One cup of active bubbly starter weighs 200 grams. Our New York-style sourdough bagel recipe calls for one cup of active starter. On the other hand, to make a loaf of our Everyday No-Knead Sourdough Bread, you only need ¼ cup if starter which is 50 grams. The amount of starter you need is dependent on the recipe you choose. If you choose to make a recipe requiring more starter, simply leave the discard in the jar rather than throw it away, and feed fresh flour and water as per usual.