The only way you can avoid doing the math is if someone else has already done it for you and you have the results of their work available.
Towered airports, of course, will control the runway direction from the ground, and will handle any lighting systems. At non-towered but fairly busy airports there will be an accepted pattern in use, and when anyone notices the windsock is pointing the other way the pilots can coordinate to "turn the airport around" (I'm actually curious how that happens; for strips that always have a left-hand or right-hand pattern, the answer is simply to not turn to final and instead just circle to the other end, but for airstrips where, for instance, powered planes must always stay to one side of the airport to avoid a residential neighborhood, you can't circle that way, and must instead make a 180 away from the airport to reverse the pattern direction).
However, your question infers that no radio chatter or other traffic is available to follow, and you have to determine it for yourself. You can still get some help in these cases.
Non-towered airports can still be lit; end lights and the LDI tetrahedron can be controlled from a simple automated weather station, and activated on request (to save energy) by pilots tuning to a station and clicking the mike.
If the pattern is truly empty, you can maneuver around the strip, look for the windsock, and approach in the direction closest to its tail.
Use a compass card; any will do, you have several in your cockpit, or you could even have a literal "compass card", a rose drawn on an index card on your clipboard or the inside cover of your notebook (whatever you're using for quick reference or shorthand notes on your flight). You know wind is from 225* and your options for runways are 13(0) or 31(0). A quick look at the dial will show you which runway choice is closer to the wind.
- Just remember not to get confused by the numbers on the rose; to land on runway 31, you have to go around to the southeast end, even though 310* is marked on the northwest quadrant of the compass rose; runways are labelled according to the heading you'll be on while using them.