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My letter is 30 grams and I have a 1 ounce USA stamp (global stamp) will I get away with it? because 1 ounce is 28 grams?

I have found that it's really hard to tell, I have sent two letters that weighed the exact same thing with the exact same postage and one came back because not enough postage was on it. I usually will put an extra stamp or at least an extra few cent stamp on there if I have any questions at all. But there is still a chance it might make it through as some of mine have.