How many grams in a cup of buttermilk?

1 cup of buttermilk weighs 245 g by USDA's figure. King Arthur Baking lists 227 g.

Sources: USDA FoodData Central, King Arthur Baking ingredient weight chart · Checked October 10, 2026

Amount

Unit

245 g 8.6 oz

Sources range from 227 g to 245 g for 1 cup.

Converting a whole recipe?

Sous Chef converts every ingredient in a recipe to grams and millilitres in one tap, rounded to amounts you would actually weigh.

Buttermilk cups to grams table

Using 245 g per US cup. A US cup is 236.6 mL; 1 cup is 16 tablespoons.

Buttermilk cups to grams
US cups	Grams	Ounces	Tablespoons
⅛ cup	31 g	1.1 oz	2
¼ cup	61 g	2.2 oz	4
⅓ cup	82 g	2.9 oz	5.3
½ cup	123 g	4.3 oz	8
⅔ cup	163 g	5.8 oz	10.7
¾ cup	184 g	6.5 oz	12
1 cup	245 g	8.6 oz	16
1½ cups	368 g	13 oz	24
2 cups	490 g	17.3 oz	32
3 cups	735 g	25.9 oz	48
4 cups	980 g	34.6 oz	64

Why sources disagree

King Arthur lists most liquids at 227 g per cup, which is 8 ounces by weight. A US cup holds 236.6 mL, and buttermilk is a little denser than water, so USDA's 245 g is the figure we use.

Source	Listed as	Grams per cup
USDA FoodData Central Milk, buttermilk, fluid, cultured, lowfat	1 cup = 245 g	245 g
King Arthur Baking ingredient weight chart Buttermilk	1 cup = 227 g	227 g

Bold row is the figure the calculator uses. Figures listed for a smaller measure are multiplied up to one cup.

How to measure buttermilk accurately

Shake or stir buttermilk first, because it can separate in the carton.
Weigh on a digital scale when you can, since it skips the mess of measuring cups.
Use a clear liquid measuring cup on a flat counter and read it at eye level.

Convert the whole recipe, not one line

Converting a recipe one ingredient at a time is where mistakes slip in. Sous Chef imports a recipe from a link or pasted text, then converts every ingredient at once: dry ingredients and butter to grams, liquids to millilitres. Tap again to go back to cups.

US recipe

2¼ cups all-purpose flour
1 cup butter, softened
¾ cup brown sugar, packed
1½ cups milk

In Sous Chef, after "Convert to metric"

275 g all-purpose flour
225 g butter, softened
170 g brown sugar, packed
350 ml milk

Example output. Sous Chef rounds to amounts you would actually weigh, so its numbers can differ by a few grams from the table above.

Common questions

How many grams is half a cup of buttermilk?

Half a cup of buttermilk is about 123 g, using 245 g per cup.

How many grams is 1 tablespoon of buttermilk?

1 tablespoon of buttermilk is about 15 g, since 1 cup is 16 tablespoons and 245 g per cup divided by 16 is 15 g.

More conversions

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