how many grams in a cup of buttermilk?

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things people ask

• Why does a cup of buttermilk weigh 227 g instead of a round 240?
  King Arthur and most US ingredient charts list cultured buttermilk at roughly 227 g per cup. The lactic-acid fermentation thickens the milk and changes how it settles in a measuring cup — air pockets and clinging to the sides mean a level pour comes in lighter than fresh whole milk. Shake the carton before measuring; settled curds throw the weight off either direction.
• Can I substitute a homemade milk-and-vinegar mix cup-for-cup?
  Volumetrically, yes — one cup of milk plus a tablespoon of white vinegar or lemon juice activates baking soda similarly. The flavor is thinner and the texture less viscous, so biscuits and pancakes turn out a touch less tender. For recipes where buttermilk is the headline flavor — ranch dressing, marinades, Irish soda bread — track down real cultured buttermilk; the swap shows up in the finish.
• Does low-fat buttermilk weigh the same per cup as full-fat?
  Within a few grams, yes. Most commercial buttermilk in the US is 1% or 2% fat, and the 227 g figure covers that range. True full-fat cultured buttermilk (less common) sits a hair lower because fat is less dense than water. For baking, the swap is invisible at the cup scale; acidity and protein content matter more than fat for leavening reactions.

related conversions

• Buttermilk: tablespoons to grams
• Buttermilk: teaspoons to grams
• Buttermilk guide