There is an excellent conversion on stockhouse. You look up the company and then there is a drop down menu for the currency you want.
There is also one on Yahoo but I like the stockhouse better.
It's hard to explain and I think I have you a little confused. The shares are the same. There are no US shares. You are buying Canadian shares. The listing on pinks is really just a way for US investors to trade online. Because there are relatively few trades under the pink symbol, the quotes and the trades do not reflect current reality. The HLSRF last trade might be a few days old even. I don't think you can even get a level 2 on alpha trade for hlsrf. Maybe you can do it. Do you get Canadian quotes?
Again, the key is to get the HLB.to quote and then convert to US dollars.
Not to get too far off base, but there are stocks that trade simultaneously on a Canadian exchange and e.g., AMEX or NASDAQ. The company actually applies for a dual listing. Then the price of the shares is arbitraged between the 2 by big players and MM's. This is not the case with pinkies. As I said, the pinkie "listing" is not a real listing of any kind, just a convenience.