To determine single-piece weight in any mailing of nonidentical-weight pieces, weigh each piece individually. First-Class Package Service – Retail - Based on weight and zone 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. First-Class Mail - Per ounce or fraction thereof any fraction of an ounce is considered a whole ounce.The First-Class Package Service - Retail parcel price applies to parcel-size pieces under 101.3.0 and to flat-size pieces that do not meet the standards in 101.2.0.ġ.2 Price Computation for First-Class Mail and First-Class Package Service - Retailįirst-Class Mail and First-Class Package Service - Retail prices are charged as follows:.The flat price applies to flat-size pieces that meet the standards in 101.2.0.There are separate prices for stamped letters and for letters with metered postage affixed (Metered Mail price). The letter price applies to letter-size pieces meeting the standards in 101.1.1 and weighing 3.5 ounces or less, and that are not eligible for the card price.The card price applies to a card meeting the standards in 101.6.2.The single-piece prices are applied as follows: USPS Marketing Mail Eligibility Decision Treeġ30 Retail Mail First-Class Mail and First-Class Package Service - Retail 133 Prices and EligibilityĢ.0 Basic Eligibility Standards for First-Class Mail and First-Class Package Service - Retailģ.0 Content Standards 1.0 Prices and Fees 1.1 First-Class Mail Single-Piece and First-Class Package Service - Retail Price Application.Designing Letter and Reply Mail (PUB 25).

Usps firstclass flat