12 days
The standard US letter rate is $.96 for 2008.
According to the US Post Office postage calculator (link attached to this answer) the current cost for the most basic postage, first class letter to from the US to the UK, is 94 cents. If you don't want to go to the post office to get the exact postage you need, three first class stamps would do it. You'd be overpaying, though. International Postal Union treaties used to require that postage have the cost printed on it to be honored for international mail. If this were still true, the "Forever" Stamp wouldn't be honored for international mail. However, the US Post Office stated in an online press release that the Forever Stamp is fine for international postage. You do, however, still need to add additional postage equal to the difference between the current US First Class letter rate and the higher International rate.
In 2008, postage from the USA to Germany, for up to 1oz letters/postcards, is 90 cents.
First class letter postage from the US to Canada is 0.85 cents in 2012.
For a first class letter of one ounce to another US destination, it takes 44 cents of postage.
The number of stamps which must be used to mail a letter from the US to Barbados varies based on the weight and size of the letter. An average letter will require 5 stamps to arrive at its destination based on 2013 postage rates.
postage rate to tanzania
Postage to Europe from the US is 98 cents for a one-ounce letter.
for a standard letter....98 cents
$2.66 for a first class letter from the US to Ireland.
A standard size, one ounce letter has a 45 cent postage rate.
34 cents
The postage rate was 44 cents.
To send a letter inside the US was .15.
As of early 2014, $1.15
As of early 2014, $1.15
The postage rate between US States and US Territories is 45 cents.