post office first class rates

post office first class rates are important for anyone looking to send mail or packages via the USPS First-Class Mail service. First-Class Mail is the most economical USPS option for lightweight items, such as letters, postcards, and small parcels. As of 2025, First-Class Mail prices start at $0.66 for a letter weighing up to 1 ounce. The cost increases with weight, with parcels up to 13 ounces being eligible for First-Class shipping. For heavier packages or quicker delivery, Priority Mail or other services may be more appropriate.