How much postage to mail a square envelope

The cost of postage for a square envelope depends on the size, weight, and destination of the envelope. Here are the current USPS rates for square envelopes:

Domestic Mail

• Square envelopes up to 1 oz (0.5 oz or less) and up to 5 1/2 x 5 1/2 inches:
  • First-Class Mail: $0.55
  • Priority Mail: $7.50 (free shipping insurance up to $50)
• Square envelopes over 1 oz (0.5 oz or more) and up to 5 1/2 x 5 1/2 inches:
  • First-Class Mail: $0.70
  • Priority Mail: $8.50 (free shipping insurance up to $50)
• Square envelopes over 5 1/2 x 5 1/2 inches:
  • First-Class Mail: $1.00
  • Priority Mail: $10.50 (free shipping insurance up to $50)

International Mail

• Square envelopes up to 1 oz (0.5 oz or less) and up to 5 1/2 x 5 1/2 inches:
  • First-Class Package International Service: $1.20
  • Priority Mail International: $24.95 (free shipping insurance up to $200)
• Square envelopes over 1 oz (0.5 oz or more) and up to 5 1/2 x 5 1/2 inches:
  • First-Class Package International Service: $1.40
  • Priority Mail International: $29.95 (free shipping insurance up to $200)
• Square envelopes over 5 1/2 x 5 1/2 inches:
  • First-Class Package International Service: $1.60
  • Priority Mail International: $34.95 (free shipping insurance up to $200)

Please note that these rates are subject to change, and you should always check the USPS website for the most up-to-date rates and fees. Additionally, if your envelope is oversized or irregularly shaped, you may need to use a special rate or consult with a USPS representative for guidance.