How many pounds does a gallon of water weigh?

How many pounds does a gallon of water weigh? At 62 °F (17 °C), a US gallon of water weighs 8.34 pounds, or 3.78 kilograms, excluding the container’s weight. There is a 16 percent weight reduction when compared to the Imperial gallon.

How many pounds does a gallon of water weigh?

How much is a gallon of water?

There are a few things we should be clear about when discussing a gallon of water’s weight: 128 fluid ounces (3.785 litres) is the US standard for one gallon. However, in the United Kingdom, a gallon is defined as 160 fluid ounces or 4.546 litres.

For the sake of answering the question, “How much does a gallon of water weigh?” we will use the American gallon as our standard (128 fl oz).

How much does water weigh?

As long as a litre of water was considered to be 1 kilogram, it was considered to be 1 kilogram. The metric system’s neatness is its greatest asset: 1 cm3 of water is equal to 1 mL and 1 g. Water in 1000ml containers weighs one kilogram (1000g).

What is the weight of a gallon of water?

The average weight of a US gallon of water is roughly 8 pounds, but the actual weight varies on a number of variables, which we’ll go through today.

What changes the weight of water?

Whether you’ve ever boiled or frozen a cup of water, you know that water can change its state. Although these are extreme cases, even small changes in temperature have an impact on water’s behaviour and, as a result, it’s mass.

Atmospheric changes affect the water’s mass in the same way that they do on land, at the bottom of the ocean, or on the moon.

How does temperature affect the weight of water?

When water is heated, its energy level rises. In essence, water molecules become enraged and begin slamming into each other like a horde of irate Black Friday shoppers. Molecules now take up more space because they’re constantly moving around, high-kicking and elbowing each other, rather than sitting still. Increased heat (i.e., energy) causes water to become less dense. The distance between molecules widens.

Consequently, you will notice that a gallon pitcher filled with cold water from the tap is heavier than one filled with boiling water. A greater number of molecules can fit into a given volume (the gallon pitcher) because of the cold water’s higher density.


According to the US Department of Agriculture, a gallon of water weighs an average of 8 pounds, but the exact weight depends on a variety of factors. Like on land, at sea level, or even on the moon, atmospheric changes have a direct effect on water mass. Filling a gallon pitcher with cold tap water is easier than filling it with hot water.

How Much Does A 5 Gallon Of Water Weigh

Because a gallon of water weighs 8.35 pounds, five gallons of pure water weigh 42.7 pounds. A gallon of water weighs approximately how much? All a gallon of water weighs at the boiling point is 7.997 pounds. At room temperature, a cubic foot of water weighs 62.6 pounds.

However, the minerals dissolved in the saltwater give it a substantial mass. About 3.6 percent of the total weight of seawater is salt, which amounts to 4.6 ounces per gallon. Because saltwater is thick and able to lift objects with the gooiest force, a cubic foot of saltwater weighs about 65 pounds. As a result, abject float slightly better in saltwater.

In the United States, a US Liquid Gallon is a capacity unit. The legal definition of a US gallon is 20 cubic inches. Because the United States gallon is 3.786 litres smaller than the United States dry gallon and Imperial gallons, it is more convenient to use.

The US Dry Gallon is a standard measurement unit for agricultural products such as grains, berries, grapes, and apples in the United States. Imperial gallons are commonly used in the United States, and their legal definition is 277.5 inches cubed. The Imperial gallon is 4.81 quarts (4.55609 litres) in volume or 4.81 quarts.

Compared to the United States’ liquid and dry gallon, the Imperial Gal is the most expensive of the three. At a temperature of 63 degrees Fahrenheit, the Imperial Gallon weighs between 10 and 11 pounds.


5 gallons of pure water weighs in at 42.7 lbs. The weight of a cubic metre of salt water is approximately 65 pounds. Because the US gallon is smaller by 3.786 litres than the US dry gallon and Imperial gallons, it is more convenient to transport and use around the United States.

