LPG calculator

Liquefied petroleum gas - propane/butane - pipe size, heat power

online since 2007

pipe flow calculator

Calculator start selection

Read all about available deployments. In any way of utilizing calculator, Internet connection is not required, but nice to have for authentication at least.

Available in download version

save/open multiple results
export to Word and Excel
print results
create list of custom fluid properties
resistance factor K for flow in valves and fittings
pipe surface roughness selection
pipe material selection
select between gauge and absolute pressure
compressible isothermal flow
dry air isothermal flow
gas offtake flow
natural gas flow


pipe network analysis

Why you should use this calculator?

The calculator can be used for estimation of flow rate, pipe diameter and heat power of liquefied petroleum gas - LPG. Liquefied petroleum gas is a mixture of propane, butane, and other components. As an example, you can use the calculator to determine the necessary flow rate of an LPG in a gas furnace, for required burner heat power.

How is the calculation executed?

The calculator is applicable for calculation of flow rate and heat power of gas and liquid phase of LPG. It can be used for calculation of clear propane or clear butane gas flow as well.

Propane and butane in a gas state are compressible. The calculator considers LPG as incompressible which is correct only for LPG liquid state. All physical properties, like mixture density or LPG component partial pressure, are calculated for the selected propane-butane mixture ratio.

The calculator can be used for computation of pipe diameter when the flow rate is known. The flow rate of LPG can be presented as mass flow rate, volume flow rate of the liquid phase or as a volume flow rate of the gas phase at standard conditions.

With the calculator, you can convert between mass and volume flow rate (liquid or gas phase). The calculator calculates a gas phase flow rate of LPG at normal conditions: pressure (atmospheric) p = 101325 Pa and temperature T=273.15 K

When is this calculator not relevant?

You can't use this calculator to calculate pressure drop through the pipe line. For that purpose please select pressure drop calculator for liquids or for gases.

Need a helping hand?


If you need a quick calculation, but you are not still familiar how to use the calculator, you can order calculation service from the calculator developer.

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