What Are Standard Birthday Card Dimensions? A Brief Guide
April 27, 2026 
The most common standard birthday card dimensions in the US are 5 x 7 inches (A7 size). Other popular sizes include 4.25 x 5.5 inches (A2) and 4.5 x 6.25 inches (A6). The use of standard greeting card sizes ensures easy envelope matching and reduces USPS mailing costs.
Your business wants everything to look perfect, whether you are sending out a greeting to a client or stocking shelves at retail. But what are the accurate dimensions of a birthday card that actually work best? Wrongly choosing a size can lead to wasted money, unsatisfied clients, and a lot of extra work. Unless your greeting cards fit in normal envelopes, you'll have to pay extra postal charges.
In this blog, we will discuss all your queries about birthday card dimensions. We will look at the precise dimensions you need in inches, centimeters, and pixels. You will learn how to match your cards with the right envelopes and how to avoid costly shipping mistakes. After reading these well detailed, you will have complete confidence in how to plan your next print run. Let us get started and look at the best sizes for your business needs!
Key Takeaways
A7 birthday cards (5 x 7 inches) are the best choice for premium cards.
Standard sizes prevent your business from paying additional USPS postage.
Always leave a quarter inch of space around your envelopes.
Square cards look great, but are more costly to mail since they can't be machined.
Prevent ugly white borders on your design files by adding a bleed area.
Whenever you order bulk printing with Print247, you'll receive free shipping for all standard sizes.
Why Do Standard Birthday Card Dimensions Matter for Your Business?
It is estimated that millions of greeting cards are distributed every year. The US greeting card market is huge.
According to GrandViewResearch,
The U.S. greeting cards market was valued at USD 7.12 billion in 2025 and is expected to reach USD 8.07 billion by 2033, growing at a CAGR of 1.6% from 2026 to 2033.
In order to establish a foothold in that market, a business must do the basics right. Having a clear understanding of the dimensions of a birthday card is the first step to running a successful party.
Choosing a random size can lead to serious problems.
The first problem is mismatched envelopes. The availability of envelopes for odd shapes is very limited. As a result, your packing team will be slower and the professional look will be ruined.
The second problem is that you waste materials. A printer uses large sheets of paper. When your birthday card dimension does not fit neatly on these big sheets, a lot of paper is wasted. The waste you generate costs you money.
One of the biggest pain points is extra postage. Mail needs to be sorted quickly by post office machines, which require specific sizes. Your card will not be able to be machinable if it has an odd shape, such as a square. Mailing a non-machinable card will cost you between 49 and 78 cents more in 2026. These extra fees will quickly eat away at your profits if you send thousands of cards.
Therefore sticking to standard birthday card dimensions solves all these issues. Your designs print easily, the envelopes match perfectly, and you save a lot of money on shipping.
What Are Most Common Standard Birthday Card Sizes in the US?
It is extremely important to know the exact number of copies when planning your next print run. Let's check out a look at the most popular sizes. We will mention birthday card dimensions in inches, millimeters, and how they cut from a standard sheet.
A2 Birthday Card Dimensions
The A2 card dimensions are 4.25 x 5.5 inches. It is perfect for a quick thank you or a simple birthday note. It cuts very well from a standard 8.5 x 11 inch paper sheet with almost zero waste.
A6 Birthday Card Dimensions
The A6 birthday card size is a 4.5 x 6.25 card. This size gives you a bit more room for beautiful graphics or photos while still being very easy to mail.
A7 Birthday Card Dimensions
The A7 size is 5 x 7 inches. If a client asks for a 5x7 greeting card, this is it. It is the classic, premium choice for most retail shelves and corporate mailings.
Square Birthday Card Dimensions
There is something very modern about square sizes, such as 5 x 5 or 6 x 6 inches. The colors stand out on a desk. Don't forget that they are more expensive to mail.
