I certainly don't bother calculating it, most of the time a combination of looking at the windsock and once you are actually on final, your crab angle. I transition to wing down but always start with a crab as that gives you a good idea.
Its not exactly a precision science anyway, the measured wind will not be the same as the wind you actually experience on your way down final, its measured in a different place and a short time before you will be landing.