How Much Gallon Bucket Of Water Weigh

The old saying goes, “A pint’s a pound, the world around us.” Based on this figure, a pint of water is approximately the same weight as a pound of water. A gallon of water weighs 8.336 pounds at 62 degrees Fahrenheit, which is very close to this figure. There are 1.04375 pounds in a pint.

To be crystal clear, volume refers to the amount of three-dimensional space occupied by a given object. Gravity is the force exerted on an object by gravity.

As an example, a gallon of water will weigh less than a gallon of loose fall leaves in a gallon bucket. While they both take up the same amount of space, they are not the same weight.

The gallon bucket of leaves is less dense than the water, which has a higher density. Crushing the leaves into small pieces and packing more leaves into a gallon volume until you can no longer fit any more leaves into the bucket will increase the density of the leaves.
Trying to squeeze more things into a small area is a common occurrence during the fall clean-up. The leaves in your bucket have now become denser.

In short

At 62 degrees Fahrenheit, a gallon of water weighs 8.336 pounds. A pint has a weight of 1.04375 pounds. Despite occupying the same amount of space, the two items are quite different in terms of weight. Because the water is denser than the leaves in a gallon bucket, the leaves are lighter in weight.

Three Different Units of Gallon

  • Which unit of gallon you are using can make a difference. A gallon is defined in the United States in two ways. The US liquid gallon (the most commonly used measurement) has a volume of 231 cubic inches or 3.785 litres, and a mass of 8.344 pounds.

  • A US dry gallon is equal to 268.8025 cubic inches, or 4.405 litres, or 1/8 of a US bushel. At its heaviest density, a US dry gallon weighs 9.711 lbs.

  • The modern definition of a UK gallon or imperial gallon is exactly 4.54609 L or 10.02 lbs of water at its maximum density, as opposed to the original definition of a gallon as 10 pounds of water.

How Much Does One Molecule of H2O Weigh?

In chemistry, water is also known as H2O, or hydrogen and oxygen. This compound is made up of one oxygen atom bound to two hydrogens, making it an oxygen hydride.

The molar mass of each H2O molecule must first be determined in order to determine the molecule’s weight.

H2O Molar Mass

The molar mass of H2O can be determined by determining the mass of each element in the molecule and then calculating the sum.

There is a difference in the mass of hydrogen and oxygen. The molar mass formula for H2O is as follows because it contains two hydrogen atoms and one oxygen atom:

:arrow_right: H2O molar mass = 1.00794 + 1.00794 + 15.9994

:arrow_right: H2O molar mass = 18.01528

Consequently, H2O has a molar mass of 18.01528 g/mol or 18.01528 grammes per mole of H2.

Avogadro’s constant, which states that one mole is equal to 6.02214076 1023 elementary units of matter, such as a molecule, can be used to determine the weight of a molecule after finding its molar mass. Scientific notation is commonly used to represent such a large number.

The formula for determining the weight of a single molecule of H2O is as follows:

:arrow_right: H2O molecule weight = 18.01528/6.02214076 × 1023

:arrow_right: H2O molecule weight = 2.9915 × 10-23 g

So, one molecule of H2O weighs 2.9915 × 10-23 grams.

Understanding a Gallon of Water Measurements

Exactly how much does a gallon of water weigh? Is there a real-world application for the concept of water’s mass? Water is essential to your health and well-being; you use it every day for everything from drinking and cooking to washing and decorating your home and garden.

How often do you need to know the weight of one gallon of water?

What is Weight?

But what exactly do we mean by “weight” when we talk about something like a person’s or a bag of flour’s weight?

What your high school science teacher explains to you about the force of the weight is the sum total of your body’s mass and that old standard of gravity. It follows that weight is also a measure of volume since mass and volume are linked.

In order to calculate the weight, you need to know how much water is in the container and how much it weighs.

What is Volume?

The amount of space occupied by something is referred to as its volume. When water freezes, it takes on a different volume, so most homeowners are concerned about their plumbing in the winter.

