us postal service weight price refers to the cost of mailing packages based on their weight. USPS uses weight as one of the factors to calculate shipping rates for various services, such as Priority Mail, First-Class Mail, and Parcel Select. Businesses shipping products via USPS must understand the weight-based pricing structure to accurately estimate costs and offer competitive shipping options to customers. Accurately weighing packages and choosing the right USPS service helps businesses avoid overpaying for shipping and ensures that customers receive fair prices.