How many grams in a cup of Milk? (1 Scientific Aspect)

In this brief guide, we will answer the question, how many grams in a cup of Milk?’. We will consider the factors which impact the deviation in grams in a cup of milk. We further discuss the conversions and calculations necessary when measuring milk in the kitchen.

How many grams in a cup of Milk?

A cup of milk holds either 240 grams or 250 grams. The legal US cup holds 240 grams or milliliters of a beverage or liquid such as milk, while the Metric Cup holds 250 grams or milliliters. 

There are 240 grams in a cup of whole milk, while 115 grams in a cup of powdered milk. In fluid ounces, there will be 8.6 oz in a cup of whole milk and 4.1 oz of powdered milk. Condensed Milk in a cup is equal to 310 grams.

What are the different sizes of cup?

The volume of a cup can deviate from 236 g or ml to 250 g or ml, depending on location, preference and the preferred system.

The four common cup sizes are the legal U.S. cup, customary U.S. cup, 1 imperial cup and the metric cup.

For some people who are associated with culinary science or arts, need precise measurements to make a certain food or beverage.

 Each of the cups have the following grams of a standard liquid:

1 legal U.S. cup = 240 grams

1 customary U.S. cup = 236.59 grams

1 imperial cup = 284.13 grams

1 metric cup = 250 grams

What is the difference between grams and milliliters?

Grams is a unit of weight, while milliliters are the volume. Volume corresponds with the amount of a substance which takes up a space such as in a cup. Grams is the weight which is related to the substance, rather than the cup which holds it. 

For water the volume and weight are same. The density of water is 1 gram per milliliter, which means for every gram you get the same number of milliliters. 300 milliliters of water will give you 300 grams of water. 

Every substance has a unique density, such as milk. The density of milk is slightly greater than 1. Milk is not just water, it has fats and protein compounds, which makes it slightly heavier than water. The density of milk varies from 1.03 to 1.04 ml/g, which is slightly higher than the density of water. 

However, for convenience, we take the density of milk to be 1 ml/g. Nonetheless, the density of water also is not exactly 1 milliliter per gram either. It is a little less; at 0.999 ml/g. Where we round off water to 1, there is no rationale we could not do it for measurement of milk in the kitchen. For scientific accuracy, you could stick to rounded-off values but bear in mind that the calculation could be a little hard to follow. 

For whole milk, homogenized milk, skimmed milk, and fortified milk; the density of all the kinds of milk lies between 1. 03 and 1.04 ml/g. However, the density or consistency of powdered milk and condensed milk varies greatly from the aforementioned milk types. Therefore, in such instances you cannot translate the volume to weight as easy; rather look for precise values. 

Other FAQs about Milk which you may be interested in.

How long can fresh milk be left out?

How long can I keep formula milk in the fridge?

How to know if milk is spoiled

Let us delve into some more common sizes of cups:

A cup is a subjective term; especially as we move across the world. Therefore, the cup is not a term that is internationally recognized. A cup can denote around 5 different measurements; Legal US cup, Customary US cup, Imperial cup, and Metric cup.

According to the metric system, the volume held in a cup of milk is 250 milliliters which are about 8.45 fluid ounces. The standard American system, however, rounds 8. 25 ounces to 8 ounces as the legal cup, which in milliliters is 237 ml. The imperial system holds 240 milliliters or 8.12 ounces.

What is the significance of milk?

Besides being whole food, it is a game-changer in recipes. Milk is a wholesome drink that provides calcium, potassium, proteins, riboflavin, zinc, and magnesium. Regular milk consumption is associated with a reduced risk of developing osteoporosis, cancer, and heart diseases.

Milk is a crucial ingredient in a lot of savory and sweet foods. Its versatilities such as its properties and aesthetics make it a staple in every kitchen. Unlike spices and seasonings, a precise calculation of the milk content is a vital step. It may be a necessary ingredient in puddings, ice creams, and cakes but a wrong quantity of milk could sabotage the dish.

In this brief guide, we answered the question, how many grams in a cup of Milk?’. We considered the factors which impact the deviation in grams in a cup of milk. We further discussed the conversions and calculations necessary when measuring milk in the kitchen.


Hi, I am Charlotte, I love cooking and in my previous life, I was a chef. I bring some of my experience to the recipes on this hub and answer your food questions.