How many stamps to mail a 4 oz envelope

The number of stamps needed to mail a 4 oz envelope depends on the destination and the type of mail service used. Here are the current rates for First-Class Mail:

• For a 4 oz envelope sent within the United States:
  • 1 ounce: 1 stamp (currently $0.55)
  • 2 ounces: 2 stamps (currently $1.10)
  • 3 ounces: 3 stamps (currently $1.65)
  • 4 ounces: 4 stamps (currently $2.20)
• For a 4 oz envelope sent to Canada:
  • 1 ounce: 1 stamp (currently $1.20)
  • 2 ounces: 2 stamps (currently $2.40)
  • 3 ounces: 3 stamps (currently $3.60)
  • 4 ounces: 4 stamps (currently $4.80)
• For a 4 oz envelope sent to other international destinations:
  • 1 ounce: 1 stamp (currently $1.20)
  • 2 ounces: 2 stamps (currently $2.40)
  • 3 ounces: 3 stamps (currently $3.60)
  • 4 ounces: 4 stamps (currently $4.80)

Keep in mind that these rates are subject to change, so it's always a good idea to check the current rates on the USPS website or at your local post office.

In your case, since you have a 4 oz envelope, you would need 4 stamps to mail it within the United States, or 4 stamps to mail it to Canada, or 4 stamps to mail it to other international destinations.