First-Class Mail Flats - USPS Retail | Rate Table


Effective January 9, 2022. Learn more about 2022 rates.

Click to View: USPS First-Class Mail Large Envelopes / Flats Rate Table

PDF Rate Table Available

A printable PDF version of this rate table is available at the end of this article.

USPS First-Class Mail Flats | Retail

What are First-Class Mail Flats Retail rates?

First-Class Mail

First-Class Mail is one of USPS's least expensive, most immediate options for mailing postcards, letters, large envelopes (flats), and parcels. Learn more about USPS domestic services.

First-Class Mail Flats are not eligible for tracking. If you need to mail a lightweight package that includes tracking, ShippingEasy recommends First-Class Mail Package Service.

Large Envelope / Flats

Large Envelope Flats is a special service within First-Class Mail. Flats are large envelopes smaller than 11.5" x 15" but larger than a regular envelope. Regular Envelopes are the standard business envelopes. This product range includes the popular No.10 envelope, which measures 9-1/2" long x 4-1/8" high.

Learn more about envelope dimensions.

Compare with First-Class Mail® Forever® Stamp

USPS offers Forever Stamps that value at the same price as a regular First-Class Mail stamp, regardless of the rate when you purchased it.

You can send 1 oz (about four sheets of regular, 8-1/2" x 11" paper in an envelope) anywhere in the U.S. Envelopes must be rectangular and made of paper to qualify for letter prices. Your envelope can be a maximum of 11-1/2" long x 6-1/8" high. You can fold what you put in your envelope, but it needs to stay flat—no more than 1/4" thick.

You can use two Forever Stamps if you need to send a package or a letter that weighs more than an ounce.

Anything weighing over 3 oz would cost $1.80 at the current value of a Forever Stamp and only $1.68 using First-Class Mail Large Envelopes / Flats.

Retail Rates

First-Class Mail rates are based on parcel weights and rate class.

Retail pricing is offered directly from the USPS at Post Office retail locations or It does not include discounts on postage prices like those received via ShippingEasy.

Learn more about USPS Retail pricing.

Compare with First-Class Mail Flats | Retail

USPS provides a multitude of services and rate classes. Check out these similar services and rates to see how they compare:


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