Milk Weight Calculator – How Much Does Milk Weigh?

Curious how much milk weighs? Enter the volume below to find out!


Learn how we calculated this below

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How Much Does a Gallon of Milk Weigh?

One gallon of milk weighs 8.6 pounds or 3.9 kilograms. That’s based on the density of milk being 1.026 g/cm³ – 1.034 g/cm³.[1]

One gallon of water, on the other hand, weighs 8.345 pounds. So, one gallon of milk actually weighs more than one gallon of water.

Milk weighs more than water because of its higher fat content. Although milk contains 87.7% water, the remainder is fat, protein, carbohydrate, and minerals, which weigh more than water.

As you might imagine, a half-gallon of milk weighs 4.3 pounds or 1.95 kilograms. That’s half the volume and thus half the weight of a full gallon.

Steps to Calculate the Weight of a Gallon of Milk

You can calculate the weight of a gallon of milk in a few easy steps.

First, convert the volume of one gallon to cubic centimeters. Since one gallon is equal to 3,785.41 cubic centimeters, you can use the following formula to convert it.

cubic cm = gallons × 3785.41

Then, multiply the volume in cubic centimeters by the density of milk. We mentioned above that milk has a density of 1.026 g/cm³ – 1.034 g/cm³, so using a density of 1.03, which is in the middle of that range and the following formula will yield the weight in grams.

weight (grams) = cubic cm × 1.03

So, one gallon of milk weighs 3898.9723 grams. Since one pound is equal to 453.59237 grams, the following formula will convert the weight to pounds.

weight (pounds) = weight (grams) ÷ 453.59237

If you solve all of the formulas, you should find that one gallon of milk weighs 8.629 pounds.

Milk Weight Chart

To find the weight of milk in other measurements, such as quarts or pints, refer to the chart below.

Weight of milk for various volumes
Volume Weight
One Cup 0.5375 lbs (0.2438 kg)
One Pint 1.075 lbs (0.4876 kg)
One Quart 2.15 lbs (0.9752 kg)
One Gallon 8.6 lbs (3.901 kg)
One Liter 2.272 lbs (1.031 kg)

Of course, you can also use our gallons to pounds converter to calculate the weight of various ingredients.


  1. Anton Paar Ltd, Density measurement of milk and dairy products, The Engineer,