How many kilograms are in 12 liters of LPG?

"Liters to Kilograms" Calculator
How many kilograms in
L

How many kilograms are in 12 liters of LPG?

Answer

12 liters of LPG weighs
6.12 kg

The density of LPG is 0.51 kg/L (liquid phase at 15 °C: propane 0.5076, n-butane 0.5845. A propane–butane mix has no single density — it depends on the blend). The source gives a band of 0.508–0.585 kg/L.

How the mass of 12 liters of LPG was worked out

mass = volume × density

0.51 kg/L × 12 L

=

6.12 kg

The density comes from ISO 3993:1984. Liquid phase at 15 °C: propane 0.5076, n-butane 0.5845. A propane–butane mix has no single density — it depends on the blend.

Why a liter and a kilogram are not the same thing

A liter measures volume, a kilogram measures mass, and density is what ties them together: how many kilograms one liter of this particular substance comes to. The coincidence that makes people treat them as one thing is historical — in 1795 the gram was defined as the mass of one cubic centimeter of water, so a liter of water weighed a kilogram by construction. For anything else the equality breaks.

The extremes of this page make it obvious: one liter of LPG weighs 0.51 kg, while one liter of densely packed sand weighs 2 kg — four times more at the very same volume.

If the substance is not known in advance, start from how many kilograms are in 12 liters — the same volume across every substance at once.

The other way round: how much room a kilogram takes

This page starts from a volume and answers in kilograms. The opposite question — how many liters a given mass comes to — is what the kilograms to liters calculator is for. Both read the same density table, so the two pages agree wherever the answer is volume times density.

For LPG that means 12 liters weighs 6.12 kg here, and one kilogram of it takes 1.96 liters there.

Related Calculations

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About "Liters to Kilograms" Calculator

This calculator converts liters to kilograms through the density of the substance: mass equals volume times density. A liter on its own has no weight — a liter of water weighs almost exactly a kilogram, a liter of honey close to one and a half, and a liter of gasoline about three quarters. For example, it can help you find out how many kilograms are in 12 liters of LPG? (The answer is: 6.12). For bulk materials — cement, sand, soil, coal, vegetables — density depends on how the material is packed, so the page prints a range and names the state it was measured in, instead of passing one number off as a physical constant.
"Liters to Kilograms" Calculator
How many kilograms in
L

How much 12 liters of each substance weighs

SubstanceMassDensity, kg/L
Beer12.1 kg1.01
Cement15–16.8 kg1.25–1.4
Coal7.8–15.2 kg0.654–1.266
Cucumbers7.44–7.68 kg0.62–0.64
Diesel10 kg0.834
Gasoline8.88 kg0.74
Honey17 kg1.42
Juice12.7 kg1.06
LPG6.12 kg0.51
Milk12.4 kg1.03
Mineral spirits9.36 kg0.78
Motor oil10.2 kg0.85
Sand19.8–24 kg1.65–2
Soil15.6–18 kg1.3–1.5
Sugar8.6–10.8 kg0.72–0.9
Tomatoes6.6–7.2 kg0.55–0.6
Vegetable oil11 kg0.92
Wall primer12 kg1
Water12 kg0.998

FAQ

How many kilograms are in 12 liters of LPG?

12 liters of LPG weighs 6.12 kg

How do you work out the mass of 12 liters of LPG?

Mass equals volume times density. The density of LPG is 0.51 kg/L and the volume is 12 liters, which gives 6.12 kg.

How accurate is the density of LPG?

The figure comes from ISO 3993:1984. Liquid phase at 15 °C: propane 0.5076, n-butane 0.5845. A propane–butane mix has no single density — it depends on the blend. Within the band of 0.508–0.585 kg/L the answer shifts a little, and at household volumes that shift is usually smaller than the error of a kitchen scale.

Is 12 liters of LPG heavier or lighter than water?

LPG has a density of 0.51 kg/L against 0.998 for water, so the same 12 liters weighs 6.12 kg instead of 12 kg. This is exactly why the everyday shorthand "a liter is a kilogram" only holds for water.

See Also