It’s difficult to measure volume because it depends on which system is most widely used in your country. Using international metric units, a litre of liquid or gas will have the same mass no matter where it is measured.

One litre of water equals one kilogramme when used as the unit of weight. Weight and volume are connected in the metric system.

Is a Pound Weight the Same Everywhere?

Because of the lower gravity on the moon, a pound’s weight is significantly reduced on a universal scale. Despite slight variations at the summit of Mt. Everest, a pound is consistently treated as the same weight here on Earth.

Pounds and ounces are the same between the United Kingdom and the United States, but hundredweights and tonnes are interpreted differently. Use the metric scale to avoid any misunderstandings when comparing the weights in the UK and the US.

What are Gallons?

Around 1824, the United States gallon and the United Kingdom gallon split up. In the United Kingdom, the gallon was originally measured in gallons, but in 1995, the metric system was switched to litres.

The US gallon is based on 231 cubic inches of volume. As a result, one-fifth more volume is in the gallon in the United Kingdom (and Canada). It’s also heavier.

Weight of a Gallon of Water in U.S. Measurements

Water in U.S. gallon converted into pounds, ounces, kilograms, and grams:

U.S. Gallons Pound Ounce Kilogram Gram
½ gallon 4.18 lb 67 oz 1.88 kg 1,893 g
1 gallon 8.34 lb 132 oz 3.78 kg 3,786 g
2 gallons 16.67 lb 265 oz 7.56 kg 7,571 g
3 gallons 24.98 lb 398 oz 11.36 kg 11,354 g
4 gallons 33.33 lb 534 oz 15.15 kg 15,142 g
5 gallons 41.65 lb 665 oz 18.93 kg 18,926 g
6 gallons 49.97 lb 796 oz 22.72 kg 22,712 g
7 gallons 58.32 lb 932 oz 26.48 kg 26,496 g
8 gallons 66.63 lb 1,065 oz 30.27 kg 30,281 g
9 gallons 74.96 lb 1,196 oz 34.05 kg 34,064 g
10 gallons 83.31 lb 1,332 oz 37.84 kg 37,852 g
11 gallons 91.63 lb 1,464 oz 41.64 kg 41,636 g
12 gallons 99.97 lb 1,595 oz 45.43 kg 45,421 g
13 gallons 108.28 lb 1,728 oz 49.22 kg 49,204 g
14 gallons 116.63 lb 1,863 oz 52.98 kg 52,992 g
15 gallons 124.96 lb 1,994 oz 56.76 kg 56,774 g
16 gallons 133.27 lb 2,127 oz 60.57 kg 60,562 g
17 gallons 141.62 lb 2,262 oz 64.35 kg 64,346 g
18 gallons 149.95 lb 2,395 oz 68.12 kg 68,132 g
19 gallons 158.27 lb 2,527 oz 71.91 kg 71,915 g
20 gallons 166.60 lb 2,660 oz 75.70 kg 75,700 g
25 gallons 208.25 lb 3,325 oz 94.62 kg 94,625 g
30 gallons 249.90 lb 3,990 oz 113.55 kg 113,550 g
35 gallons 291.55 lb 4,655 oz 132.47 kg 132,475 g
40 gallons 333.20 lb 5,320 oz 151.40 kg 151,400 g
45 gallons 374.85 lb 5,985 oz 170.32 kg 170,325 g
50 gallons 416.50 lb 6,650 oz 189.25 kg 189,250 g
55 gallons 458.15 lb 7,315 oz 208.17 kg 208,175 g
60 gallons 499.80 lb 7,980 oz 227.10 kg 227,100 g
65 gallons 541.45 lb 8,645 oz 246.02 kg 246,025 g
70 gallons 583.10 lb 9,310 oz 264.95 kg 264,950 g
75 gallons 624.75 lb 9,975 oz 283.87 kg 283,875 g
80 gallons 666.40 lb 10,640 oz 302.80 kg 302,800 g
85 gallons 708.05 lb 11,305 oz 321.72 kg 321,725 g
90 gallons 749.70 lb 11,970 oz 340.65 kg 340,650 g
95 gallons 791.35 lb 12,635 oz 359.57 kg 359,575 g
100 gallons 833 lb 13,300 oz 378.50 kg 378,500 g
200 gallons 1,666 lb 26,600 oz 757 kg 757,000 g
300 gallons 2,499 lb 39,900 oz 1,135 kg 1,135,500 g
400 gallons 3,332 lb 53,200 oz 1,514 kg 1,514,000 g
500 gallons 4,165 lb 66,500 oz 1,892 kg 1,892,500 g
1000 gallons 8,330 lb 133,000 oz 3,785 kg 3,785,000 g

