how many stamps do i need to send a letter from california to denmark

how many stamps do i need to send a letter from california to denmark?
so my best friend who moved to denmark wants me to sent them a letter but since they live in denmark i dont know how many stamps it will take
Government - 2 Answers
Random Answers, Critics, Comments, Opinions :
1 :
Your most accurate answer here: http://ircalc.usps.gov/
2 :
© One for international

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