How much does 1 gallon of propane weigh?

"Gallons to Pounds" Calculator
How many pounds in
gal

How much does 1 gallon of propane weigh?

Answer

1 US gallon of propane weighs
4.24 lbs

The density of propane is 0.5076 kg/L (liquid propane at 15 °C, or 59 °F; it gets lighter as it warms), so one US gallon of it weighs 4.24 lbs.

In imperial (UK) gallons of 4.54609 L instead of 3.785411784 L, 1 UK gallon of propane would weigh 5.09 lbs.

How the weight of 1 gallon of propane was worked out

pounds = gallons × density (kg/L) × 3.785411784 ÷ 0.45359237

A US gallon is exactly 3.785411784 liters and a pound is exactly 0.45359237 kilograms, so the density in kilograms per liter turns into pounds per gallon by multiplying by the first and dividing by the second.

1 gal × 0.5076 kg/L × 3.785411784 ÷ 0.45359237

≈

4.24 lbs

(four point two four lbs)

The density comes from ISO 3993:1984: liquid propane at 15 °C, or 59 °F; it gets lighter as it warms.

Why the same gallon weighs differently

A gallon measures volume, a pound measures weight, and density is what ties them together: how many pounds one US gallon of this particular substance comes to. Water is the everyday reference at 8.33 lbs per gallon, and everything else sits above or below it.

Across this page the spread is wide: one US gallon of propane weighs 4.24 lbs, one US gallon of milk 8.6 lbs — at the very same volume.

If the substance is not known in advance, start from how many pounds 1 gallon is — the same volume across every substance at once.

The other way round: how many gallons a weight fills

This page starts from a volume and answers in pounds. The opposite question — how many gallons a given weight comes to — is what the pounds to gallons calculator is for, and in metric units the same question is kilograms to liters. All of them read one density table, so their numbers agree.

For propane that means 1 gallon weighs 4.24 lbs here, and one pound of it fills 0.24 gallons there.

Related Calculations

See Also

  • Pounds to Gallons - How many gallons a pound of water, milk, oil or propane takes — by density
  • Liters to Pounds - How much a liter of water, gasoline or propane weighs in pounds — by density
  • Liters to Kilograms - How many kilograms are in a liter of water, honey, gasoline, sand and other substances — by density
  • Gallons to Liters - Convert US Gallons to Liters
  • Lbs to Kg - Convert Pounds to Kilograms

About "Gallons to Pounds" Calculator

This calculator converts US gallons to pounds through the density of the substance: weight equals volume times density. A gallon on its own has no weight — a gallon of water weighs 8.33 lbs, a gallon of gasoline 6.18 lbs and a gallon of propane only 4.24 lbs. When no substance is named, the answer is for water, and the table shows every other liquid next to it. For example, it can help you find out how much does 1 gallon of propane weigh? (The answer is: 4.24). The gallon here is the US liquid gallon of 231 cubic inches; the imperial gallon used in the UK is a fifth larger, and every result page names what the same number of imperial gallons would weigh.
"Gallons to Pounds" Calculator
How many pounds in
gal

How much 1 gallon of each substance weighs

SubstanceWeight of 1 gallonDensity, kg/L
Diesel6.96 lbs0.834
Gasoline6.18 lbs0.74
Milk8.6 lbs1.03
Propane4.24 lbs0.5076
Vegetable oil7.68 lbs0.92
Water8.33 lbs0.998

FAQ

How much does 1 gallon of propane weigh?

1 US gallon of propane weighs 4.24 lbs

How do you work out the weight of 1 gallon of propane?

Weight equals volume times density. The density of propane is 0.5076 kg/L and a US gallon is exactly 3.785411784 liters and a pound is exactly 0.45359237 kilograms, so 1 gallon weighs 4.24 lbs — the figure is rounded, so multiplying the printed numbers can differ in the last digit.

How accurate is the density of propane?

The figure comes from ISO 3993:1984: liquid propane at 15 °C, or 59 °F; it gets lighter as it warms. It is the one figure every number on this page is computed from.

Is 1 gallon of propane heavier or lighter than water?

Propane has a density of 0.5076 kg/L against 0.998 for water, so the same 1 gallon weighs 4.24 lbs instead of 8.33 lbs — lighter.

See Also