usps postal rates first class

usps postal rates first class depend on the weight, size, and destination of the package or envelope. First-Class Mail is ideal for small items under 13 oz and typically delivers within 1–5 business days. Rates are calculated by ounce and zone, with discounted pricing available for commercial users or businesses using USPS-approved software. First-Class is a cost-effective option for lightweight domestic and international shipments.