How many stamps do you put on an envelope going to canada?

Question

i've never sent a letter internationally before and i don't know how many stamps it will need. i'm in the U.S.

Answer 1

http://ircalc.usps.gov/default.asp?Mode=...

Answer 2

Canada is $.63 for the first ounce.

That is the same price as 2 oz in the US. One $.39 and one $.24 stamp.