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Birthday Card Sizes For Every Need + Party Planning Tips

Birthdays are a great time to get together with friends and family members to celebrate. If you’re hosting the party, you’re likely putting together some fun invitations to let your friends and family know the details of the celebration. Once your event is over, you’ll want to send your guests off with a thank you note and a cute party favor. And if you’re attending a party, it’s always a good idea to bring a birthday greeting card along with a memorable birthday gift for your loved one.

When you’re choosing your invitations, thank you notes and birthday cards, one of the first things you’ll want to decide on is the size of your cards. As you’re choosing the cards’ sizes, there are a few things you’ll want to keep in mind, including the theme of the party and the details you want to include. Read on to learn more about standard birthday card sizes as well as some tips for hosting a fun, memorable birthday party below.

Popular Birthday Card Sizes

Category/Style Card Size (in) Envelope Size (in) Best For
A7-Standard 5×7 5¼ x 7¼ Greeting cards, invitations, thank you cards
Square 5 x 5 5 ¼ x 5 ¼ Greeting cards, thank you cards, invitations
A2- Compact 4 ¼ x 5 ½ 4 ⅜ x 5 ¾ Invitations, thank you cards, RSVP cards
A10-Large 6 x 9 6¼ x 9 ¼ Greeting cards, large invitations
A1 3 ½ x 5 3 ⅝ x 5 ¼ Invitations, thank you cards, RSVP cards
A9-Large 5 ½ x 8 ½ 5 ⅝ x 8 ⅝ Greeting cards, invitations

Unsure about what size birthday card to get for your loved one? Here are some of the standard birthday card sizes along with some ideas for sizes for invitations and thank you cards.

Standard Birthday Card Sizes

Chart with different birthday card illustrations.

From compact cards to large cards, there are plenty of greeting card sizes to choose from. If you’re looking for the perfect card for your friend or family member, here are some of the most common folded greeting card sizes.

Folded 5 x 7

The standard folded greeting card size is 5 by 7, and it has plenty of space for both fun embellishments and a message for your loved one.

Folded 5 x 5

The square card is a modern, versatile card. Since it’s a bit smaller, make it pop by choosing a bright font for your happy birthday message.

Folded 6 x 9

This larger card is perfect for anyone who’s looking for a little extra space to write a longer message. You could also consider adding a photo to the front of this greeting card.

Standard Birthday Party Invitation Sizes

Table with different birthday stationery.

A unique invitation is a perfect way to get your guests excited about your party. If you’re ready to start designing your invite, here are some of the most popular invitation sizes.

Flat 5 x 7

This is the standard size and an excellent choice for an invitation—it has all the space you need to list your party details, and it also has room for some décor that matches your theme.

Flat 3½ x 5

If you’re looking for a budget-friendly, compact invite option, this postcard or RSVP sized invitation is a good choice. For a fun touch, consider adding a bright border to this smaller card.

Flat 6 x 9

If you have some extra details to include on your invitation, this larger card is an excellent choice for you. This broader invitation also has room for extra flourishes, such as cute illustrations or a photo.

Common Thank You Card Sizes

Table with thank you cards.

After the party is over, it’s always a good idea to give guests a thank you note to thank them for their sweet birthday gifts and for joining you at your celebration. To inspire you, here are some standard thank you card sizes.

3½ x 5

If you’d like to hand out thank you notes at the end of the party, this compact card is perfect for you. Your guests will love getting this sweet thank you note with your party favors.

4 ¼ x 5 ½

Want to include a photo or a note with your thank you card? This larger card is a good choice—it has space for all of these personalized touches.

Birthday Party Tips & Stationery Advice

Little girl opening a birthday gift.

Ready to begin planning your birthday party? To help you get started, here are some tips on everything from how to pick your theme to choosing activities for your party. Whether you’re planning an adult party or a party for your little one, these tips are sure to help you out.

 1. Establish Budget

One of the first things you’ll want to do is establish the budget for your party. If you’re planning on renting a space, check out how many different venues in your area cost. If you’re hosting at home, decide how much you’d like to spend on food and decorations. Establishing a budget early will make it easy to track how much you’re spending.

 2. Pick A Fun Theme

Make a list of different birthday party theme ideas that sound fun, and then go through the list and decide which ones work for your budget and inspire you the most. If you’re planning a party for your little one, consider using one of their favorite hobbies or movies as your theme idea.

 3. Set Date, Time And Location

Family celebrating a birthday around a dinner table.

To give your guests plenty of time to RSVP, try to set a date for your party about six weeks before your birthday. This will also provide you with time to book the perfect venue for your birthday.

 4. Start Your Guestlist Early

It’s also a good idea to put your guest list together about six weeks before your party. This way, you’ll have plenty of time to send out invitations, and you’ll know what size venue you need to book.

 5. Pick Food And Drinks

For your party menu, consider choosing food and drinks that match your theme. You can even come up with cute, pun-filled names for these treats!

 6. Choose Your Stationery

Different party planning stationery on a table.

It’s also a good idea to choose stationery for your invitations and thank you notes that match your theme. For example, if you’re going for a garden theme, you could select stationary with illustrated leaves around the borders.

 7. Plan Activities And Games

Activities and games are a fun addition to both adults’ and kids’ birthday parties. Plan some activities that go along with your theme—for example, if you’re hosting a superhero-themed kids’ party, you could have the kids make their own masks.

 8. Goodie Bags And Thank You Cards

At the end of the party, thank your guests for coming with a party favor and a thank you card. For adults, this favor could be a dessert wrapped up in a cute bag or an adorable DIY creation. For kids, candy and small toys are always a favorite.

Resources Related to Birthday Card Sizes

If you or a loved one have a birthday coming up, these tips will help you choose invitations, greeting cards, and thank you cards for this special day. Now, you’re ready to create a party you’ll love looking back on in your family photo book.