A cup of sliced apple weighs 109g, which is equal to just over one average-sized small apple. For example, an average-sized small apple weighs about 149g and the core (waste part of the apple) weighs around 30g which gives a net weight of 119g. If you're using chopped (or cubed) apple, a cup will weigh 125g, which is equal to just over one small apple (without the core).