A cubic foot of water weighs 62.48 pounds, or 28.258 kg, or 7.5 gallons at 20 degrees Celsius.
The table below shows the weight of water in different units.
| Cubic Foot of Water Weight | 62.48 pounds at room temperature. 7.5 gallons of water. |
| 1 liter of water | 1000 grams, 35.274 ounces, or 0.264 US gallons |
| 1 US gallon of water | 8.345 pounds or 3.785 kg at 17 °C |
| The specific gravity of water | The specific gravity of water is 1 at 4 degrees Celsius. Specific gravity is a ratio and has no units. |
| Unit weight of water (weight/volume) | 1 g/cm3 at 25 degrees Celsius |
Water is important to our existence, serving as a source of hydration, leisure, and so much more. Understanding how temperature, condition, and density impact the weight of the water can also aid us when cooking.
Table of Contents
What Is the Weight of Water?
A liter of water weighs approximately 1 kilogram (2.2 pounds), according to the United States Geological Survey (USGS). A gallon of water weighs roughly 3.79 kg, according to the USGS (8.35 pounds).
Water Density
Density is defined as the amount of material per unit volume. It is the mass-to-volume ratio of the substance. If we combine equal parts of wood and iron. We’ll find out that iron is heavier than wood. This is because iron contains more substance than wood.
Density ( ρ ) formula = material mass (m) volume (v)
At 4.0 °C (39.2 °F), the density of water in g/ml is 0.9998395. This is equivalent to one gram per milliliter (g/ml) or one gram per cubic centimeter (g/cm3).
Weight vs. Mass
The mass of a body is the quantity of stuff it contains, whereas its weight is equal to the force with which the earth draws it. In contrast to weight, mass is a scalar quantity whose value can never be zero. For details, check out the full article (Weight vs. Mass)
The Density of Water lbs/U.S gal
At 4 degrees Celsius, the density of water is 8.345 lbs/US gal. Therefore, the density of water in-lbs/U.S gal is equivalent to one gram per milliliter (g/ml) or one gram per cubic centimeter (g/cm3).
Units of Gallon
There are three different Units of Gallon:
| Weight of a Gallon of Water | Fluid ounces | Liters | lbs | Kg |
| 1 US gallon of water at 17 °C | 128 | 3.785 | 8.345 | 3.785 |
| 1 Imperial gallon of water at 17 °C | 153.72 | 4.545 | 10.02 | 4.545 |
| 1 US dry gallon of water at 17 °C | 128 | 4.405 | 9.711 | 4.405 |
How much does water weigh?
The weight of a gallon of water depends upon storing the temperature of the water, For the sake of the question, ‘How much does a gallon of water weigh?’, we are going to focus on the weight of fresh water at 62 °F (17 °C).
1 US gal of water = 8.345 pounds = 3.785 kg (at 17 °C).
1 Imperial gal of water = 10.02 pounds = 4.545 kg (at 17 °C).
Weight of 1 liter (l) of pure water (at 4 °C) = 1 kilogram (kg).
How Many Water Bottles in a Gallon?
A gallon (gal) is 231 cubic inches in the United States, which is equivalent to 3.785 liters or 7.58 bottles of water. One gallon is equal to 4.55 liters and 9.1 bottles in the Imperial system of the United Kingdom. Similarly, one gal contains 128 imperial fluid ounces, whereas a half-gallon equals 64 fluid ounces.
How to Calculate the Weight of Water in a glass?
The density of water in kg/m3 is 1,000 kg/m3, and in lb/ft3 it is 62.4 lb/ft3.
A glass of water is app 200 ml which is 0.0002 m3
mass = density x volume
mass = 1,000 kg/m3 x 0.0002 m3
mass = 0.2 kg
We can convert between mass and weight (if you do need the weight rather than the mass) using the formula:
Weight (W) = mass x gravity
W = 0.2 kg x 9.8 m/sec2
W = 1.96 N
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