First Class Mail is the most popular way to send items through USPS. You can send standard postcards, letters and large envelopes and small packages up to 15.99 ounces using First Class Mail. If your First Class package is over 15.99 ounces, you must upgrade the mail class to Priority Mail.
While there are no guaranteed delivery times for First Class Mail, letters or packages typically take two to three days to arrive at their final destination in the U.S.
How Does First Class Mail Work?
USPS has size restrictions for items sent with this service as shown below:
|Mail Item||Width||Length||Weight||First Class Rate - 1 oz.|
|Postcard||4.5″ max||6.00″ max||Up to 1 oz||$0.35|
|Letter||6.125″ max||11.5″ max||Up to 1 oz||$0.55|
|Metered Letter||6.125″ max||11.5″ max||Up to 1 oz||$0.50|
|International Letter||6.125″ max||11.5″ max||Up to 1 oz||$1.15|
|Each Additional Ounce||$0.15|
Large envelopes and small packages can be sent through First Class Mail as long as you’ve met USPS’s weight restrictions. It costs $1.00 to send the first ounce of a large envelope and $2.66 for the first 3 ounces of a small package. Letters that can’t be sent through the Post Office’s automated machines have a $0.21 postage surcharge; the shape of the letter determines whether or not it is subject to this surcharge or not.
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