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Gas Cylinder Duration Calculator

Work out gas cylinder duration instantly with clear inputs, formula shown and shareable results.

About Gas Cylinder Duration Calculator

LPG holds about 13.8 kWh per kilogram, so a 13 kg cylinder stores roughly 180 kWh. Dividing by the appliance rating gives burn hours: a 7 kW heater consumes about 0.5 kg per hour and empties the cylinder in around 26 hours of continuous use.

Formula

Cylinder duration

energy = mass x calorific value; hours = energy / appliance kW; kg per hour = kW / calorific value

Worked example

With the default values below, Gas Cylinder Duration Calculator returns Cylinder duration of 10.25. Change any input above and every figure here is recalculated in your browser.

Inputs used

Cylinder size
13 kg
Appliance rating
7 kW
Use per day
2.5 h/day
LPG energy content
13.8 kWh/kg

Results

Cylinder duration
10.25 days
Total burn hours
25.63 h
Consumption rate
0.51 kg/h
Total energy
179.40 kWh

Step by step

  1. 1Values used
  2. 2Cylinder duration
  3. 3Cylinder duration= 10.25 days
  4. 4Total burn hours= 25.63 h
  5. 5Consumption rate= 0.51 kg/h
  6. 6Total energy= 179.40 kWh

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How do I check how much is left?

Weigh the cylinder and subtract the tare weight stamped on the collar. Warm water down the side also reveals the liquid level by the temperature change.

Does a cylinder run out faster in cold weather?

The gas draw-off rate falls in cold weather because vaporisation slows, so a large appliance may not get full flow even with gas remaining.

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