First-Class Mail and USPS Ground Advantage — Retail prices are charged as follows: First-Class Mail - Per ounce or fraction thereof; any fraction of an ounce is considered a whole ounce. For example, if a piece weighs 0.5 ounces, the weight (postage) increment is 1 ounce. ...
Still, since the latter is based on distance, customers usually spend less on first-class delivery than on priority mail. According to USPS, a 13 ounce, 9 x 12-inch envelope will be sent in first class in Pittsburgh by Wednesday afternoon and will arrive in Philadelphia, Pennsylvania, on S...
The postal rate for first-class mail is 41 cents for the first ounce or portion thereof and 17 cents for each additional ounce sor portion thereof up to 3.5 ounces.The cost in cents of first-class postage for a letter weighing N ounces (N≤3.5) is A.41+[N-1]*17B.[N-41]*17C....