All you really need to know are the common draw odds. After a while theres not much need to calculate.

Just know:

4 outs (inside straight)
6 outs (AK with a missed flop)
8 outs (open or double inside straight)
9 outs (flush)

and if you have overcards to the board you can sometimes count those as outs too.

I don't typically bother calculating if I have at least 13 outs, at least in NL, because the implied odds typically make it a good call.

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