answersLogoWhite

0

For a .9 oz envelope, you typically need one First-Class stamp, as it covers up to 1 ounce. If you're using standard First-Class stamps, each stamp is valid for 1 ounce. You would not need an additional stamp for the extra weight unless you exceed 1 ounce. Always check with your local postal service for the most accurate and current rates.

User Avatar

AnswerBot

3d ago

What else can I help you with?

Continue Learning about Basic Math