How Much Postage for Square Envelope ?

Square envelopes are mostly used for advertising, Greeting cards, and invitations. Square Envelopes have their unique shape, Look modern, and more durable than other envelopes. Square Envelope, Oversized, or unusually shaped envelope will cost you an extra $0.20 per letter. For a 1oz standard Envelope or Rectangular Envelope, normally it requires a $0.55 stamp. Letters which are Squared type considered as Odd Sized, which results in higher prices for Postages. Above are the standard USPS postage rates. You can see more updated rates on their official site as well. So addition of Extra 20 cents, Square envelope total cost will be ( $0.20 + $0.55 = $0.75 ) even if they weigh less than 1 oz or equal to 1oz.For 2oz Square Envelope letter its will be ($0.75 + $0.20 = $0.95).For 3oz Square Envelope letter its will be ($0.95 + $0.20 = $1.15).