It depends what you have in the cup: A cup is a measure of volume,
but a gram is a measure of mass.

Depending on the density of the material you are going to have in
the cup, the weight in grams of the material will vary. For
example, if you fill the cup with lead, the cup will weigh much
more than if you fill with feathers.

This question would be similar to asking how much a 6-foot person
weighs. It depends on the person, of course. A cup of water will
weigh more than a cup of flour.

For cooking, you can find tables that convert cups to grams and
vice versa for a variety of food. Below is a link with a table for
standard cooking ingredients. Make sure you look carefully and
scroll down to find the correct conversion table specific
ingredient you are using! The conversion is different for each
ingredient!

Here are a few common foods and their conversion from cups
to grams (notice how much the weight varies!):

Granulated sugar: 1 cup = 200 grams
Brown sugar: 1 cup, packed = 220 grams
Sifted white flour: 1 cup = 125 grams
White rice, uncooked: 1 cup = 185 grams
White rice, cooked: 1 cup = 175 grams
Butter: 1 cup = 227 grams
Almonds, slivered: 1 cup = 108 grams
Oil: 1 cup = 224 grams
Maple syrup: 1 cup = 322 grams
Milk, non-fat: 1 cup = 245 grams
Milk, sweetened condensed: 306 grams
Broccoli, flowerets: 1 cup = 71 grams
Raisins: 1 cup, packed = 165 grams
Milk, dry: 1 cup = 68 grams
Yogurt: 1 cup = 245 grams
Water: 1 cup = 236 grams
Confectioners sugar: 1 C = 110 g
Cocoa: 1 C = 125 g

To do the conversions, see the Related Link. Just enter the food
and the amount, and it will convert any units you want!

There is also an IPhone App called Kitchen Calculator PRO which
does weight to volume conversions and other useful stuff. Great
cooking aid.

Additional information:

In that we're in a discussion of volume - cups and fluid ounces,
you've asked a difficult question: If you're measuring water, then
1 ounce is equal to 29.57353 ml, so 40 oz would be 1.183 liters.
Since water weighs 1 gram per ml (or 1 kg per liter), then you'll
have 1.183 kg, or 1,183 grams.

If, on the other hand, you are measuring anything else - oil, milk,
flour, etc. - then you need to have one more piece of information
before you can switch from volume to weight. You must know the
specific gravity of the substance. An ounce of oil, for example,
weighs less than an ounce of water (that's why oil floats on
water).

Okay, one cup equals 236 cubic centimeters. However, a cup of milk
will weigh a different number of grams than a cup of cod liver oil.
But to cut to the quick, asking how many grams in a cup is like
asking how many pounds in a gallon. You are using two entirely
different types of measurement, one of weight, the other of volume,
to ask the question. A given volume of space filled with two
different types of materials will have two different weights. Also,
remember that in the more logical English system of measurement, a
fluid ounce and a dry ounce mean two different things.

1 cup = 240 ml = 8 fl oz = 1/2 pint (liq) = 16 tbsp = 48 tsp, all
measurements regarding kitchen and cooking are standard and do not
vary depending on the material.

It's true that it depends on the density of the ingredient you are
measuring. Luckily, the nutrition label for many foods has a
serving size listed in both volume and weight, which you can use
for conversion.

For example, I have a recipe that calls for 250 grams of almond
meal. The label on the almond meal says 1 serving = 1/4 cup (28
grams). So now I know that 1 cup = 112 grams (or 28 x 4). 250/112 =
2.23 cups, so that's how much almond meal I will use in my recipe.

A cup is a measure of liquid volume, equivalent to approximately
250 cubic centimeters. (cc's) One cubic centimeter of water weighs
one gram at one degree Celsius. One cubic centimeter of gasoline
weighs somewhat less, and one cubic centimeter of lead weights
considerably more. So a cup of water would weigh about 250 grams,
but a cup of gasoline would weigh less, and a cup of lead would
weigh more.

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Charlie N.

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I have spent many years renovating buildings and leading a commercial handyman crew.

Around 200g are in a cup of brown sugar, but this amount varies quite a lot with the moisture level and the amount that the sugar is packed into the cup.

That depends on what you are measuring and it's density. Grams is a measure of weight, when as a cup measures volume, so they aren't comparable unless you know what material y…ou're measuring. You could either convert the grams to lbs, or then use an approximation. One cup of butter is 226 grams, so you can probably use that and you wouldn't be off by much.