How do I know if my envelope needs extra postage?

Customers must affix additional postage when mailing letters weighing in excess of 1 ounce and/or letters subject to the nonmachinable surcharge or mailpieces subject to another rate of postage (e.g., large envelopes or packages).

What size envelopes require additional postage?

Jun 24, 2021•Consumer Knowledge

For example, a square envelope requires additional postage. To meet the standard envelope requirements for using only one Forever Stamp, the envelope needs to be a minimum of 3.5 inches in height by 5 inches in length and the thickness must be a minimum of 0.007 inches.

Do 5X7 envelopes require extra postage?

Does a 5X7 Envelope Require Extra Postage? A rectangular 5×7 envelope is the standard size that is used in the United States for mailing letters and invitations, so if your envelopes are within the weight range of 1 oz, then you will only need to pay $. 47 for each one without any additional charge.

Does a 6×9 envelope require extra postage?

The 6×9 envelope of weight up to one ounce requires one first class stamp and the sender of envelope will have to pay extra charges for the envelope for the additional ounces. The current cost of a single first class postage stamp is $0.55 and for every single addition in the ounces the sender will pay $0.20 per ounce.

Does a 6×6 envelope require extra postage?

Is there extra postage on square envelopes? YES. According to, for an envelope to be eligible for mailing at the price for letters, a piece must be: Rectangular.

Does a square envelope require extra postage?

Square envelopes will cost you an extra $0.30 per letter in addition to the postage required for the weight and dimensions of your envelope. For 1 oz letters this means you’ll need a $0.88 stamp (instead of a $0.58 stamp) and for wedding invitations that weigh 2oz you’ll need a $1.08 stamp (instead of a $0.78 stamp).

Can I mail a padded envelope with stamps?

If your bubble mailer is considered an envelope and weighs 1 ounce or less, you can slap a $0.55 forever stamp on your mailer and drop it off at your post office as usual. If your bubble mailer is considered a package, you’ll choose between USPS First Class, USPS Retail Ground, Priority Mail and Media Mail.

Is a padded envelope considered a package?

Bubble Mailers and Envelopes are Considered Packages When They’re 3/4 Inches Thick or More. USPS will only accept bubble mailers as packages if their total thickness is 3/4 of an inch or more. This applies not when the bubble mailer is empty, but when the contents of your shipment are inside.

How much does it cost to mail a 5×7 envelope in 2021?

for postage purchased at the Post Office is NOT INCREASING in 2021, remaining at $0.55. Each additional ounce for First Class Mail will cost $0.20, a five cent increase from 2020. If you print postage online (via, the Metered Mail rate (1 oz.) will increase by one cent to $0.51 in 2021.

How many stamps do I need for a 2 oz padded envelope?

3 standard postage stamps or two oversized envelope stamps would be required to cover the cost of postage. The postage rate for the manila envelope is $1.00 for the first Ounce and $0.15 for every additional Ounce. You are wondering it’s a similar case as a legal-size envelope and a 9 by 12 envelope, so you are right.

How many stamps do I need for a 3 oz padded envelope?

At the current rates, a 3-ounce letter costs $0.98, and requires 1 Forever Stamp and 2 additional ounce stamps. Larger envelopes weighing 3 ounces cost $1.56 to mail, and require 1 Forever Stamp and 1 3-ounce stamp.

How thick can an envelope be?

Sizes for Letters
Height3-1/2 inches6-1/8 inches
Length5 inches11-1/2 inches
Thickness0.007 inch1/4 inch

How many stamps do I need for a 9×12 padded envelope?

Large envelopes. This includes 9×12, legal, and manila envelopes, Two stamps are needed for the first ounce, and postage will be an additional $0.20 cents after.

Does a padded envelope cost more to mail?

This is because padded envelopes cost $0.55 in additional postage. You paid for a Flat Rate Envelope (the $6.55 option) but used a Padded Flat Rate Envelope, which costs $7.10. This is tricky, as padded envelopes say “Flat Rate Envelope” in large font and only include “Padded” in small text next to the barcode.

How much does it cost to mail a 2 oz padded envelope?

Postage rates for Priority Mail Flat Rate products will increase in 2020. The popular Priority Mail Flat Rate Padded Envelope will cost $7.75 in 2020 compared to $7.55 currently, a $0.20 increase. Rates for the Priority Mail Medium Flat Rate Box will increase 40 cents, to $13.20 from $12.80 currently.

How many stamps do I need for a 9 by 13 envelope?

Smaller sizes (e.g. 5 x 7 and 6 x 9) weighing less than 1 ounce only require 1 Forever Stamp, while heavier envelopes require additional ounce stamps in 2022. Larger manila envelopes (e.g. 9 x 12) are classified as flats, and start at $1.16 for 1 ounce. Two Forever Stamps cover this amount of postage.

Is a 9×12 envelope considered a large envelope?

Large Envelopes (Flats)

The maximum size for large envelopes is 15″ x 12″ x 3/4″ thick. The maximum weight for large envelopes is 13 ounces. A large envelope exceeding 13 ounces is classified as a Priority Mail item.

How much does it cost to mail a 12 oz large envelope?

Single Piece First Class Letter Rates
WeightLarge EnvelopesPackages
10 ounces$2.96$5.50
11 ounces$3.16$5.50
12 ounces$3.36$5.50
13 ounces$3.56$6.25

How many stamps do I need for 10 ounces?

How many stamps do I need for a large envelope (flats) to the United States?
10 ounces ($2.96)Five Domestic Forever stamps, one 5¢ stamp, and one 1¢ stamp ($2.96) Or you can overpay by $0.52 using six Domestic Forever stamps ($3.48)

How do I mail a large yellow envelope?

Are stamp prices going up in 2021?

What is the cost of a new Forever stamp? The new prices include a 3-cent increase in the price of an FCM Forever stamp, from 55 cents to 58 cents.

How many stamps do I need for an 8 oz large envelope?

USPS classifies a 9″ x 12″ envelope as a “flat.” At this writing, the postage rate for flats is $1.00 for the first ounce, and $0.21 for each additional ounce. So the postage required for an 8-ounce flat is $2.47.