'How many bytes/KB per tweet?

I have been reading a lot of SO posts and external blogs. Something that is confusing me is without going in too deep into breakup of UTF8 : Does each character mean 2 bytes or 4 bytes? I have seen BOTH being mentioned. Given the CURRENT twitter limit of 280 characters, is this the right calculation ?

For A-z0-9 We use 1 byte
    280 * 1 = 280 bytes
stringmemory


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