About

Switching from Liquefied Petroleum Gas (LPG/Propane) to Natural Gas (Methane), or vice versa, is not a 1:1 volume exchange. LPG is significantly denser and contains more energy per unit of volume than Natural Gas. A boiler tuned for Natural Gas requires a different flow rate to achieve the same heating output as one running on LPG.

This tool calculates the Energy Equivalent. It answers: "If I use 100 liters of LPG, how many cubic meters of Natural Gas do I need to get the same heat?" This is critical for sizing pipes, estimating bills, and calibrating burners during fuel conversion projects.

Formulas

The calculation first converts the input volume/mass into a common energy unit (Kilowatt-hours), then divides by the energy density of the target fuel.

E_total = Volume_in × CalorificValue_in

Volume_out = E_totalCalorificValue_out

Note: Constants used are approximations: LPG Liquid (7.1 kWh/L), Natural Gas (10.55 kWh/m³).

Reference Data

Fuel Type	State	Unit	Energy Content (Avg)
Natural Gas (Methane)	Gas	1 m³	10.5 - 11 kWh
Natural Gas (Methane)	Gas	1 ft³	0.29 - 0.31 kWh
LPG (Propane)	Liquid	1 Liter	7.1 kWh
LPG (Propane)	Gas	1 m³	26 kWh
LPG (Propane)	Mass	1 kg	13.6 kWh

Frequently Asked Questions

LPG is stored as a liquid under pressure or a dense vapor. It has a much higher energy density. You typically need about 2.5 to 3 times the volume of Natural Gas to equal the energy in gaseous LPG.

Yes. First, convert your consumption to kWh using this tool. Then, check your local supplier rates (Price per kWh) to compare costs accurately, rather than comparing price per liter vs price per cubic meter.

Energy content varies slightly by region and gas mix (e.g., Propane vs Butane ratio in LPG). This tool uses standard international averages suitable for estimation.

No. This tool compares the raw fuel energy. If you change boilers, the new appliance efficiency will also affect your final consumption.