How much extra postage is required for a square envelope, and how many stamps do you need?

Click to see the full answer.How many stamps is required when an envelope says extra postage is needed?

If your domestic mail piece weighs more than one ounce, you must include additional postage with yourforever stamp to ensure USPS delivery.You can purchase postage stamps with higher denominations at the Post Office.For heavier mail, place twoforever stamps on a mail piece.

Can I use 2forever stamps for extra postage?If you need to send a package that weighs more than an ounce, you can use a second stamp.The current first-class rate is what each stamp is worth.If you paid $0.49 and the rate goes up to $0.50, you can put two forever stamps on a package to get a dollar worth of postage.

To be eligible for the standard letter rate and envelope, it has to be more than 6.125 inches in height by 11.5 inches and have a thickness greater than 0.25 inches.Extra postage will be incurred for anything that exceeds these dimensions.

You can mail 4-5 pages of regular paper and an envelope for the regular first class rate.The cost of heavier paper, rigid or oversized envelopes will go up.For the two ounce rate, you can get about 10 pages of standard page weight and an envelope.