One will do.
On a standard letter just one.
It depends on the weight of the letter, not where it's going.. The rule I use it, Less than 5 pages one stamp. If the letter is 5 pages or more be safe and use 2 stamps.
One, as long as it is 45 cents and the letter is 1 ounce or lower.
This is going to depend on where you are originally mailing the letter from. The amount of postage for a letter is determined by the weight, size and destination of your item. If you are sending a one ounce letter from the United States, it should cost you a little over $1.00.
Should just be one
It depends on where you are mailing the letter from. If from the USA, it would take two stamps. If you are not from the USA, then I would suggest going to your post office or place where you send the letters and the workers there will weigh the letter and tell you how many stamps or how much money is needed to mail your letter.
The answer will depend on what country you are in, where (in the world) the letter is going and the value of each stamp!
You only need one first class stamp to mail a letter anywhere in the USA.
going into battle
u need to use usa stamps as English ones are not valied on a letter from America to England ============================================== Postage from the USA to England is 90 cents for a regular letter.
what stamp amount is needed if the letter is 15 oz.?
A standard letter up to 100grams within the UK will cost 63p. The same letter going to France will cost £1.52