You are assuming a stick of butter doesn't have a standard amount, which simply isn't true. Each stick is a half of a cup and is a quarter of a pound even if the dimensions of the stick are different. If you need less, there are marking to cut it, much like the markings for grams on the butter in Norway.
If I'm converting from sticks to grams, I use the above information as a guide or simply weigh it. The information to covert it is easily found online, I've done it many times - mostly, I've not lived in the US for many years yet I still want to make familiar foods.
If I'm converting from sticks to grams, I use the above information as a guide or simply weigh it. The information to covert it is easily found online, I've done it many times - mostly, I've not lived in the US for many years yet I still want to make familiar foods.