Weight of a Gallon of Water in U.K./Canadian Measurements

Water in UK/CA gallon (also known as the Imperial gallon) converted into pounds, ounces, kilograms, and grams:

UK/CA Gallons Pound Ounce Kilogram Gram
½ gallon 5 lb 82 oz 2.27 kg 2,272 g
1 gallon 10 lb 161 oz 4.54 kg 4,547 g
2 gallons 20 lb 320 oz 9.10 kg 9,092 g
3 gallons 30 lb 480 oz 13.63 kg 13,638 g
4 gallons 40 lb 640 oz 18.18 kg 18,184 g
5 gallons 50 lb 800 oz 22.73 kg 22,730 g
6 gallons 60 lb 960 oz 27.27 kg 27,276 g
7 gallons 70 lb 1,120 oz 31.82 kg 31,822 g
8 gallons 80 lb 1,280 oz 36.36 kg 36,368 g
9 gallons 90 lb 1,440 oz 40.91 kg 40,914 g
10 gallons 100 lb 1,600 oz 45.46 kg 45,460 g
11 gallons 110 lb 1,760 oz 50 kg 50,006 g
12 gallons 120 lb 1,920 oz 54.55 kg 54,552 g
13 gallons 130 lb 2,080 oz 59.09 kg 59,098 g
14 gallons 140 lb 2,240 oz 63.64 kg 63,644 g
15 gallons 150 lb 2,400 oz 68.19 kg 68,190 g
16 gallons 160 lb 2,560 oz 72.73 kg 72,736 g
17 gallons 170 lb 2,720 oz 77.28 kg 77,282 g
18 gallons 180 lb 2,880 oz 81.82 kg 81,828 g
19 gallons 190 lb 3,040 oz 86.37 kg 86,374 g
20 gallons 200 lb 3,200 oz 90.92 kg 90,920 g
25 gallons 250 lb 4,000 oz 113.65 kg 113,650 g
30 gallons 300 lb 4,800 oz 136.38 kg 136,380 g
35 gallons 350 lb 5,600 oz 159.11 kg 159,110 g
40 gallons 400 lb 6,400 oz 181.84 kg 181,840 g
45 gallons 450 lb 7,200 oz 204.57 kg 204,570 g
50 gallons 500 lb 8,000 oz 227.30 kg 227,300 g
55 gallons 550 lb 8,800 oz 250.03 kg 250,030 g
60 gallons 600 lb 9,600 oz 272.76 kg 272,760 g
65 gallons 650 lb 10,400 oz 295.49 kg 295,490 g
70 gallons 700 lb 11,200 oz 318.22 kg 318,220 g
75 gallons 750 lb 12,000 oz 340.95 kg 340,950 g
80 gallons 800 lb 12,800 oz 363.68 kg 363,680 g
85 gallons 850 lb 13,600 oz 386.41 kg 386,410 g
90 gallons 900 lb 14,400 oz 409.14 kg 409,140 g
95 gallons 950 lb 15,200 oz 431.87 kg 431,870 g
100 gallons 1,000 lb 16,000 oz 454.60 kg 454,600 g
200 gallons 2,000 lb 32,000 oz 909.20 kg 909,200 g
300 gallons 3,000 lb 48,000 oz 1,363 kg 1,363,800 g
400 gallons 4,000 lb 64,000 oz 1,818 kg 1,818,400 g
500 gallons 5,000 lb 80,000 oz 2,273 kg 2,273,000 g
1000 gallons 10,000 lb 160,000 oz 4,546 kg 4,546,000 g

Does the Weight of Water Change When Frozen?

