When meat is cooked, it loses moisture, usually to the tune of about 20 – 30% depending on how well it was cooked. Rare and medium-rare cuts of meat will be more toward the 20% end of the spectrum, while medium-well and well-done meat is more toward the 30% end of the spectrum.
When you buy raw meat at a store, the nutrition facts label lists the macros for that meat in its raw state (if the meat was packaged cooked, the macros will reflect that). Therefore, if you want to use the info on the package to track your meat, you’ll need to weigh it raw if you want your macros to be accurate.
But most of us can agree that weighing meat in its raw state is not only a hassle, but also isn’t very sanitary. If you’d rather weigh your meat cooked, fortunately you can find the macros for the cooked version of your meat in the Avatar tracking app (and on most other apps and websites). In the past, most of the information was for raw meat, so this was a much bigger issue back then.