Here's what I do. As soon as I know what runway is in use, or is likely to be in use, I set that on a cockpit dial somewhere. Most aircraft I fly have at least an ADF and one VOR display, some have an RMI or something else. One of those gets adjusted so that the runway in use is on top.
As soon as I get a wind vector somehow, I can then just superimpose that mentally over the instrument, and I know immediately what sort of wind I'm dealing with.
As others have said, the exact value is not important. It fluctuates anyway. What is important is the direction it's coming from, and the approximate strength, plus any gust factor.
Don't try to overcomplicate things. Especially not when your brain and eyes should be engaged elsewhere.