inches
11 × 14 inches
12 × 18 inches
They're especially popular for:
Office celebrations
Retirement parties
Group birthday messages
Classroom birthdays
What Size Envelope Fits a Birthday Card?
Choosing the correct envelope is just as important as choosing the card size.
Common pairings include:
Card SizeMatching Envelope4.25 × 5.5 inA2 Envelope4.5 × 6.25 inA6 Envelope5 × 7 inA7 Envelope5.5 × 8.5 inA9 Envelope
Using the correct envelope ensures the card fits neatly and is protected during mailing.
How to Choose the Right Birthday Card Size
The ideal size depends on the occasion and the recipient.
Small Cards (A2)
Perfect for:
Simple birthday wishes
Gift enclosures
Children's gifts
Medium Cards (A6)
Ideal for:
Personal messages
Friends
Family
Standard Cards (A7)
Best for:
Most birthdays
Personalized cards
Photo cards
Premium greeting cards
Large Cards (A9)
Great for:
Longer handwritten messages
Group signatures
Milestone birthdays
Extra-large designs
Tips for Designing a Birthday Card
If you're creating your own card, keep these design tips in mind:
Leave enough space for handwritten messages.
Use high-resolution images (300 DPI for print).
Include a safe margin around the edges to prevent trimming important elements.
Choose readable fonts for the inside message.
Match the card size to the envelope before printing.
Fold along the longest edge for a professional finish.
A well-planned layout makes your birthday card look polished and professional.
Frequently Asked Questions
What is the standard size of a birthday card?
The most common birthday card size is 5 × 7 inches (127 × 178 mm). It offers plenty of space for a heartfelt message while fitting standard A7 envelopes.
What size is a birthday card in centimeters?
A standard 5 × 7-inch birthday card measures approximately 12.7 × 17.8 cm when folded.
What size should I use for a homemade birthday card?
A 5 × 7-inch folded card is an excellent choice for homemade birthday cards because it's easy to create, fits standard envelopes, and provides enough space for decorations and personal messages.
Are all birthday cards the same size?
No. Birthday cards come in several sizes, including A2, A6, A7, A9, and square formats. The most popular, however, is the 5 × 7-inch folded card.
What is the best size for a personalized birthday card?
A 5 × 7-inch card is generally the best option for personalized birthday cards because it provides ample room for photos, names, custom artwork, and handwritten messages.
Choose the Perfect Birthday Card Size
The dimensions of a birthday card may seem like a small detail, but choosing the right size can make a big difference in both appearance and usability.
Whether you're creating a handmade card, designing a personalized keepsake, or ordering a professionally printed greeting card, the 5 × 7-inch standard birthday card remains the most versatile and popular choice for almost every celebration.
Looking for a beautifully designed card that's ready to personalize? Browse our collection of Birthday Greeting Cards to find premium designs in the perfect size for every birthday celebration.