Not all paper has the same thickness or size, but if you are using the most usual type of paper, you can mail four sheets with one regular stamp.
Postage is determined by weight and by size. An envelope with three pieces of normal paper can normally be sent with one first class postage stamp. Additional stamps may be required based on additional ounces and on the size of the envelope.
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One ounce. That's four sheets of typing paper plus the envelope.Read more: What_is_the_most_a_letter_can_weigh_for_a_42_cent_stamp
Not all paper has the same thickness or size, but if you are using the most usual type of paper, you can mail four sheets with one regular stamp.
You can send up to five sheets of paper in a regular or business size envelope for one 42¢ stamp, to any state.
According to the USPS website you can have 3 pieces of paper and one envelope equalling about one ounce. However for 2 ounces they charge .58 cents. One ounce with an envelope is roughly 8 sheets of "cheap copy paper" or standard notebook paper.
Sheets of paper in one envelope are called a ream.
One ounce. That's four sheets of typing paper plus the envelope.
If you're mailing a letter that can be at most 50 grams, you should be able to include about 10 sheets of paper plus the envelope. Source: http://ansuz.sooke.bc.ca/professional/reference/paperweight.php
It only takes one for the first ounce. For additional weight, you will have to add additional stamps. Usually four sheets of paper in an envelope will need an extra stamp.
See page #12 of: http://www.southernct.edu/finadm/uploads/textWidget/wysiwyg/documents/USPS_New_Rates.pdf Not only does it let you know how many pages of mail you can mail for one stamp, it breaks it down by the type of envelope you use. As of 03/2009 it is 1-5 sheets of 20 pound copy paper in a #10 envelope or 1 ounce 1-4 sheets of 20 pound copy paper in a 6x9 envelope or 1 ounce Total envelope must be less than 1/4 inch thick. If you don't want to buy exact postage you can us 2 stamps for up to 3 ounces with the envelope less than 1/4 inch thick. In a #10 envelope that is 17 sheets of 20 pound copy paper In a 6x9 envelope that is 16 sheets of 20 pound copy paper Keep in mind the number of sheets is approximate and paper weight will make a difference!
As of 2016, a 2.5 ounce envelope it would cost 93 cents (one Forever stamp plus two extra ounces).
If you envelope weighs less than one ounce, it will take one forever stamp or one current first class stamp. If the letter and envelope weigh more than one ounce, the number of stamps will depend on the weight and the denomination of the stamps.
One 49-cent stamp should be all that is needed.
A stamp because it sits in the corner of the envelope and then it gets posted somewhere on the other side of the world!