If you cool water to 4 degrees Celsius (39.2 degrees Fahrenheit), it will behave like any other liquid. At this temperature, water molecules are the closest they have ever been because of the compression caused by the colder temperatures.

Even though most substances have reached their solid state, water has not yet reached its freezing point of 0°C (32°F). Water’s crystalline structure involves the molecules separating as it transitions from a liquid state to a solid-state.

A gallon of frozen milk weighs less than a gallon of liquid milk because it has 9% more volume than water and is thus 9% denser. This is great news for fish and frogs because it means that the bottom of a pond or lake can remain liquid throughout the winter.

Wouldn’t it be cool if water behaved like all other liquids and the ice sank? It’s bad news for fish and for the rest of the Earth’s inhabitants, as well. However, water’s unique properties allow us to live even in the most inhospitable conditions.

Frequently Asked Questions

Following are some frequently asked questions related to how many pounds does a gallon of water weigh.

1. Which is heavier a gallon of milk or water?

It is a volume measurement, and density is directly proportional to the mass of a constant volume. Milk is made up of about 87 percent water and other heavier-than-water substances, excluding fat. The weight of a gallon of milk versus a gallon of water is approximately the same.

2. Is a gallon of water 5 pounds?

The answer to this question has been estimated by some to be anywhere from 5 to 15 pounds. How much does a gallon of water weigh? It’s a simple answer: 8.3 pounds. Imperial gallons of water has a maximum density of 10.02 pounds, whereas US dry gallons of water has a maximum density of 9.71 pounds.

3. Does a gallon of water weigh the same frozen?

One gallon of water (128 US fluid ounces) frozen to a solid has the same weight in both the liquid and solid-state. However, a gallon of water frozen solid has a greater volume than a gallon of water liquid. When water freezes, it expands.

4. Does urine weigh more than water?

Due to the fact that urine does not only contain water but also waste products, it has a higher density. A gramme per cubic centimetre is all that separates it from water.

5. What is the heaviest liquid on Earth?

What is the world’s heaviest liquid? For a given set of temperatures and pressures, mercury is the densest liquid (STP). Mercury, also known as “quicksilver,” has been around for at least 3,500 years. In industry, it is an essential metal, but it is also highly toxic.

6. How heavy is a gallon of sand?

Sand is approximately 12.5 pounds per gallon (5.6 kg). The weight of the sand is affected by a variety of factors, including its moisture content, composition, and particle size.

7. Do water and ice weigh the same?

Water and ice do not have the same weight. For example, water weighs more than ice. For example, if we put the same volume of each in the same container, Because ice has a lower density than water, it floats on water.

8. How much does 1 gallon of wine weigh?

A US gallon of wine weighs somewhere between 8.34 pounds and 9.0 pounds (or 3.791 kilogrammes and 4.091 kilogrammes).

9. Is an ice cube heavier than water?

When water is at room temperature, its density is about 1 gramme per millilitre, but this can vary depending on the temperature or the substances dissolved in the water. Because ice has a lower density than liquid water, it floats in your drink.

10. Does hot water weigh more than cold water?

Water, like air, expands as it warms up, making it less dense. When cold water (below 32 degrees Fahrenheit) and hot water (above 140 degrees Fahrenheit) are compared, cold water weighs more.


To answer the question of how many pounds does a gallon of water weigh, we have concluded in this article that 3.785 kilogrammes (kg) are the room-temperature weight of one US liquid gallon of fresh water, which we calculated to be 8.34 pounds (lb).

Related Articles

How Much Does 40 Gallons Of Water Weigh
How Many Ounces in a Gallon of Water?
How Many Pounds Is 5 Gallons