How much does a gallon of milk weigh?


The weight of a substance, such as milk or water, for a given amount depends on the density of that substance. What if we want to find the weight of a gallon of milk?

Assuming we're using generic 2% milk at room temperature, we know two things:

  • Its volume = 1 gallon and its density = 1.03 kg/L.

  • Using the volume and the density, we can find the weight with following formula:

  • Weight = Density x Volume.

  • First, however, all of our known quantities need to be in the same units. Let's convert the milk's volume into liters:

  • 1 gallon is equal to 3.78 liters, so we have 3.78 liters of milk.

  • We can now proceed with our equation:

  • Weight of milk = 1.03 kg/L x 3.78 L, so 3.89 kg.

  • Now, let's convert our answer back into an imperial unit, the pound. Here's the equation:

  • 1 kilogram is equal to 2.20 pounds.
  • So the weight of milk = 3.89 x 2.20, or 8.56 pounds.
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