us postal service letter weight

us postal service letter weight directly influences postage cost, delivery speed, and handling. Standard First-Class letters must weigh under 3.5 ounces and meet size requirements for flat rate pricing. If us postal service letter weight exceeds limits, postage rates increase and different classifications apply. It’s essential to weigh letters accurately before mailing to avoid delays or returned items. Businesses should use digital scales and USPS tools to streamline bulk mailing operations. Understanding letter weight thresholds helps reduce costs and ensures smooth delivery across domestic and international mail networks.