https://www.celebheights.com/s/Ryan-Gosling-589.htmlHonestly, looks 5'10.5" to 5'11" in most everything he's been in.
You can Google plenty of pics of him standing next to 5'6" Emma Stone… Gosling consistently looks 3-3.5" taller.
Then add in the 1.5" advantage of her high heels vs Gosling's dress shoes, and Bob's your uncle.