How much does water weigh?

In this short article, we will answer the question “How much does water weigh?”, discuss if the temperature of the water affects its weight and will also discuss the percentage of water weight in our total weight.

How much does water weigh?

1 litre of water weighs 1000 grams of water, that is, 1 kg.

Let’s understand better why:

Density = Mass/Volume:

The water mass is the weight, in this case:

Volume = 1 L of water, or 1000 mL

Density = 1 (g/ml) If at room temperature


1 g/mL = Mass of water / 1000 ml;

Mass of water = 1000 ml x 1 g/ml

Mass of water = 1000 g


Mass of water = 1 kg (because 1000g = 1 kg)

What makes one litre of hot or cold water weigh more or less?

Although it might sound strange to ask, the weight of a litre of water varies depending on its temperature. 

Due to the fact that water density varies with temperature, measuring a litre of hot water will require less liquid than doing it with cold water (hence the ambient temperature is estimated in the above formula).

Keep in mind that the litre measures volume, not weight. As a result, a litre of water will weigh 999.97 grammes when measured at 4°C but only 995.94 grammes at 30°C. 

It might seem insignificant, but it contributes to the overall weight, especially if you have to transport a 1-litre bottle back and forth.

What portion of our overall weight is made up of water?

A person’s average weight is made up of between 50% and 2/3 water. Women often have more fat than men do, which causes the percentage of water in women to be lower (52% to 55%) compared to a man’s average body weight of 60%.

Adipose tissue contains a lower amount of water than lean tissue. Elderly and obese individuals have lower body water percentages. At birth and in the early years of childhood, a higher proportion of body weight (70%) corresponds to water.

A 70-kilogramme man has 42 litres of water in his body, which is made up of 3.5 litres, or about 8% of the total, in the blood, 10.5 litres in the area around the cells, and 28 litres in the cells themselves.


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