How Many Grams in a Cup of Sour Cream? 230 Grams, and Why Sources Disagree
Open a 16 ounce tub of sour cream. Scoop it into a measuring cup and you will fill the cup almost exactly twice, which is the first clue that this conversion is friendlier than most. How many grams in a cup of sour cream? About 230 grams for a US cup of full-fat sour cream. That is the number to use, and the rest of this article is about why you will also see 224, 240, and 227 printed in different places, and when the difference actually matters.
Sour cream sits in the dense middle of the ingredient world. Water weighs 237 grams per US cup. Sour cream, at about 18 to 20 percent fat and thick from culturing, lands just under that at 230 grams. Greek yogurt, denser still, is around 285 grams per cup, and that comparison is useful because it shows why "a cup weighs a cup" is nonsense. Same volume, wildly different weights, all because of density and air. Sour cream's density is close to water's, which is why its weight in ounces, about 8.1 ounces, nearly matches its volume of 8 fluid ounces. That coincidence does not hold for flour, sugar, or anything you can fluff up with a spoon.
The conversion table, from 230 grams per cup. 1 cup: 230 grams. 3/4 cup: 173 grams. 1/2 cup: 115 grams. 1/3 cup: 77 grams. 1/4 cup: 58 grams. 1 tablespoon: 15 grams. 1 teaspoon: 5 grams. A 16 ounce tub is 454 grams, which divides to 1.97 cups, so half a tub is your 1 cup in practice. An 8 ounce tub is 227 grams, which is one cup minus a teaspoon, close enough for a dip and not quite close enough for a pound cake, which is the distinction this whole article keeps coming back to.
How many grams in a cup of sour cream, and why the sources disagree
The disagreement is real and it is small. USDA FoodData Central brand listings give about 224 grams for one branded sour cream and 240 grams for several others, with a commonly cited USDA figure around 230 grams. Baking references variously print 227 grams, which is 8 ounces exactly, and 240 grams, which is the metric cup figure carried over to a US cup by mistake in some tables. None of these sources is lying. They are measuring different brands, different fat contents, and sometimes different cup sizes. A metric cup is 250 milliliters, a US cup is 237 milliliters, and a source that converts a metric cup weight to a US recipe without adjusting has already added 5 percent before you pick up a spoon.
So what do you actually do? For tacos, dips, toppings, and anything where sour cream is a condiment, use 230 grams and stop worrying. The 10 gram spread between brands is less than a tablespoon, and nobody's taco notices. For a sour cream pound cake, a coffee cake, or any recipe where sour cream provides most of the moisture and fat, weigh it. Put the bowl on the scale, tare it, and spoon in 230 grams. That takes 20 seconds and removes the only variable in the recipe you cannot control by reading the label, because the label gives you ounces by weight for the tub, not grams per cup, and you would be converting anyway.
Light sour cream deserves a warning of its own. It has roughly half the fat of full-fat sour cream, about 10 percent against 20 percent, and the missing fat is replaced by stabilizers, starches, and air. The cup weight stays close, but the baking result does not. A cake made with light sour cream comes out drier, and the usual fix, one tablespoon of melted butter per half cup of light sour cream, replaces some of the fat you were trying to avoid. If you are baking, buy full-fat. If you are topping tacos, use whatever is in the fridge and enjoy the 10 grams you saved thinking about it.
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Run the free cups to grams converterFrequently asked questions
How many grams in a cup of sour cream?
About 230 grams for a standard US cup of full-fat sour cream. USDA FoodData Central listings for branded sour creams range from about 224 to 240 grams per US cup, so 230 grams is the practical middle value.
How many cups in a 16 ounce container of sour cream?
About 1.97 cups. A 16 ounce container by weight is 454 grams, and 454 divided by 230 is 1.97. In practice, half a 16 ounce tub is close enough to 1 cup for most recipes.
How many grams in a tablespoon of sour cream?
About 15 grams. A US cup holds 16 tablespoons, and 230 divided by 16 is 14.4, rounded to 15 grams in most conversion tables.
Does light sour cream weigh the same as full-fat?
Close, but not identical. Light sour cream has about half the fat, around 10 percent versus 20 percent, and different stabilizers and aeration, so its cup weight can differ by a few grams. For baking, the bigger difference is the fat, not the weight: light sour cream gives a drier result.
Is a cup of sour cream the same as 8 fluid ounces?
Nearly. A US cup is 8 fluid ounces by volume, and sour cream is dense enough that its weight in ounces, about 8.1 ounces for 230 grams, almost matches its volume. That coincidence is why the tub math works out so neatly, and why it fails for lighter ingredients like flour.
Related: How Many Grams in a Cup of Greek Yogurt? · How Many Grams in a Cup of Butter? · How Many Grams in a Cup of Milk? · Is a US Cup the Same as a Metric Cup? · Why a Cup of Flour Weighs Different Every Time
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