Weight for meat .. should it be before cooking or after

Typically it is weighed raw unless otherwise specified. If you weigh it cooked just be sure to select the appropriate cooked entry. If you weigh it cooked and select a raw entry, you're eating more than you think.

I prefer to weigh most foods raw rather than cooked, because the cooked entries assume someone cooked it to a specific degree of water loss (or, depending on the food, eg oatmeal, water absorbtion). I can cook two 180g (raw weight) chicken thighs and they are not going to weigh the same when they are done, but the calorie count will likely be pretty consistent lol.

The important thing though is to make sure you use a database entry that matches whether you weighed your food raw or cooked. If you weighed it raw, use an entry that says "raw." If you weighed it cooked, use an entry that says "cooked." If the entry doesn't say, assume raw. (If you are eating packaged food as opposed to whole unprocessed food, read the package label for guidance).

Raw if I make a single serving or put it in a recipe, cooked otherwise. What matters is using the correct entry.