Sometimes its easy enough to work out, assuming a British teaspoon is the same size as an American one, but i get confused at "half a stick of butter" and "cup of flour".
How big a cup are you talking? Does American butter come in sticks?
Thanks to a quick trip to Pinterest, I've found some great infographs that i want to share to help ease the confusion.
If you have a Gas oven though then this infograph is probably better for you, plus it has an ounce to gram conversion which is handy depending on which your scales unit your scales use.