USPS Postage Stamp Guide: Everything You Need to Know
Weighing Mail and Determining Postage
To determine the postage required for your mail piece, follow these steps:
- Weigh the mail piece in ounces.
- Divide the weight by 0.16oz/piece.
Example
For a mail piece weighing 2 ounces, the calculation would be: 2oz / 0.16oz/piece = 12.5 pieces.
This means that 12 stamps would be required to send the mail piece.
Maximum Weight for First-Class Mail
- Letters: 35 ounces
- Large envelopes: 13 ounces
Cost of a First-Class Stamp
The cost of a first-class stamp varies depending on the weight of the mail piece. For letters weighing one ounce or less, one stamp is sufficient to mail up to five pieces.
Forever Stamps
Forever stamps are postage stamps that never expire. They can be used to mail letters regardless of future postage rate increases.
Buying, Using, and Storing Postage Stamps
Postage stamps can be purchased from the following locations:
- USPS post offices
- Authorized stamp vendors
- Online through the USPS website
To use a postage stamp, simply affix it to the top right corner of your mail piece.
To store postage stamps, keep them in a cool, dry place away from sunlight. Avoid extreme temperatures and humidity.
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