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Okay, so I'm not too good with envelopes and postage and such, and I'm so sorry if this has already been explained.

How many stamps should I put on a letter from the US to Australia?

Assuming it's just a letter in a small envelope with nothing else, $0.98 will cover it. It could cost more if it's bigger and/or has photos inside.

So should three stamps cover it?

Thanks!