One us gallon of water weighs roughly 8.33 pounds or 3.78 kilograms at room temperature. The an accurate weight of water different according come its level the density, which in turn depends ~ above its storage temperature.

You are watching: How many kg in a gallon of water

You deserve to learn an ext about the weight of water - and shot out ours water load calculator and also reference chart - when you dip your toe right into our handy guide below.


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How lot is a gallon of water?

If we're talking about the load of a gallon that water, we must be clear around what a gallon actually is.

In the US, a gallon is 128 fluid ounces, or 3.785 liters.

For the services of the question, 'How much does a gallon that water weigh?', we are going to focus on the American gallon (128 fl oz).

How much does water weigh?

People used to walk by the dominance that a liter of water sweet a kilogram. Simple, huh? The beauty of the metric system is in that tidiness: 1cm³ of water is 1ml, and also weighs 1g. Therefore 1L that water (1000ml) weighs 1kg (1000g).

And wouldn't it be exorbitant if it really was that straightforward?

What is the load of a gallon of water?

A us gallon that water weighs roughly 8lb, however the exact measurement really counts on a pair of environmental determinants that we'll to walk you through now.

What transforms the weight of water?

As you'll understand from cook water top top the hob, or freeze it into cubes, water can readjust its state. These are excessive examples, but even middle fluctuations in temperature do have actually an result on the behaviour, and therefore the weight, of water.

Similarly, just as the load of water would be various on land, at the bottom that the ocean, or top top the moon, atmospheric changes have an impact on its mass.

How walk temperature impact the weight of water?

When you warmth up water, you increase its energy. Basically, water molecules gain excited and start bashing every other roughly like a group of rabid shoppers on black Friday. The amount of room each molecule now needs is greater, due to the fact that they're spinning around, high-kicking and also elbowing one another, rather of standing calmly in line. So raising the energy (i.e. Heat) of water decreases its density. Molecules become much more spaced out.

Therefore, if you have actually a gallon pitcher the you fill with cold water indigenous the tap, it will certainly weigh much more than a pitcher of boil water. The density of the cold water is greater, so more molecules right in a given an are (the gallon pitcher) than would certainly be in the warm water.

The tl;dr variation ("too long; didn't read") is the hotter water weighs less, and also colder water weighs more.

I tried it myself in the kitchen just now, making use of a pint glass. A pint that cold water weighed 560g, however a pint of warm water weighed simply 530g. Less water fit in the glass. (I guess: v the lesson here is to order a pint of warmth beer if you're do the efforts to cut down top top alcohol, in i beg your pardon case, us Brits room some really health-conscious folks.)

Alright, but... Exactly how much does a gallon the water weigh?

Water is most dense when it's at 39.2ºF, or 4ºC. In ~ this temperature, a gallon that water weighs around 8.345lb. Rotate the heating method up come 200ºF though, and also a gallon that water will certainly weigh about 8.04lb. At room temperature (70°F or 21°C), a gallon the water weighs 8.33lb (3.78kg).

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Check out the recommendation table below to see exactly how gallons the water translate into pounds and also kilograms, and try out our water load calculator yourself! If you want to uncover out the load of any other liquids, offer our gallons to pounds converter a try.


Weight in pounds because that gallons of water Gallons of water Pounds Kilos
1 gallon8.33 lb3.78 kg
2 gallons16.66 lb7.56 kg
3 gallons24.99 lb11.33 kg
4 gallons33.32 lb15.11 kg
5 gallons41.64 lb18.89 kg
6 gallons49.97 lb22.67 kg
7 gallons58.3 lb26.45 kg
8 gallons66.63 lb30.22 kg
9 gallons74.96 lb34 kg
10 gallons83.29 lb37.78 kg
At room temperature (70°F or 21°C). Density of 0.998g/cm³

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Convert gallons of water come weight

Convert gallons the water come pounds, ounces, grams and kilograms using the calculator below. This links in come our water load calculator.


Water temperature:32°F / 0°C39.2°F / 4.0°C40°F / 4.4°C50°F / 10°C60°F / 15.6°C70°F / 21°C (room temp)80°F / 26.7°C90°F / 32.2°C100°F / 37.8°C120°F / 48.9°C140°F / 60°C160°F / 71.1°C180°F / 82.2°C200°F / 93.3°C212°F / 100°C