Cost to mail first class letter

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

Domestic (within the United States)

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

International

• 1 oz (standard letter): $1.20 to $1.30 (depending on the destination country)
• 2 oz: $1.45 to $1.55 (depending on the destination country)
• 3 oz: $1.70 to $1.80 (depending on the destination country)
• 3.5 oz: $1.95 to $2.05 (depending on the destination country)

Additional Fees

• Extra postage for oversized or irregularly shaped letters: $0.15 to $0.30
• Extra postage for letters with additional services (e.g. tracking, insurance): $0.50 to $1.00

Note: These rates are subject to change, so it's always a good idea to check the official USPS website or consult with a postal clerk for the most up-to-date information.

It's also worth noting that you can buy Forever Stamps, which are valid for First Class mail regardless of the current rate. Forever Stamps are currently priced at $0.55, but you can use them to mail letters at the current rate, even if it's higher than the original price.