I'm not sure, sorry I couldn't help. :(
Depends on where it is going to!
Since the envelope is 5.25 X 5.25 inches square, the postage is .70 cents for first class. This rate is for an envelope that weighs .5 ounces. The postage may be higher depending on the weight of the envelope.
The postage is standard first class 1 ounce (a "Forever" stamp).
In the US, $1.56.
It depends on where it is being posted from, where to and, quite possibly, its weight.
thirty-two cents
Go to the site below and click on the "Calculate Postage" tab.
two stamps at regular price.
$0.44
For the first ounce it will be 88 cents. There is an additional charge for the larger size. Each additional ounce is 17 cents.
twelvepoint fifty
Postage is by weight - not size where letters are concerned.