How much to mail first class letter

The cost to mail a First-Class letter in the United States depends on the weight and size of the letter, as well as the destination. Here are the current rates for First-Class Mail letters:

Domestic (within the United States)

• 1 oz (1 ounce) letter: $0.55
• 2 oz letter: $0.70
• 3 oz letter: $0.85
• 3.5 oz letter: $1.00

International

• 1 oz letter to Canada: $1.20
• 1 oz letter to Mexico: $1.20
• 1 oz letter to other countries: $1.30

Additional ounces

• Each additional ounce: $0.15

Special rates

• Letters to APO/FPO/DPO addresses: $0.55 (1 oz) to $1.00 (3.5 oz)
• Letters to U.S. territories (e.g. Puerto Rico, Guam): $1.20 (1 oz) to $1.30 (3.5 oz)

Please note that these rates are subject to change, so it's always a good idea to check the official USPS website or consult with a postal worker for the most up-to-date information.

Also, keep in mind that these rates apply to standard letters, which are defined as:

• Rectangular in shape
• At least 3.5 inches high and 5 inches long
• No more than 6.125 inches high and 11.5 inches long
• No more than 1/4 inch thick

If your letter is larger or heavier than these dimensions, you may need to use a different type of mail service, such as Priority Mail.