Basic unit for mass A paperclip weighs about 1 gram.Hold one small paperclip in your hand. Does that weigh a lot? No! A gram is very light. That is why you often see things measured in hundreds of grams.Grams are often written as g (for short), so “300 g” means “300 grams”.A loaf of bread weighs about 700 g (for a nice sized loaf)