How Many Stamps For A 6×9 Envelope? Updated 2024

Do you wish to know how many stamps for a 6×9 envelope? If yes, this post is for you. Several factors determine the number of stamps required for a 6×9 envelope. These include the item’s weight, size, and where the parcel is heading to. So, there is no direct answer to the question of the number of stamps required.

When mailing a letter, I use a single stamp. However, the number of stamps required for irregularly shaped, heavy, or oversized envelopes differs.

The charges are low when mailing flat envelopes via the US Postal Service as such envelopes can fit into the automated equipment. If the envelope can’t, you’ll pay more.

This article contains information on the stamps required for 6×9 envelopes, including other related information. Keep scrolling down for more!

The Response To How Many Stamps For A 6×9 Envelope?

The U.S Postal Service (USPS) sees the 6X9 envelopes as letters. Why? It’s because of their sizes. According to the agency’s guidelines, the 6×9 envelope boasts the same dimensions as letters.

So, how many postage stamps does the 6×9 envelope require? If the envelope weighs at least an ounce or less, you’ll require one first-class stamp.  If it exceeds an ounce, you’ll have to pay for every additional ounce.

Keep reading for more information on this topic.

How Much It Cost To Mail A 6×9 Envelope

How Much It Cost To Mail A 6×9 Envelope

The mail class a sender or customer chooses determines the postage rate. But keep in mind that the 6×9 envelopes weighing an ounce or less are mostly sent as First-Class letters.

However, a First-Class letter does require a First-Class stamp, also called a “Forever Stamp.” Now, here’s how much such stamps cost.

The current price of the Forever Stamp is $0.58. So if your letter weighs an ounce, you’ll be paying $0.58 for the postage stamp.

If your envelope weighs above an ounce, it can be sent via First Class Mail service. But keep in mind that you’ll incur extra charges. By the way, every extra ounce would attract a $0.20 fee.

So, if you were mailing a 6×9 envelope that weighs between 1.1 ounces to 2 ounces, the postal stamp required would cost $0.78. That is ($0.50 + $0.20 for the extra ounce).

Furthermore, you have to pay $0.98 if your 6×9 envelope weighs 2.1 ounces to 3 ounces.

But if the envelope weighs between 3.1 ounces to 3.5 ounces, you have to pay $1.18 to send it.

Now, here’s another question. How much will it cost to mail an envelope that weighs over 3.5 ounces? 

Firstly, understand that the USPS doesn’t consider envelopes that weigh over 3.5 ounces as letters. The agency categorizes them as large envelopes. And such envelopes have their price tags. You can also learn how many stamps you need for a manila envelope

What It Cost To Mail A 6X9 Bubble Envelope

The cost of mailing a 6×9 bubble envelope depends on the weight, including how your postal service considers it. The postal service may view it as an envelope or package.

Now, here’s the thing. If your Bubble Envelope weighs an ounce or less, it’s categorized as an envelope. In this case, you can place a $0.55 Forever Stamp on it and drop it at your usual postal service for mailing.

What makes bubble mail a package? Well, it depends on the envelope’s weight.

If your packed bubble mailer weighs over 3/4 of an inch thicker, it’s considered a package. But if the bubble mailer is less than or equal to 3/4 of an inch thick once packed, it’s considered an envelope.

The US Postal Service has proposed a postage stamp price hike. You can expect the new price to take effect from 2024.

Understanding The Postal Stamp You Need For A Bubble Mailer

Understanding The Postal Stamp You Need For A Bubble Mailer

You can use various stamps on your bubble mailer. And keep in mind that the package’s weight determines the type of stamp one can use.

Let’s discuss the types of stamps for a bubble mailer, and weight of the proposed package.

USPS First Class Mail Letters:

USPS First Class Mail Letters

Are you shipping a personal package, and does your package weigh above 16 ounces? If yes, then you can use the USPS First Class.

If you’re going for First-Class Mail letters, note that prices for packages that weigh up to 13 Oz start at $4.50.

Many may wonder how fast the USPS First-Class is. Well, you can expect your parcel within 1 to 3 working days. The First Class boasts a free tracking option. However, keep in mind that the tracking option USPS offers for First Class mail is only for smaller parcels weighing 13 ounces or less.

In a nutshell, the USPS First Class is an affordable and convenient way to mail envelopes, including lightweight packages.

A Handy Tip:  Average delivery time for First Class packages is 1 to 3 working days. But keep in mind that marketing mails and periodicals may take up to 8 days or more.

  First Class Mail Package Type Price (starting price)
Letters Standard-sized, rectangular envelope stamps $0.66
Square, oversized or unusually shaped envelope stamps $1.66
 Postcards Standard-sized rectangular postcard stamps $0.51
Oversized postcards need letter stamps $0.66
Large Envelopes Large envelopes (flats) $1.35

USPS Retail Ground:

Another mailing option is the Retail Ground. In this case, your bubble mailer has to weigh below 70 lbs. Another criterion is that you must be shipping occasionally via a retail channel.

