how many grams in a cup of milk?

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things people ask

• How many grams in a cup of milk?
  About 226 g for whole or 2% cow's milk. The number sits a hair under water (which would be 240 g per cup) because milk's fat lowers density slightly. Skim runs marginally heavier than whole — closer to 240 g — but for batter, béchamel, or bread dough, 226 g per cup is the figure to plan around.
• Can I swap buttermilk for whole milk cup-for-cup in baking?
  By volume, yes — but the chemistry shifts. Buttermilk is acidic, so a recipe with baking powder will get an extra rise if you swap it in, and one with baking soda needs the acid to activate. For pancakes and biscuits the swap usually improves tenderness. For custards and béchamel, stick with whole milk; buttermilk curdles when heated.
• Why does my bread dough hydration feel off when I measure milk by cup?
  Bread bakers calculate hydration from the water content of the liquid, and milk is roughly 87% water. One cup (226 g) contributes about 197 g of water plus fat, sugars, and protein that change crumb structure. If you're following a hydration percentage strictly, weigh the milk and adjust — eyeballing two or three cups compounds the error.

related conversions

• Milk: tablespoons to grams
• Milk: teaspoons to grams
• Milk guide