LPG Conversions: KG, Litres, MJ, kWh, BTU & M³
We are frequently asked about the various LPG conversion values for NZ LPG. People ask the questions in many ways and the simplest way to answer most of them is with a NZ LPG Conversion Table. The table shown covers most of the common units of measure and gas bottle-cylinder sizes for New Zealand. Please note that the data shown is for a NZ 60:40 Propane/Butane mix.
For 100% Propane LPG, please see LPG – Propane Conversion Table on our Australian web site.
A few LPG facts to note:
♦ Unlike water, one kilogram of LPG does NOT equal one litre of LPG. This is because the density or specific gravity of LPG is less than water. In New Zealnd, where LPG is a mixture of Propane and Butane, the value can vary slightly by mixture percentage. 1KG of 60:40 LPG has a volume of 1.86L. Conversely, 1L of 60:40 LPG weighs 0.54KG.
♦ 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 or Mj.
♦ Kilowatt per 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.
♦ BTU, or British Thermal Unit, is another older measure of heat output based on the Imperial System. One BTU is the energy required to raise the temperature of 1 pound of liquid water by 1°F, at sea level. 1MJ equals 948BTU, so to get an equivalent number of Megajoules, just divide the BTU rating by 948.
♦ A 60:40 mix of LPG expands about 330 times in volume when it goes from liquid to gas. So, 1L of liquid LPG equals 330L of gaseous LPG. As there are 1000L in a cubic meter (M3), 1L of liquid LPG expands to 0.33M3.
♦ 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.