Why is buttermilk slightly denser than whole milk?

Commercial lowfat buttermilk (1.036 g/ml) is denser than whole milk (1.031 g/ml) because it has less fat — and fat, at ~0.9 g/ml, is less dense than water. With less fat in the mixture, the remaining water-soluble milk solids push the overall density slightly higher. The difference is only about 1 g per cup — negligible for cooking.

Can I substitute regular milk for buttermilk by weight in baking?

By weight, the densities are close enough (1.036 vs 1.031 g/ml, <1% difference) that volume and gram substitutions are structurally equivalent. However, buttermilk's acidity is what triggers leavening when paired with baking soda. A functional substitute is 1 cup milk + 1 tablespoon lemon juice or vinegar, left to curdle — this replicates the acidity but not the protein composition.

How many grams is a cup of buttermilk?

At 1.036 g/ml, one cup (236.6 ml) of lowfat cultured buttermilk weighs approximately 245 g — the same as skim milk and about 1 g more than whole milk.

Latte, latticello, fluido, coltivato, magro: da mL a grammi (conversione)

Q: How many grams is a cup of buttermilk?

At 1.036 g/ml, one cup (236.6 ml) of lowfat cultured buttermilk weighs approximately 245 g — the same as skim milk and about 1 g more than whole milk.

Di Fidamen-Chefsolver Team | Revisionato da Chefsolver Staff

Cultured lowfat buttermilk — the commercial version widely sold in cartons — is produced by fermenting lowfat milk (typically 1–2% fat) with lactic acid bacteria. Despite the name, it contains no butter and is thinner than sour cream or plain yogurt. At 1.036 g/ml, it is marginally denser than whole milk (1.031 g/ml) because the lower fat content leaves more dissolved water-soluble solids per unit volume. A cup weighs approximately 245 g; a tablespoon weighs about 15.3 g. Pourable like regular milk, with a tangy flavor. Its most important culinary role is its acidity: it reacts with baking soda to leaven biscuits, pancakes, cakes, and fried chicken coatings.

Convertitore rapido

Ingrediente

Cup statunitense = 236,588 mL
1 cucchiaio = 14,787 mL
1 cucchiaino = 4,929 mL

Tabella di riferimento

Latte, latticello, fluido, coltivato, magro — da millilitri a grammi
mL	g
10	10
25	26
50	52
75	78
100	104

Come funziona questa conversione

I millilitri misurano il volume, i grammi il peso. Poiché Latte, latticello, fluido, coltivato, magro ha una densità di 1.036 g/mL, 10 mL pesano 10 g — non 10 g come per l'acqua. Questo convertitore usa la densità reale di Latte, latticello, fluido, coltivato, magro per un risultato preciso.

Note sulla misurazione

I valori sono arrotondati al grammo più vicino. Il peso effettivo può variare leggermente per compattazione, temperatura e marca. Per la pasticceria di precisione, una bilancia da cucina è sempre più affidabile delle misure a volume.

Domande frequenti

Why is buttermilk slightly denser than whole milk?: Commercial lowfat buttermilk (1.036 g/ml) is denser than whole milk (1.031 g/ml) because it has less fat — and fat, at ~0.9 g/ml, is less dense than water. With less fat in the mixture, the remaining water-soluble milk solids push the overall density slightly higher. The difference is only about 1 g per cup — negligible for cooking.
Can I substitute regular milk for buttermilk by weight in baking?: By weight, the densities are close enough (1.036 vs 1.031 g/ml, <1% difference) that volume and gram substitutions are structurally equivalent. However, buttermilk's acidity is what triggers leavening when paired with baking soda. A functional substitute is 1 cup milk + 1 tablespoon lemon juice or vinegar, left to curdle — this replicates the acidity but not the protein composition.
How many grams is a cup of buttermilk?: At 1.036 g/ml, one cup (236.6 ml) of lowfat cultured buttermilk weighs approximately 245 g — the same as skim milk and about 1 g more than whole milk.