How to tell how much sugar is in these wines?

[Innkeeper]

No, because you would have to check how much sugar was in it to begin with. This is possible by checking the brix that the wine was picked at, and comparing it to the alcohol level in the finished product. All this is not necessary in most cases. As repeated here time after time, most wine is dry; meaning that there is no residual or added back sugar in it.

Many of the wines that are off dry will have the amount or percentage of residual sugar printed on the front or back label. An exception to this is white zin. You just have to experiment to find a dry one or one with the sweetness you desire.