As the digital world continues evolving, there may be doubts about the relevance of physical mail. However, when it comes to announcements, sending letters and using envelopes still hold significant importance. This is where announcement envelope sizes come in, 

The size of an envelope is not a detail but plays a crucial role in both postage and presentation. It’s about style, culture, presentation, brand representation, and more. 

Different Envelopes Sizes, Their Types and Uses

Announcement envelopes, also known as “A size” envelopes, have a place in the world of correspondence. They are specifically designed to meet requirements for announcements, invitations, greeting cards and similar items. In the following sections, we will explore announcement envelope sizes and their specific purposes so that you can select the appropriate one for each occasion.

Understanding ‘A’ Size Envelopes

The term “A size” refers to a range of envelope sizes that are particularly well-suited for announcements. They come in varied sizes, each tailored to fulfill a purpose.

A2 Envelopes (4 3/8 x 5 3/4 inches encompass envelope sizes that are ideal for RSVP cards, thank you cards, and informal notes. Because of their size, they are commonly used for letters, making them a popular choice for wedding-related correspondence.

A6 Envelopes (4 3/4 x 6 1/2 inches), larger than the A2 size, are perfect for invitations, greeting cards, and promotional materials. Their versatility makes them a favored option for both business letters.

A7 Envelopes (5 1/4 x 7 1/4 inches) envelopes are widely recognized as the size for invitations, particularly wedding invitations. They perfectly accommodate a 5 x 7-inch card, making them ideal for occasions.

A9 Envelopes (5 3/4 x 8 3/4 inches) are Designed to hold a folded sheet of paper, and these envelopes are well suited for newsletters, brochures, and larger greeting cards.

A10 Envelopes (6 x 9 1/2 inches), being the largest in the A size category, are suitable for announcements or when multiple invitations or additional items like RSVP cards need to be included in an envelope.

Square Envelopes: Their Appeal

In addition to rectangular announcement envelopes, square envelope sizes have gained popularity due to their uniqueness and suitability for events. Square envelopes come in sizes ranging from 5 x 5 inches to 6 x 6 inches, giving them a trendy vibe. They have many uses, including:

Unique Invitations

If you want your event invitation to stand out, consider using an envelope. Its unconventional shape sparks curiosity and suggests a non-traditional affair.

Photo Mails

Square photos are currently in vogue, making envelopes the perfect choice for photographers or anyone sharing snapshots.

Quality Matters

When selecting the right envelope sizes, it’s crucial to consider factors like paper quality, color options, and decorative elements such as linings or embossing. These details play a key role in setting the tone for the content. 

For example, an A7 envelope with gold embossing might indicate a wedding celebration. On the other hand, an A6 envelope made of minimalist recycled paper could be ideal for a casual event or environmentally conscious announcements.

How Envelope Sizes Affect the Postage Cost

It’s essential to understand how postal services calculate postage before discussing envelope sizes. Two factors typically determine postage:

1. Weight of the Mail: Heavier envelopes generally incur costs.

2. Dimensions of the Envelope: Size classifications such as standard, large, or package can impact pricing.

When it comes to the thickness of an item, it can determine whether an envelope is considered a letter or a parcel, which can result in charges. Additionally, whether you’re shipping domestically or internationally also plays a role in the cost.

Standard envelopes are the most commonly used sizes, typically measuring around 6 1/8 x 11 1/2 inches. These are perfect for mail such as bills, letters, and regular announcements. Postal services offer rates for these sizes to make them more affordable.

Non-standard envelopes refer to those that don’t fit within the size dimensions. They might be large, small, square-shaped, or have unique designs. While they certainly stand out and make a statement visually, they often come with charges due to handling requirements.

Now let’s discuss announcement envelopes – These are larger than the dimensions but not big enough to be classified as parcels. They’re particularly useful for purposes like:

1. Legal Documents: For papers that cannot be folded to fit into standard envelopes.

2. Catalogs and Magazines: These items require envelopes due to their size and bulk.

3. Special Announcements: When you want to make an impact with invitations, like opening events.

When using envelopes, it’s important to consider the higher postage costs. These envelopes tend to weigh more and require handling, which postal services charge extra for.

Tips for Cost Postage

To optimize your postage costs, here are some suggestions:

1. Familiarize yourself with envelope sizes to avoid expenses.

2. If you’re sending bulk mailings, consider pre-sorting, as it may lead to discounts.

3. Take advantage of reduced rates for quantities by opting for mailing.

4. Stay updated on rates and regulations to ensure you’re getting the best possible rates.

Presenting Your Mail: Making a Memorable First Impression

The envelope is the first thing recipients notice about your mail, so it’s crucial to make an impression. Choosing announcement envelope sizes showcases attention to detail and professionalism.

Branding Opportunities: Larger Envelopes Make a Statement

Larger envelopes provide space for elements, allowing businesses to convey their message effectively.

Enhanced Legibility: Clear Addresses for Smooth Delivery

Ensuring that your envelope isn’t cramped allows for visibility of the address, reducing the likelihood of delivery errors.

Specialized Envelopes and Their Unique Requirements

Different types of mail require envelopes to meet their needs:

Legal Documents

These often necessitate longer envelopes to accommodate legal-sized papers without folding. Important in the legal and many business professions. 


They require durable envelopes capable of withstanding the weight and volume of their contents. The right selection here is key. 

When it comes to envelopes, size and quality are closely linked.

Environmental Concerns and Envelope Choices

With the increasing focus on awareness, businesses are choosing their announcement envelope sizes based on several aspects:


Envelopes made from recycled or sustainable materials are gaining popularity.

Optimal Size Selection

By choosing the envelope, businesses can minimize waste and demonstrate their commitment to sustainability.


In the evolving realm of print and digital communications, one might consider envelopes a detail. However, as we have observed, the size of an envelope can significantly impact both postage costs and overall presentation. For both businesses and individuals, understanding the intricacies of envelope sizes can lead to cost savings, improved brand perception, and a significant environmental impact. 

You have options. Put your best face forward and choose well!