What are ideal measurements for a run door opening? From the coop into the run?
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For you or for the chickens?
My pop door is 12" x 12". I've had a 6 month old midget white tom turkey use it. He was bigger than any chicken is likely to get. But depending on how your coop is framed, it might be easier to build a bigger one and tie it to the frame.
If it is for you, I suggest making it big enough so you can carry things through it and tall enough so you don't bump your head.
I don't believe in magic numbers for much to do with chickens. It's just whatever works for you.