That all depends on how much is in it. It goes by weight. See the U.S. domestic postage website at the link below.
Anyway, it's not about "how many stamps" but "how much postage." Stamps come in denominations from 1 cent on up.
2
It is a combination of size and weight. The size will require an additional fee as it is classified as over-sized and doesn't get handled by machines. You will have to weight you envelope, which you can do at the post office.
At that size and weight, it would cost $2.20 (as of 2016).
At the current rate of 45c per stamp and the rate of small priority mail features at $5.15 you would need 12 stamps. Welcome to third grade math. Enjoy!
If you mean 7/12 then another 5/12 are needed because they both add up to 1
12 ft X 12 ft = 144 sq ft
The answer will depend on what country you are in, where (in the world) the letter is going and the value of each stamp!
The number of stamps needed for an envelope depends on the weight and destination. The weight limit for a standard USPS First-Class Mail envelope is 3.5 ounces. For an envelope weighing 12 lbs, you would need to use a different shipping method, such as USPS Priority Mail or USPS Priority Mail Express. The specific number of stamps required can be calculated using the USPS postage rate calculator or by visiting your local post office.
It is a combination of size and weight. The size will require an additional fee as it is classified as over-sized and doesn't get handled by machines. You will have to weight you envelope, which you can do at the post office.
At that size and weight, it would cost $2.20 (as of 2016).
It depends mainly on the weight. Take it to the post office and they will happily calculate this for you. (I can't actually guarantee they'll be happy about it, though they certainly should be happy that someone is still using the US mail.)
It depends on the weight as it would be processed as "Flat Mail". Visit the Related Link for a chart of the price by oz. from the USPS.
Priority Mail flat rate envelopes cost US$5.75 in postage. With standard 49 cent stamps, it would take 12 stamps to cover the postage.
There are a Dozen, meaning 12 stamps. A dozen of anything is 12.
12 stamps
12 stamps (a dozen means 12)
Its a trick question there are always 12 items in a dozen, it does not matter what they are. so a dozen stamps is 12 no matter what.
I just weighed my letter size envelope with 12 standard pieces of paper folded inside and it was 2 ounces. According to USPS.com, the cost is $.64. I am using 2 forever stamps to get the letter on its way. If you can't fold the paper like a normal letter, go to USPS.com where they provide a convenient postage price calculater.