Cost to mail large envelope first class

The cost to mail a large envelope (also known as a flat rate envelope) First Class Mail in the United States depends on the weight and dimensions of the envelope. Here are the current rates from the United States Postal Service (USPS):

Flat Rate Envelopes

• Large Flat Rate Envelope (12 1/2 x 15 1/2 inches): $13.75
• Extra Large Flat Rate Envelope (15 x 18 inches): $18.75

Weight-Based Pricing

• For envelopes weighing 1 ounce or less:
  • Small envelope (up to 6 1/8 x 11 1/2 inches): $0.92
  • Medium envelope (up to 11 1/2 x 15 1/2 inches): $1.22
  • Large envelope (up to 15 1/2 x 18 1/2 inches): $1.42
• For envelopes weighing more than 1 ounce:
  • Small envelope (up to 6 1/8 x 11 1/2 inches): $1.22 (1-2 ounces), $1.42 (2-3 ounces), etc.
  • Medium envelope (up to 11 1/2 x 15 1/2 inches): $1.52 (1-2 ounces), $1.72 (2-3 ounces), etc.
  • Large envelope (up to 15 1/2 x 18 1/2 inches): $1.82 (1-2 ounces), $2.02 (2-3 ounces), etc.

Additional Fees

• If your envelope is oversized or irregularly shaped, you may need to use a special oversized envelope or a package, which can increase the cost.
• If you want to add extra services, such as tracking or insurance, you'll need to pay an additional fee.

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