Figure Out How Many Stamps to Mail a Letter in 2026

A single Forever stamp still mails a one ounce letter in 2026, and that one fact answers how many stamps to mail a letter for most people. The trouble starts the second your envelope drifts past that first ounce. A birthday card with a short note is fine. Three printed pages, a photo, and a padded envelope are not.

The Postal Service raised prices on July 12, 2026, so these numbers are current. A First Class Mail Forever stamp costs $0.82 and covers your first ounce, per USPS. Every ounce after that adds 29 cents. Weigh the sealed envelope first and the guessing goes away.

How many stamps to mail a letter in 2026

For a standard letter, count in ounces, not pages. One Forever stamp carries up to one ounce. A two ounce letter needs $1.11, which is one Forever stamp plus a single 29 cent additional ounce stamp. If you think in grams like most of the world, our grams to ounces converter turns 28 grams into that first ounce.

One Forever stamp covers a standard letter up to one ounce. Add 29 cents for each ounce after that, and remember the Postal Service rounds any fraction up to the next whole ounce.

So how many stamps do I need for a normal letter? Read the table by weight. Working out how many postage stamps you need comes down to one number on a scale, not the page count. With only Forever stamps on hand, two cover any letter up to three ounces, so how many stamps needed for everyday mail rarely tops two.

What one ounce of mail actually looks like

One ounce is lighter than it feels. A standard 20lb letter-size sheet weighs about 4.5 grams, according to published paper weight tables, and an empty #10 business envelope adds roughly 6.75 grams. Stack six sheets in that envelope and you are already brushing the one ounce line at about 28 grams.

The one ounce line most people miss

Most letters that need extra postage do so by accident. A greeting card printed on heavy stock, a second insert, or a folded photo can push a light envelope over the edge without looking any thicker. That is why a quick weigh beats a visual guess every time.

Six sheets of ordinary printer paper plus a business envelope land right at about one ounce, the exact point where a second stamp starts to matter.

How much does it cost to mail a letter this year

How much does it cost to mail a letter depends entirely on weight and shape. For a plain letter the first ounce is $0.82 with a stamp, or $0.78 if you print metered postage online. The additional ounce stamp cost is a flat 29 cents, and the 2026 rate change kept that per ounce price steady across letters.

Shape matters as much as weight. A postcard mails for $0.65, while a large envelope, the flat 9 by 12 kind, starts at $1.19 for the first ounce. The Forever stamp price of $0.82 only applies to letters that stay within standard size, so an oversized envelope jumps to the flat rate even at the same weight.

How many stamps per ounce after the first

There is no separate stamp for every weight. How many stamps per ounce you add is simple, one 29 cent additional ounce stamp for each ounce past the first, up to the letter limit. Buy a small sheet of those once and you stop overpaying for years.

How to weigh a letter before you buy stamps

You do not need a post office scale at home. A phone with a weight estimate app, a kitchen scale, or even the same trick people use for luggage will get you close. Our guide on weighing bags without a scale uses the same balance idea on a smaller scale.

Turning grams into stamps

Once you have a gram reading, the stamp count falls out fast. Anything up to 28 grams is one stamp. Up to about 57 grams is two ounces of postage, and up to 85 grams is three. Flip a metric number back with our ounces to grams tool if your scale only shows ounces.

What overpaying on postage really costs you

Here is where the money hides. Most people fix a heavy letter by slapping on a second Forever stamp, which spends $0.82 to solve a 29 cent problem. On a single card that is pocket change. On a month of bills, invoices, and thank you notes, the waste is real.

Say you mail 40 slightly heavy letters a year and reach for a spare Forever stamp each time. That is $32.80 in postage where $11.60 in additional ounce stamps would have done the job. Weighing first, or checking grams with our weight converter, keeps that $21 in your pocket.

Stacking a second Forever stamp on a 1.1 ounce letter hands the Postal Service 53 extra cents. Over a year of bills and cards, that quietly adds up.

Common questions about mailing a letter

How many postage stamps do I need for a heavy letter?

Weigh it, then count ounces. A letter up to two ounces takes $1.11, or one Forever stamp plus a 29 cent additional ounce stamp. Up to three ounces is $1.40, and the letter limit of 3.5 ounces runs $1.69. Past that weight you are into large envelope or package rates.

How much is a Forever stamp right now?

As of the July 2026 prices, one Forever stamp is $0.82 and covers a standard letter up to one ounce. It stays valid for that first ounce even after future price increases, which is the point of the Forever name. Metered postage bought online is a little cheaper at $0.78.

What is the First Class letter weight limit?

The First Class letter weight limit is 3.5 ounces, or about 99 grams. Above that a mailpiece is treated as a large envelope or a package, with higher rates. If your envelope is close, weigh it, because USPS rounds any fraction of an ounce up to the next whole ounce.

How many stamps for a letter with extra pages?

Count roughly six sheets of standard paper per ounce, envelope included. One to six sheets is a single stamp, seven to twelve sheets usually needs two ounces of postage, and a thick stack keeps climbing by 29 cents an ounce. When in doubt, how many stamps for a letter is best answered by the scale, not a headcount.

Need to know how many stamps to mail a letter without a trip to the post office? Point your phone at the envelope and Scale for Grams gives you an AI weight estimate in grams and ounces in seconds, so you buy the right postage the first time. Get the app here: iOS.