Here is a clear birthday card dimensions chart for your business:
Card Name | Folded Size (Inches) | Flat Sheet Size (Inches) | Best Use Case | Paper Waste Risk |
A2 | 4.25 x 5.5 | 5.5 x 8.5 | Simple business notes | Very Low |
A6 | 4.5 x 6.25 | 6.25 x 9.0 | Photo cards | Low |
A7 | 5 x 7 | 7 x 10 | Premium retail cards | Low |
Square | 5 x 5 | 5 x 10 | Modern brand invites | Medium |
A1 Mini | 3.5 x 4.875 | 4.875 x 7.0 | Gift basket inserts | Low |
There are also many people who want to know the dimensions of birthday cards in cm and mm. It is approximately 12.7 x 17.78 cm or 127 x 177.8 mm for the popular A7 size.
Matching Birthday Card Sizes With Envelopes
Unless you have the right envelope, you cannot send a card. Choosing the right birthday card envelope dimensions is just as important as choosing the right card itself. The rule is very straightforward. It is recommended that the envelope is a quarter inch larger than the birthday card. It allows folded card sizes to slide in smoothly without tearing the paper.
If you are printing standard sizes, finding standard card envelope sizes is very easy.
Card Size | Card Dimensions | Matching Envelope Size | Envelope Dimensions |
A2 | 4.25 x 5.5 inches | A2 Envelope | 4.375 x 5.75 inches |
A6 | 4.5 x 6.25 inches | A6 Envelope | 4.75 x 6.5 inches |
A7 | 5 x 7 inches | A7 Envelope | 5.25 x 7.25 inches |
Square | 5 x 5 inches | 5.5 Square Envelope | 5.5 x 5.5 inches |
If you need the A7 envelope size or any other exact pairings, Print247 has you covered with bulk envelope options that fit these cards perfectly.
Final Thoughts
Birthday card dimensions are one of those foundational decisions that affect everything downstream. It affects your envelope fit, your postage costs, your print efficiency, and how your brand is perceived when the card reaches its recipient. Professionals use the A7 (5" x 7") size for good reason. It balances design space, mailing compliance, and perceived quality better than any other size. When your budget is tight, the A2 and A6 are both good options that will still produce a clean, professional look.
Make sure you know your size before you begin designing, match your envelope before printing, and always set your files up at 300 DPI with proper bleeds. By following those three simple steps, you can avoid the most expensive and common errors when printing birthday cards.
Business leaders across industries rely on Print247 to provide packaging and printing services for their next print run. Besides providing free design support and free shipping, we also offer eco-friendly options and quick production turnarounds, so you know exactly what you're getting before going to press.
FAQs
What is the standard birthday card size that most US printers use as a default?
Most professional birthday cards in the US are printed on A7 cards, which measure 5" x 7" folded. The card provides plenty of design space, fits widely available A7 envelopes, and qualifies for standard first-class postage. This size is usually available as a ready-to-order stock option from commercial printers.
Can I use the same size template for both birthday cards and event invitations?
That's exactly what many businesses do. The standard size for birthday invitations in the US corresponds to the standard size for birthday cards, which is 5" x 7" folded (A7). Using the same template layout for both saves time on design and allows for better pricing per piece with your printer.
What resolution should my birthday card design files be for professional printing?
Make sure your print files are at least 300 DPI. If a file is set up for web use at 72 DPI, it will appear pixelated or blurry when printed on cardstock. If you are wondering what birthday card dimensions pixels are, multiply your inch dimensions by 300. If you're designing a 5" x 7" card, your design file should be 1500 x 2100 pixels.
What is the practical difference between an A6 and A7 birthday card for business use?
In terms of size, the 4.5 x 6.25 (A6) card is perfect for photo-forward designs and shorter messages. In terms of surface area, the A7 is about 20% larger, allowing for more space for logo placement, longer written content, or detailed artwork. It fits into widely available envelopes and qualifies for first class postage. Generally, businesses use A7 for client-facing campaigns and A6 for internal or budget-sensitive campaigns.
Do birthday card dimensions differ when printing for international recipients?
The dimensions of birthday cards remain the same during production, but postal standards vary from country to country. Many European countries follow ISO paper size conventions like A5 and A6, whereas the US follows envelope-based standards (A2, A6, A7). When shipping a large order of US-printed birthday cards internationally, make sure the size you choose is in compliance with the destination country's postal regulations.
April 29, 2026
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