Cost to mail square envelope

The cost to mail a square envelope depends on the size, weight, and destination of the envelope, as well as the type of mail service used. Here are the current rates for square envelopes in the United States:

First-Class Mail

• Square envelopes up to 1 oz (0.5 oz or less):
  • Domestic: $0.55 (flat rate)
  • International: $1.20 (flat rate)
• Square envelopes over 1 oz (0.5 oz or more):
  • Domestic: $0.65 (per ounce)
  • International: $1.30 (per ounce)

Priority Mail

• Square envelopes up to 1 oz (0.5 oz or less):
  • Domestic: $7.50 (flat rate)
  • International: $24.50 (flat rate)
• Square envelopes over 1 oz (0.5 oz or more):
  • Domestic: $7.50 (flat rate) + $0.20 per ounce
  • International: $24.50 (flat rate) + $0.30 per ounce

Priority Mail Express

• Square envelopes up to 1 oz (0.5 oz or less):
  • Domestic: $25.50 (flat rate)
  • International: $44.50 (flat rate)
• Square envelopes over 1 oz (0.5 oz or more):
  • Domestic: $25.50 (flat rate) + $0.20 per ounce
  • International: $44.50 (flat rate) + $0.30 per ounce

Special Services

• Certified Mail: Add $3.45 (domestic) or $6.45 (international) to the base rate.
• Return Receipt: Add $1.45 (domestic) or $2.45 (international) to the base rate.

Keep in mind 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.