How many stumps do i need

How Many Stamps Do I Need To Send A Letter In The U.S.?

If you are sending out a piece of mail, you might have many questions popping up in your mind. One of them might be, “How many stamps do I need to send a letter?” To find this out, you need to know the size and weight of your mail. Also, the distance it is traveling. Normally, if your mail is in a regular-size envelope and it weighs up to 3.5 Oz, you need only one stamp. The current price of a stamp can be found on the official USPS website. Or you can ask your local post office. 

Post is an old channel for communication. Not all people use posts now. Today, official authorities, educational institutes, and businesses use posts. The United States Postal Service (USPS) offers a variety of mail and shipping services. Understanding each service can be a challenge. You can get confused while selecting the suitable service for you. We are here to make this simple for you. This article is all about postage stamps. It will answer the question, “How many stamps do I need to send a letter?” in an elaborate way.

What Are Postage Stamps?

What Are Postage Stamps?

In the United States, a postage stamp is issued by the USPS (United States Postal Service). It is a small printed piece of paper that shows that the postage fee has been prepaid. The postage stamp has a specific value that is mentioned on it. It is attached to a letter or package by glue. This attachment shows that a postage fee for that letter or package is paid.

While sending a letter or package, everyone wonders, “How many stamps do you need to send a letter?” We will explain this in depth here.

How Many Stamps Do I Need To Send A Letter?

How Many Stamps Do I Need To Send A Letter In The U.S?  A standard first-class letter envelope of the perfect size (rectangular) within 1 ounce

Every time you try to send a mail by post, you ask yourself, “How many stamps do I need?” A lot of us ask ourselves the same question. For a business, sending mail is a regular thing. They might face this question on a regular basis.

The answer to this question is not as hard as you might think. First, you need to find out the correct stamp for your relevant shipping. Then for the number of stamps, you need to consider the following aspects:

You need to take into account some other factors too. This detailed guide will answer all your stamp-related questions. Let’s first discuss the types of shipping and the number of stamps you need for each.

Domestic Letter Mailing:

If you are sending a letter to an address within the United States, your mail will fall under the category of Domestic Letter Mailing.

For this, you only need a Domestic Forever Stamp. Its price is $0.66. The letter bearing the Domestic Forever Stamp will be delivered in 1–5 business days. But certain conditions are applied. First of all your mail must weigh up to 1 Oz. So, if your mail weighs more than 1 Oz, you can pay additional 40 cents for every additional ounce.

Requirements for Domestic Letter Mailing:

Furthermore, there are some other conditions that you need to satisfy if you want to send your mail at $0.66.

  • The dimension of the envelope must be from 5 x 3.5 inches (minimum) to 11.5 x 6.125 inches (maximum).
  • The thickness of the envelope must be from 0.007 to 0.25 inches. It must be even.
  • The shape of the envelope must be rectangular. For weird shapes, you will be charged extra.
  • The mailpiece must be machinable. Otherwise, you will be charged extra.
  • If the envelope is square-shaped, the dimension must be 5 x 5 inches. Square-shaped mail will be classified as non-machinable.

How Many Stamps Do You Need for Domestic Letter Mailing?

The rate of a Forever Stamp ($0.66) covers only the first ounce. For additional ounces, you have to use additional stamps and pay additional charges.

WeightNumber of StampsType of StampCost
1 Oz1Domestic Forever Stamp$0.66
2 Oz1Domestic Forever Stamp$0.66
1Additional Ounce Stamp  $0.24
3 Oz 1Domestic Forever Stamp$0.66
2Additional Ounce Stamp$0.48
3.5 Oz  1Domestic Forever Stamp$0.66
1Postcard Stamp$0.51
110 Cents Stamp$0.10
Important Note: If your mail is more than 3.5 Oz, it will be categorized under “Flats”. So, you need to see the rates for Flats (3.5 Oz to 13 Oz).

Domestic Postcard Shipping:

Domestic Postcard Shipping

You will need a Postcard Stamp for sending postcards within the United States. Domestic Postcard Shipping is cheaper than letter mailing. A Postcard Stamp only costs $0.51

Requirements for Domestic Postcard Shipping:

  • The postcard must be rectangular. Otherwise, there will be different price rules.
  • The dimension of the postcard must be from 5 x 3.5 inches (minimum) to 6 x 4.25 inches (maximum).
  • The thickness of the postcard must be from 0.007 inches to 0.016 inches.
  • The postcard must not be higher than 4.25 inches and longer than 6 inches.

International Letter Mailing:

International Letter Mailing

With USPS, you can send international letters anywhere in the world. Here are the features of international letter shipping for the two most popular countries.

USA to UK: How Many Stamps You Required?

For sending letters from the US to the UK, a Global Forever Stamp is the best. It is suitable for all international mail. It will cost you $1.50.

You can also use Domestic Forever Stamps for sending mail to the UK. But that would not be ideal for you. You will end up paying extra.

So now you might be wondering, “How many stamps you need to send a letter to the UK?” or “How many stamps do you need per Oz?” and how much for forever stamps? Read the table below to get the answers to these questions.

