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Just multiply the three numbers. The result will be a volume, in cubic inches.
area of envelope = l Xb =8.5 X11 =93.5 inch^2
The cost will depend upon the size and also the weight of the envelope. Also if it is first class or second class mail, and the country you live in. If you are in UK you can go to Royal Mail website and get the exact price of the cost but you need the weight of the envelope.
One
An envelope with a height exceeding 6 and one-eighths inches, and any square envelope, is non-machinable. Therefore, the rate for first class US domestic postage is $.64.
Depends om where you are sending from, where to, how much the envelop weighs, whether or not it is first class/express, whether it needs to be be insured or signed for, etc.
The cost to mail a manila envelope will depend on the size of the envelope and the weight of the envelope. The average cost to mail a manila envelope that is 8"X11" is about $2 if the contents weigh less than one pound.
One Forever stamp, or 47 cents.
From where to where .
That depends entirely on which country you are in and where you are mailing it to
5.25 X 5.25 envelope
2.05