The cost to mail a standard 1-ounce letter with the United States Postal Service (USPS) will increase to 78 cents starting July 13, 2025, up from the current 73 cents

. This is the price for a First-Class Mail Forever stamp, which covers the basic postage for mailing a letter domestically. If you want to send a Certified Mail letter, which provides proof of mailing and delivery, the cost is higher. For a 1-ounce letter, the postage is 69 cents (metered rate), plus a Certified Mail fee of $4.85. Additional services like Electronic Delivery Confirmation cost $0.95, and a Return Receipt (proof of delivery) can add $2.82 or $4.40 depending on the option chosen. The total for sending a 1-ounce Certified Mail letter with Electronic Delivery Confirmation is about $6.46

. In summary:

• Basic 1-ounce letter postage (First-Class Mail): 78 cents (effective July 2025)

• Certified Mail for 1-ounce letter: $0.69 postage + $4.85 Certified Mail fee + $0.95 electronic confirmation = approx. $6.46 total

These rates apply to domestic mail within the U.S. International letter rates start at $1.65 for 1-ounce letters