Now, how long does the USPS Retail Ground Mail take to deliver? Delivery time is around 2 to 8 days.

The USPS Retail Ground offers an economical and reliable way to ship mails that are quite large. You’ll also have the option to track any package at zero cost to you.

Additionally, the Retail Ground Mail is ideal for shipping oversized packages, with less-than-urgent delivery. Charges start at $8.50.

You might also be wondering why the USPS Retail Ground Mail takes so long to deliver parcels. Here’s the reason.

As the name suggests, USPS Retail Ground depends on ground transportation to deliver parcels. It uses trucks and semi-trucks for delivery, unlike priority mail that loads mail on an airplane.

USPS Priority Mail: 

With the Priority Mail, you can ship packages weighing up to 70 lbs to any state of choice within the U.S. Just ensure the package’s weight should be below 70 pounds.

By the way, you can also use the Retail Ground Mail as an eCommerce business owner if you don’t fancy using the Priority Mail.

Now, how fast is Priority Mail’s delivery? Delivery time for packages sent via Priority Mail is 1 to 3 days. It’s the most affordable way to ship packages within a short time.

USPS Media Mail:

The Media Mail, as the name implies, is used to mail media content. Just ensure your parcel weighs below 70 pounds.

The USPS Media Mail is used for mailing media materials such as books, DVDs, CDs, Blu-Ray, Vinyl records, printed music, videotapes, and other sound recordings.

So, if you want to send educational and media materials, you can use the USPS Media Mail. But keep in mind that there’s a restriction on the media content you can send.

How much does Media Mail cost? Price starts at $3.19.

How long does USPS Media Mail take to deliver? Delivery time advertised by USPS is 2 to 8 working days.

Many people may be wondering why the Media Mail takes so long. Well, the thing is Media Mails are delivered via trucks. They’re not like Priority or Express Mails transported via airplanes.

A Handy Tip: You can send packages that weigh approximately 70 pounds or measures 108 inches in length via Media Mail. Just know that if your package weighs below 8 ounces, sending it via First-Class Mail would be much cheaper.

Items You Cannot Send Via USPS Media Mail 

The USPS has a list of media materials it doesn’t ship via Media Mail. So, go through the list of items to make an informed decision.

Here is the list of items USPS Media Mail doesn’t accept.

  • Puzzles
  • Pencils
  • Empty binders
  • Video games
  • Vintage magazines
  • Any kind of advertising

People Also Ask

How Many Stamps Do I Need For A 6×9 Envelope? 

As explained earlier, several factors determine the number of stamps you’ll need to mail a 6×9 envelope in the United States of America. You’ll require one stamp to send an ounce 6×9 envelope. You’ll require the same number of stamps for a lesser ounce.

Is The 6X9 Envelope Considered A Large Envelope?

Large envelopes and “flats” are often used interchangeably. When the US Postal Service uses flats, it means large envelopes, magazines, and newsletters.

Flats should have the following:

  • One of its dimensions is greater than 6-1/8 higher, ¼ inch thicker or 11-1/2 inch longer.
  • The envelope mustn’t be more than 12 inches taller, 15 inches longer, or ¾ inches thicker.

A Handy Tip: Large envelopes exceed one or more of the letter size total dimension

Here are the dimensions of large envelopes

Dimension Minimum Maximum
Length 11-1/2 inches 15 inches
Height 6-1/2 inches 12 inches
Thickness ¼ inches ¾ inches

How Much Do Envelopes Weigh?

The weight of a standard #10 envelope, whose dimension is 4.5” x 9.75”, is 6.75 grams or 0.238 ounces, on average.

You can assume that an envelope of any weight or paper type will weigh 0.1 to 0.5.

Understand that different types of envelopes exist. However, the #10 envelope remains the most popular commercially used envelope.

What Is A 6×9 Envelope Used For?

The 6” x 9” envelopes are a wise choice for businesses and not-for-profit correspondence.

It can fit into a 5.5” x 8.5 booklet or an 8.5” x 11” letter folded in half, including more inside this envelope size.

What Is A 6×9 Envelope?

A 6×9 envelope is called a booklet envelope or open-sided envelope. It is popularly used for mailing reports, letters, or documents folded in half.

How Big Is A 6×9 Envelope?

The maximum enclosure of this envelope is 5.75 x 8.75 inches.


So, how many stamps for a 6×9 envelope? The USPS considers this type of envelope as a letter because it fits the dimension of letters.

If the 6×9 envelope weighs an ounce or less, you’ll need one stamp. If it weighs above an ounce, you’ll require additional ounces.

Every additional ounce incurs extra charges. You have to understand this when sending packages via mail.

Additionally, mails weighing 3.5 ounces or more are no longer letters. The USPS considers them as large envelopes. And the cost of mailing such envelopes differs.

Francis Stein
Francis Stein
Francis Stein is a writer and traveler who has already traveled most of the states of America. He loves to explore new places and meet new people, and he hopes to continue traveling the world in search of adventure. Francis enjoys writing about his experiences as a way of sharing his love for exploration with others.


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