# LPG (propane) Gas Unit Conversions: Gas in kg, Litres, MJ, kWh & m³

## LPG Gas Unit Conversion Formulas (Metric):

• #### Convert LPG kg to BTU: 1 kg = 46,452 BTU of energy from LPG

The second table covers most of the units of measure and gas bottle sizes for the USA including Pounds, Gallons, BTU, Therms & ft³.
You can convert all combinations of Pounds, Gallons, BTU, Therms & ft³.

## LPG (propane) kg to litres: 1kg = 1.96L. Unlike water, 1 kg of LPG does NOT equal 1 L of LPG.  This is because the density or specific gravity of LPG is less than water. In Australia, where LPG is propane, 1 kg of LPG has a volume of 1.96 L. (1 kg LPG gas has 1.96 liters)

Conversely, 1 L of LPG weighs 0.51 kg.

## LPG Gas Consumption in Megajoules

Megajoules per Hour (MJ/hr) ratings on appliances actually indicate the gas consumption of the appliance, not the output.
It is often expressed as just MJ. In the USA, they use BTU as the unit of measure.

## Appliance Output in kWh

Kilowatt Hour (kWh) is how appliance output is measured. 3.6 MJ of input equals 1kWh of output at 100% efficiency.
However, no gas appliance is 100% efficient.
That is why we have Star Ratings, so we can compare relative efficiency between models.
Appliance output is often expressed as just kW.

## LPG Liquid to Gas Volume Expansion Gas Unit Conversion

LPG (propane) expands about 270 times in volume when it goes from liquid to gas.
So, 1L of liquid LPG equals 270L of gaseous LPG.
As there are 1000L in a cubic metre (m³), 1 L of liquid LPG expands to 0.27 m³.

## Gas Bottle Tare Weight

Tare weight is the empty weight of the gas bottle-cylinder.
Along with the gas bottle dimensions, they can vary greatly by manufacturer and date of manufacture.
For example, older bottles tend to be heavier than more recent versions.

## Measuring LPG by Pressure

When LPG (propane) is stored in a gas bottle, it is under pressure.

The term “pressure” refers to the average force per unit of area that the gas exerts on the inside walls of the gas bottle.

The pressure is measured in kilopascals (kPa).

“Bar” is yet another unit of measure for pressure.  1 Bar = 100 kPa, so it is metric based but not an SI unit of measure.

LPG pressure can vary greatly based on temperature.

The level of fill in the gas bottle comes into play when the LPG is being used, as it affects the rate of vapourisation.

As LPG is a liquefied gas, the pressure inside the cylinder will remain the same from full to empty (after the last of the liquid LPG is used), then the pressure will fall quickly as the last of the LPG vapour is used.

The use of Pressure as a measurement in LPG use is very limited.

A steady Pressure only shows that liquid LPG is inside the cylinder, and not how much liquid is left.

In the US, pressure is measured in pounds per square inch (psi).

Psi is defined as 1 pound of force applied per square inch.   As a comparison, 1 psi = 6.89476 kPa.

## LPG Gas Unit Conversion Table: kg, Litres, MJ, kWh & m³

Note that this chart is for propane LPG and the m3 column refers to gaseous LPG

## LPG Cylinder Capacity in Litres Comparison Chart

 LPG Cylinder Size in kg LPG Cylinder Capacity in Litres 3.7 7.25 8.5 16.6 15 29 18 35 45 88 90 176 210 411

## The capacity of an LPG cylinder in litres can change if sold by the kg, as propane has 1.96 L per kg whilst butane has only 1.724 L per kg. This is because the two gases have different specific gravity.

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## Propane Gas Unit Conversions Table: Pounds, Gallons, BTU, Therms & ft³

For our friends in the USA:

## Propane Gas Unit Conversion Formulas (US Units of Measure):

• ### Therms to BTU Gas Unit Conversion:  1 Therm = 100,067 BTU

*Note that these are Liquid to Gas unit conversions
Note that the ft3 column refers to gaseous propane

## 45 kg LPG Gas Bottles

45 kg gas cylinder sizes are the most common size for home use

This is the size used for our Home Gas Bottle Exchange Service

They are also used with our Automatic Tanker Delivery Service

A typical installation has two 45 kg gas bottles

Capacity: 88 litres

Diameter: 375 mm

Height: 1250 mm

## 90 kg LPG Gas Cylinders

90 kg gas cylinder sizes are the second most common size for home use

This size is commonly used with our Automatic Tanker Delivery Service

A typical installation has one cylinder

90 kg is also used with our Underground LPG Gas Storage System

Capacity: 176 litres

Diameter:  510 mm

Height:  1380 mm

## 210 kg LPG Gas Cylinders

210 kg gas cylinder sizes are provided for high volume use

Larger storage vessels are also available, when needed

Filling is via our Automatic Tanker Delivery Service

Capacity: 411 litres

Diameter:  760 mm

Height:  1450 mm