What Are You Mailing?

Knowing the shape of your mail determines the price you will pay.
PostcardRectangular cardstock mailpiece not contained in an envelope
LetterSmall rectangular mailpiece no thicker than 1/4 inch
Large EnvelopeFlat rectangular mailpiece no thicker than 3/4 inch
PackageA three-dimensional mailpiece contained in a box, thick envelope, or tube, weighing up to 70 pounds
See rate charts.
Mailpiece Dimensions
SHAPE

LENGTH
HEIGHT
Postcard
minimummaximum
5 inch min.6 inch max.
3-1/2 inch min.4-1/4 inch max.
Letter(up to 3.5 ounces)
minimummaximum
5 inch min.11-1/2 inch max.
3-1/2 inch min.6-1/8 inch max.
Large Envelope
minimum*
11-1/2 inch min.
6-1/8 inch min.
Package
Weight cannot exceed 70 pounds.Length + girth (distance around the thickest part of the package) cannot exceed 108 inches. (Parcel Post cannot exceed 130 inches.)* Large envelopes exceed one or more letter-size maximum dimensions.
Some Shapes, such as tubes and square envelopes, may require additional postage. Postcards, letters, large envelopes and packages pay different prices.
Click-N-Ship® Services Click-N-Ship brings the Post Office to your desktop at home or at the office with no additional fees.
Print a shipping label-with or without postage. Delivery Confirmation is provided for all domestic Priority Mail packages sent via Click-N-Ship at no additional cost.
Carrier Pickup™The Postal Service makes shipping your packages quick and convenient. Carrier Pickup is available with Express Mail, Priority Mail, and international package services. Just prepare your package before your letter carrier arrives—including postage—and your letter carrier will pick it up for you.