WeightNumber of StampsType of StampsCost
1 Oz1Global Forever Stamp$1.50
2 Oz1Global Forever Stamp$1.50
1Domestic Forever Stamp$0.66
2Additional Ounce Stamp$0.48
115 Cents Stamp$0.15
3 Oz2Global Forever Stamps$3.00
1Domestic Forever Stamp$0.66 
1Additional Ounce Stamp$0.24
115 Cents Stamp$0.15
12 Cent Stamp$0.02
3.5 Oz3Global Forever Stamps$4.50
1Domestic Forever Stamps$0.66
1Additional Ounce Stamp$0.24

USA to Canada: How Many Stamps Do I Need?

How many stamps do you need to send a letter to Canada? How many stamps you need per ounce? Just like the mail to the UK, Global Forever Stamps are also best for mail to Canada.

Normally, you have to overpay for additional ounces other than the first ounce. But for mail to Canada, your mail can weigh up to 2 ounces without extra charges. If your mail exceeds this 2 Oz limit, you will be charged extra.

WeightNumber of StampsType of StampsCost
1 Oz1Global Forever Stamp$1.50
2 Oz1Global Forever Stamp$1.50
3 Oz1Global Forever Stamp$1.50
2Additional Ounce stamp$0.48
110 Cent Stamp$0.10
12 Cents Stamp$0.02
11 cent Stamp$0.01
3.5 Oz1Global Forever Stamp$1.50
1Domestic Forever Stamp$0.66
2Additional Ounce Stamp$0.48
15 Cents Stamp$0.05
12 Cents Stamp$0.02
11 Cent Stamp$0.01

Important Note: You can use only Domestic Forever Stamps if you cannot find Global Forever Stamps. But you must remember, you will have to pay an extra amount.

What are Flats?

Flats are large envelopes that must be used for bigger-size mail. The mailpieces that weigh more than 3.5 Oz, have to be in flats. A maximum of 13 Oz can be sent by using flats. If the following conditions are satisfied, your large envelope will be classified as flats by USPS. 

  • Flat must be rectangular. It must have square corners.
  • Flat must not be thicker than 0.75 inches and it must be evenly thick.
  • Flat must be flexible.
  • The dimension of the flat must be from 11.25 x 6.125 inches (minimum) to 15 x 12 inches (maximum).

If your large envelope does not meet the above criteria, you will be charged the applicable package price.

How Many Stamps Do You Need to Send a Parcel?

Well, now you must be thinking, “How many stamps do you need to send a parcel?” Sending a parcel is a little more complex than sending a letter. For this, you have two methods:

  1. Ask your local post office
  2. Use the USPS calculator

How to use USPS Calculator?

The United States Postal Service (USPS) has provided an online calculator to calculate the postage price yourself. It’s a very easy process. Follow the following steps to calculate the postage price for your parcel.

  • Step 1: Go to USPS Postage Price Calculator.
  • Step 2: Fill in all the required details.
  • Step 3: Select the intended type of service.
  • Step 4: Compare the rates by clicking, “Display All Options”.
  • Step 5: Pay for the shipment. 
  • Step 6: Download and print labels.

The calculator also gives you the number and type of stamps you need to send your parcel.

Where to Buy the Stamps?

  • You can buy new stamps at your local post office. 
  • You can see and order stamps at the official USPS website.
  • You can call 1-800-STAMP 24 (1-800-782-6724) to buy stamps.
  • You can buy stamps from stamp dealers.
  • You can order stamps online from online sellers.
  • You can also buy stamps at the Stamps Show.
  • You can get stamps through fax too.

What Happens if I send a Letter Without The Right Amount of Stamps?

Understanding the answer to the question, “How many stamps you need” is very important. If you send a letter without the right amount of stamps, the post office will collect the postage fee from the recipient. 

If the recipient refuses to pay, the mail will be returned to you. And if you didn’t mention the return address, your mail will be sent to “Dead Letters”.


How Many Stamps Do I Need For A 9×12 Envelope?

You need two Domestic Forever Stamps to send a 9 x 12 inches envelope. This will cost you $1.32. But this amount only covers the first ounce. 
Just like other envelopes, you need to buy additional stamps for every ounce other than the first one. Moreover, you can use any stamp mixture instead of Domestic Forever Stamps. But this stamp mixture must not cost you any less than $1.32. 

What Are Forever Stamps?

Whenever the question, “How many stamps do I need” arises, we hear the word Forever Stamp. These stamps are used in the US to send a letter or postcard. They are non-denominational. They don’t lose their value if there is a price change for any postal service. Also, these stamps never expire. The current price of a Forever Stamp is $0.66.

What are Semipostal Stamps?

The fundraising or “Semipostal” stamps include:
1. Breast Cancer Research Stamp 
2. Save Vanishing Species Stamp
3. Alzheimer’s Stamp
4. Healing PTSD Stamp 
The semipostal stamp will cost you $0.75. After deducting the reasonable postage fee, the USPS transfers the remaining amount to a selected agency to fund the mentioned causes. 

Do NetStamps Expire?

NetStamps are also used for sending direct mail. They work like any other regular stamp, but they never expire. They have their value printed on their face.

Where to apply Stamps on a Letter?

Postage stamps must be applied to the upper–right corner of the envelope. The address is also written here.


USPS offers a variety of options for postage stamps. Wherever you’re trying to send a postal mail, the question “How many stamps do I need?” will always cross your mind. And if you’re a business, the answer to this question will become essential. The prices of stamps change every year. It can be a challenge to keep up with the changing prices. This article is a 2023 guide answering the most asked question, “How many stamps do I need to send a letter?”

You can Read:

Leave a Comment

Your email address will not be published. Required fields are marked *