Calculate propane flow rate in gallons per hour from a burner BTU/hr rating, with pounds per hour and the propane used over a running time.

Gallons are liquid propane, not vapor volume.

The appliance’s rated input (on its label), not its heat output.

91,500 is the typical value for commercial propane (higher heating value). Change it only if your supplier gives another.

Propane used over a running time
Optional. Adds the propane used over this time. Blank = flow only.

Related Calculators

Propane Flow Rate Formula

The following equation is used to calculate the Propane Flow Rate.

FR = BTU / PEC
  • Where FR is the liquid-equivalent propane flow rate (US gal/hr)
  • BTU is the burner fuel-input rating (BTU/hr), not useful heat output
  • PEC is the propane heating value (BTU/US liquid gal) on the same HHV or LHV basis as the input rating

To calculate the flow rate, divide the burner BTU rating by the propane energy content.

What is a Propane Flow Rate?

Definition:

Propane flow rate typically refers to the volume of propane consumed per hour by a burner or appliance. Here it is liquid-equivalent consumption, not propane vapor volume; this energy-accounting estimate does not establish adequate tank vaporization, piping or regulator capacity.

How to Calculate Propane Flow Rate?

Example Problem:

The following example outlines the steps and information needed to calculate the propane flow rate.

First, determine the burner BTU rating. In this example, the burner has a rating of 30,000 BTU/hr.

Next, determine the propane energy content. In this example, assume an approximate commercial-propane HHV of 91,500 BTU/US liquid gal near 60°F on the same basis as the input rating.

Finally, calculate the flow rate using the formula above:

FR = BTU / PEC

FR = 30000 / 91500

FR ≈ 0.3279 gal/hr

FAQ

What factors can affect the propane flow rate?

The propane flow rate can be influenced by factors such as burner efficiency, fuel pressure, and ambient temperature. Variations in propane quality or system configuration may also affect the measured flow rate.

How can I optimize my propane usage?

To optimize propane usage, ensure that your burner is well-maintained and operating at peak efficiency. Have a qualified propane-service professional check or adjust the system according to manufacturer instructions.

What should I do if my calculated flow rate seems inaccurate?

If the calculated flow rate appears inaccurate, verify the selected solve mode, values, liquid-gallon units and matching heating-value basis. It may also be beneficial to consult a professional to ensure your system is operating correctly.