How much will I get if I walk into a bar in Canada and ask for a pint?

Well, I don't drink beer really but even I know that you can order a pint in many pubs. Although we do share a lot with the US, small gles are not one of them. Most moderate sized cities will have several bars/pubs at which at least some would know what it is. Cities like Victoria, BC probably have a higher than average knowledge as the city, at least in places, prides itself on being quite "British". The size does vary depending, like said earlier, on the amount of head on your beer. You are probably looking at 500ml or more in most though.