US 1st Class Postage Rate Overview
The United States Postal Service sets the base rate for a 1 oz First Class letter at $0.68 as of the latest published price list. The rate applies to rectangular letters meeting size and thickness standards. Additional ounces are charged at a per-ounce increment, and large envelopes or flats have a separate pricing tier. USPS adjusts rates annually, with the most recent changes taking effect in early January. For the exact current price, refer to the official USPS price list page USPS Price List.
Compared to other major carriers, USPS First Class Mail remains the lowest-cost option for lightweight letters and small packages. UPS and FedEx typically charge more for standard letter-sized envelopes under 1 oz, especially for residential delivery. The Postal Regulatory Commission oversees rate changes and approves annual requested increases. USPS remains the only carrier with universal delivery to every address in the United States. Competitive alternatives like postage rate comparisons on Forbes confirm USPS First Class as the most affordable standard letter service.
First Class Mail Types and Delivery Standards
Letters, Large Envelopes, and Parcels
First Class Mail includes letters, large envelopes, and small parcels up to 13 oz. Letters must be between 3.5 and 6.125 inches high, 5 and 11.5 inches long, and no more than 0.25 inches thick. Large envelopes, or flats, must be at least 6.125 inches high by 11.5 inches long and no more than 12 inches long by 15 inches wide. Parcels in the First Class range must weigh 13 oz or less and meet specific thickness and girth limits. Each category has a distinct per-piece price, with letters being the least expensive and parcels the most costly within the First Class tier.
Delivery standards for First Class Mail are among the fastest in the industry. The USPS aims for local delivery within 1 business day and nationwide delivery within 3 business days. The Postal Service reports First Class Mail on-time performance quarterly in its delivery statistics. Delays can occur due to weather, volume surges, or address errors. For real-time tracking on eligible items, USPS provides tracking through Informed Delivery and text alerts. Learn more about delivery standards at the official USPS service standards page USPS Service Standards.
Key Factors Affecting Postage Costs
Weight, Size, and Shape
Weight is the primary driver of First Class postage cost. A 1 oz letter costs the base rate, and each additional ounce adds a fixed charge. Size matters because letters outside the standard dimensions are classified as flats or large envelopes, which cost more. Square or rigid envelopes may incur additional surcharges due to manual processing requirements. The shape of the mailpiece also affects automation compatibility and delivery speed.
Businesses sending high volumes of First Class Mail can access discounted rates through USPS Commercial Pricing. The cost difference between retail and commercial pricing grows with volume, making it essential for direct mail campaigns. Companies like Tesla and SpaceX use commercial mailing services for customer correspondence and regulatory filings. The SEC requires public companies to file certain disclosures electronically, but paper mailings still rely on First Class rates for shareholder communications. Explore commercial pricing details at USPS Commercial Pricing.