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How many stamps do I need to send letters within the United States?

Do you need to know how many stamps to put on a letter? Wondering what the postage rate is for a letter going within the United States? Here’s everything you need to know about mailing letters in the U.S.!

How many stamps do I need?

You need only two stamps, one for the first ounce of weight (the letter plus its envelope) and another that covers any additional ounces.

To determine how many stamps you need, take the length (in inches) of your letter and divide it by two. Take that number and round up to find out how many stamps you’ll need on the front of the envelope. 

Here are some examples:

A 4-inch by 6-inch postcard requires four stamps.

A 5-inch by 11-inch letter requires six stamps.

A 9-inch by 12-inch manila envelope requires 10 stamps. (You might need additional postage if the location is far away.) 

What is the postage rate?

Currently, it costs 46 cents to mail a letter (up to 1 ounce), regardless of where you are sending it. There is no need to use additional stamps if your letter

How much is a first-class stamp?

The current first-class postage rate is 49 cents. However, there are other rates for shipping if you need it to get there faster! Check out different websites for more information on shipping methods and prices.  

What is the postage rate for a letter going within the United States?

The postage rate for a First-Class Letter is 49 cents. 

Can I mail letters with postcards?

Yes! Postcards are considered to be one ounce, so you can use either two stamps or one stamp and one postcard to cover the cost of mailing a postcard.

What is the postage rate for a letter going Internationally?

The current postage rate for international letters (including postcards) is $1.15, but some countries will accept First-Class Mail International if it’s under 13 ounces and marked “Postcard.”

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How many ounces are in a letter?

The Postal Service uses ounces to measure size, not weight. One ounce is not the same as one pound! A First-Class Letter can be up to 3.5 inches high, 5 inches long, and 0.007 inches thick.

What is the price of a stamp in the United States (domestic mail)?

The price of a stamp in the United States is $1.05 for letters up to 1 ounce, and $0.85 for each additional ounce. For example, if you’re sending something that weighs 3 ounces, it would cost you $3 in postage (or $2 less than what it would’ve normally cost).

What is the size and weight limit for letters sent within the United States (domestic mail)?

A First-Class Mail letter can be no more than 6 inches long, 12 inches high, and 0.016 inches thick. That’s about as thick as a dollar bill! The weight limit is 3.5 ounces. If it weighs more, you have to use another shipping method, such as Priority Mail or Parcel Post.

What are some common services that are included with domestic mail delivery in the United States? 

In the United States, you can get your mail delivered to a P.O. Box, a Post Office, or your home address for free! There are also several other paid shipping methods that offer additional services such as certified and automation postage.

How can I track my letter after it has been sent within the United States?


To track the progress of your letter, you will have to visit the United States Postal Service tracking page. Use Google Maps to find a location near you that is open 24 hours a day so that you can easily check on your letter’s status throughout the day. You may also want to add the tracking page to your bookmarks in Google Chrome.

How long will it take for my letter to be delivered in the United States?

The time it takes for your letter to reach its destination depends on how far away you are from where you sent the letter. For example, if you send a letter within New York City and your recipient is in California, it might take a couple of days for the letter to be delivered. But if you send a letter from New York City to New Jersey, it will probably only take a day or two for your recipient to receive it.

Benefits of using stamps to send letters within the United States:

  • Cheaper than other shipping methods.
  • Letters with stamps are delivered more quickly than those with return address labels or custom postage.
  • You can purchase your stamps at post offices, grocery stores, and pharmacies!
  • Letters sent with custom postage are delivered more quickly than those with stamps
  • Letters sent with custom postage can be tracked online. 
  • You don’t have to wait in line at the post office, and you can avoid having to buy large amounts of stamps. 

Our verdict:

The verdict is in! Stamps and postcards are the best way to send letters within the United States (domestic mail)!

NOTES: The Post Office does not recommend using the Priority Mail envelope as a letter envelope, but our tests showed that it worked fine. As long as you don’t print on envelopes too many times with your laser printer, you should be fine. Also, the Post Office recommends that all letters in the United States (domestic mail) weigh no more than 3.5 ounces. They say that letters weighing over 3.5 ounces must be sent with Priority Mail or Parcel Post instead of First Class Mail! 

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