How Many Stamps Do I Need? The US Mail Postage Explained – Postalytics

How many stamps do you need?

Want to send an email, but don’t know how many stamps to buy? Postage can be confusing as the United States Postal Service (USPS) offers many different options.

such as direct mail automation & bulk mail service, we understand the importance of knowing your postage. postalotics is here to help answer your questions and determine which service is best for you.

In this article on postage stamps, we will introduce you to the characteristics of each of the USPS shipping services and the prices associated with them.

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How many postage stamps do I need to send a letter?

Two of the most frequently asked questions are: “How many stamps do I need to send a letter?” and “under what conditions do you need more than one stamp?”

answers depend on:

  • letter size
  • letter weight
  • class of service (eg, first class, certified, registered mail, etc.).< /li
  • the value of the stamps used

Let’s see how the necessary stamps work to send national letters, national envelopes, flat envelopes, national postcards and international letters.

Domestic shipping stamps

Domestic letter mailing – price per ounce

if you send a standard first class letter within the us. In the US, permanent domestic stamps cost 58 cents and offer delivery within 1 to 3 business days. the United States. The Postal Service last increased the price of permanent domestic stamps from 55 cents to 58 cents in 2021. The cost of mailing each additional ounce for your mailing increased from 15 cents to 20 cents.

forever stamps are postage stamps issued by the usps. they are non-denominational, which means they will always be worth the current postage rate. however, you must remember that the fee covers the first ounce. if your packet weighs more than an ounce, you will have to pay more per ounce.

let’s look at the postage you’ll have to pay for letters larger than one ounce with national forever stamps less than 3.5 ounces:

  • a 1 ounce letter – 1 national forever stamp costs 58 cents.
  • a 2-ounce letter – 1 national forever stamp and an additional 20-cent ounce stamp costs 78 cents.
  • a 3-ounce letter – 1 national forever stamp and two stamps additional 20-cent stamps – costs 88 cents.
  • a letter weighing 3.5 ounces – 1 national forever stamp, 1 postage stamp and a 10-cent stamp costs $1.08.

Note: Once your envelope exceeds the 3.5-ounce weight limit, you’ll need to check rates for “flat” mailers, which are large envelopes for 3.5- to 13-ounce mailings. Next, we’ll discuss the postage rates for plans, other requirements, and the costs of domestic envelopes.

requirements and costs of the national envelope

To send a letter in an envelope, you must follow specific rules. therefore, you should measure your envelope before purchasing.

These rules are as follows:

  • The dimensions of the envelope are more important than you think. It should be no larger than 11.5 inches by 6.125 inches, no more than ¼ inch thick, and should be of uniform thickness.
  • the envelope must be rectangular. square envelopes must be at least five inches in size, are considered “non-machinable” and are subject to an additional 21-cent postage charge. A “machinable” letter is one that can pass through the USPS classification systems without problems.
  • the envelope must be able to be folded. if it is not, it will be classified as “non-machinable” and you will have to pay an additional 21 cents.

Flats requirements and costs for flats

As mentioned above, “flats” (or large envelopes) are required for shipments weighing between 3.5 and 13 ounces. must meet the following requirements:

  • flat envelope dimensions must be at least 6.125 inches by 11.5 inches and no larger than 12 inches by 15 inches.
  • flat envelopes must have no more than 0, 75 inches thick.
  • bubble pack is not allowed because it makes it too thick.

How many stamps do I need for a large (flat) envelope? For example, for a 1-ounce flat, you could use one national permanent stamp, 1 × 10 cents, and one postage stamp, which would cost $1.08, or you could use 2 national permanent stamps and pay 8 cents more. You need to weigh the convenience of domestic forever stamps against the cost savings of using a combination of forever stamps, postage stamps and extra ounces. seals

national mailing of postcards

If you want to send a postcard within the United States, buying a postage stamp for 40 cents is cheaper than a domestic permanent stamp, which costs 58 cents.

The postcard must meet the following requirements to be eligible for this class of stamp:

  • Postcard dimensions must be at least 3.5 inches tall and 5 inches long. must be no more than 4.25 inches high and 6 inches long.
  • postcard must be rectangular.
  • The postcard must be at least 0.007 inches thick and no more than 0.016 inches thick.

international shipping letter postage

the easiest way to send letters from the usa. uu. to the UK is with global stamps forever, which will cost you $1.30. if you prefer to use domestic permanent stamps, make sure they add up to at least $1.30. You’ll pay more if your letter weighs more than an ounce, since global forever stamps only cover up to two ounces.

How many stamps do I need to send a package to the U.S.?

Calculating the postage of packages is much more complicated than calculating the cost of national letters. With parcel postage, you must take into account the weight and size of the package and the distance it is being shipped.

There are two ways to calculate how many stamps you need:

1. calculate postage at the post office

Packages may be too large to fit in a mailbox. therefore, you must take the package to the post office to send it, and there they will give you the price of the stamp.

2. using a postage calculator

The United States Postal Service has developed an online calculator that makes it easy for you to calculate postage in advance. To use it, you need to know the size, weight, and class of your mail. once you know this, enter the information into an online postage calculator to determine the cost of postage.

where to buy the stamps you need and shipping costs for 2022

there are several ways to buy stamps. you can buy them online from the usa uu. postal store or other online retailers, buy them at a post office, or buy them at a gas station, grocery store, or drug store.

Below is an overview of usps mail/shipping rates for 2022:


  • first class mail letter (1 ounce) $0.58
  • first class mail letter: each additional ounce $0.20
  • flat/large envelope for first mail class (1 ounce) $1.16
  • first class mail flat/large envelope – each additional ounce $0.20
  • postal $0.40

flat rate envelopes

  • Priority Mail Flat Rate Envelope $7.75
  • Priority Mail Legal Flat Rate Envelope $8.05
  • Priority Mail Padded Flat Rate Envelope $8.45
  • priority mail express flat rate envelope $23.50
  • priority mail express legal flat rate envelope $23.75

international mail & packages

  • first class mail international flat letters (1 ounce) $1.30
  • first class mail international flat letters (1 ounce) starting at $2.60


  • first class international parcel service – canada (1 pound) from $21.00
  • priority mail international (1 pound) – canada from $37.47
  • international mail priority flat rate envelopes – canada $28.13
  • priority mail international flat rate envelopes – canada $44.95

What happens if I don’t have the right amount of stamps?

If you don’t have a return address on the package and you don’t use enough stamps, the post office will try to collect postage from the recipient.

however, if they refuse to pay the postage and there is no return address, the package will be sent to “bailed letters”.

a better way to manage shipping costs

If you want to send a letter or postcard, make sure you put the correct address and stamps. you can then drop the letter in your mailbox, a blue collection box, or your local post office.

Using stamps can be tricky, but you don’t have to be frustrated. You can use the stamp cost guide above to calculate postage, or you can use the USPS postage calculator to determine the most economical combination of stamps for a letter or package.

Whether you’re sending a letter or a postcard, you can be sure that postalotics can help you organize your mail and provide you with the best postal rates on the market. You don’t need stamps with our online mail service because postage is included in our prices and our postcards and envelopes are pre-sealed.

It is more efficient to send standard sizes than special sizes that automated mail processing equipment cannot process.

If you use templates from Postalytics, you’ll enjoy the savings on postage that USPS offers and save yourself the headache of calculating and paying for postage. Contact us for more information on shipping costs or to discuss which option is best for you.

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