Large envelope postage, ounce by ounce

Large envelope postage for a flat piece up to 13 ounces: choose “Large envelope”, enter the weight and see the price and the stamps.

Independent site, not the Postal Service: prices read in its own price files.

A sheet of paper weighs about 0.2 oz; weigh it if unsure

More details (optional)Already filled in: nonmachinable No
Square, rigid or lumpy?

Example: a 5 oz large envelope· change a figure to see yours

Large envelope postage

$2.85

4 Forever stamps ($0.82 each), $0.43 overpaid

One Forever stamp (1 oz letter)$0.82
Each extra ounce of a letter$0.29
Price on January 17, 2027$2.85 (stamps do not change)
How this is computed

Compiled by Radif Partners · How the prices are built

Large envelope postage applies to First-Class Mail pieces larger than a letter that stay flat and flexible, up to 13 ounces; the Postal Service also calls them flats. In the Notice 123 retail sheet read on November 13, 2026, the price starts at $1.69 for 1 ounce and rises with each ounce, by $0.29 at first, to $5.24 at 13 ounces. These prices did not change with the holiday price change of October 2026, which covered shipping products only, and the January 2027 filing makes no change to them either. A large envelope must bend: a rigid or lumpy envelope is charged as a package. For anything over 13 ounces, USPS Ground Advantage takes over, from $8.40 for 8 ounces in zone 1 at a counter. Documents that must arrive in 2 to 3 days can go in the Priority Mail Flat Rate Envelope, $13.90 whatever they weigh.

Large envelope postage from 1 to 13 ounces

First-Class Mail retail, Notice 123. No change filed for January 2027.
WeightPrice todayJuly 2026
1 oz$1.69$1.69
2 oz$1.98$1.98
3 oz$2.27$2.27
4 oz$2.56$2.56
5 oz$2.85$2.85
6 oz$3.14$3.14
7 oz$3.43$3.43
8 oz$3.72$3.72
9 oz$4.02$4.02
10 oz$4.32$4.32
11 oz$4.62$4.62
12 oz$4.93$4.93
13 oz$5.24$5.24

The price climbs steadily, so the weight matters more than the size of the envelope. A thick report of 6 ounces in a large envelope costs $3.14. Split into two letters of 3 ounces each it would cost $2.80, less, but the pages travel separately and may not arrive the same day.

Postage for your large envelope

Example: a 5 oz large envelope· change a figure to see yours

Large envelope postage

$2.85

4 Forever stamps ($0.82 each), $0.43 overpaid

One Forever stamp (1 oz letter)$0.82
Each extra ounce of a letter$0.29
Price on January 17, 2027$2.85 (stamps do not change)
Full calculator: How much is a stamp →

Flat, flexible, under 13 ounces

Three checks keep a piece in the large envelope price. It must be larger than a letter, so a standard business envelope is a letter, not a flat. It must stay flat and bend: a padded mailer with a box inside, a binder or a thick booklet that will not flex is a package. And it must weigh 13 ounces or less; one more ounce and Ground Advantage applies.

Stamps or a label

Forever stamps work on a large envelope, but they rarely match the price, as the stamps calculator shows. A counter weighs the piece and prints the exact postage. For legal papers that need a proof of mailing and delivery, add Certified Mail, priced on the Certified Mail page.

Questions people ask before they mail

Tap a question to see the answer.

What counts as a large envelope for USPS?

A flat, flexible piece bigger than a letter, up to 13 ounces, as usps.com describes First-Class Mail large envelopes. A full-size document envelope with papers inside is the usual example. If it is stiff, uneven or thicker than a flat piece, the Postal Service charges it as a package, which costs more.

Is a large envelope cheaper than a package?

Yes, while it stays flat. An 8-ounce large envelope costs $3.72; the same 8 ounces as a Ground Advantage package cost $8.40 in zone 1 and $10.20 in zone 8 at a counter. The package adds tracking and $100 of insurance, which the large envelope lacks.

Can I track a large envelope?

Not with First-Class Mail alone: usps.com notes that tracking is not included for letters and large envelopes unless you buy certain extra services. Certified Mail adds a mailing receipt and a delivery record. For tracking and insurance included, send it as a Ground Advantage package or in a Priority Mail Flat Rate Envelope.

Next steps

How many stamps do I need

Forever stamps for a letter or a large envelope by weight, and what you overpay.

How much is a stamp

The Forever stamp, the extra ounce, the postcard and the square envelope, and 2027.

Certified Mail cost

Postage, the Certified fee and the return receipt added up, for a letter or an envelope.

Ground Advantage rates

The cheapest USPS package service, priced by ounce step and pound, zone 1 to 9.

Postal Service price files, manual chapters and filings behind this page (4)

Each price, rule and zone was read in these documents on November 13, 2026.

Compiled by

Independent publisher of US parcel price tables built from the Postal Service's Notice 123 price files and its domestic zone chart. Paid by no carrier: no commission, no affiliate link, no paid placement.

Checked on · Editorial policy · Contact

Prices are read from the Postal Service price files, never estimated. They leave out pickup, special handling, hazardous material and any extra service you add at the counter. The January 17, 2027 prices are proposed and await review by the Postal Regulatory Commission.