Gas Meter Reading Conversion Calculator

Work out gas meter reading conversion instantly with clear inputs, formula shown and shareable results.

About Gas Meter Reading Conversion Calculator

Gas meters measure volume, but gas is billed on energy. The metered volume is first converted to cubic metres, then adjusted by a volume correction factor for temperature and pressure, then multiplied by the calorific value of the gas supplied. Dividing megajoules by 3.6 gives kilowatt-hours.

Formula

Gas billing conversion

Energy (kWh) = volume (m3) x volume correction factor x calorific value (MJ/m3) / 3.6

Worked example

With the default values below, Gas Meter Reading Conversion Calculator returns Energy Consumed of 11,220.633. Change any input above and every figure here is recalculated in your browser.

Inputs used

Metered Volumeminimum 0 m3: 1,000 m3
Volume Correction Factoraccepts 0.5–2: 1.02264
Calorific Valueminimum 0.01 MJ/m3: 39.5 MJ/m3
Meter Unitone of Cubic metres, Hundreds of cubic feet, Cubic feet: Cubic metres

Results

Energy Consumed: 11,220.633
Corrected Volume: 1,022.640
Volume In Cubic Metres: 1,000.000
Energy In Megajoules: 40,394.28

Step by step

1Values used
2Gas billing conversion
3Energy Consumed= 11,220.633
4Corrected Volume= 1,022.640
5Volume In Cubic Metres= 1,000.000
6Energy In Megajoules= 40,394.28

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 3 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

What is the volume correction factor?

It corrects metered volume to standard temperature and pressure. A typical UK figure is 1.02264 for a low-pressure domestic meter; correctors on industrial meters compute it live from measured conditions.

Why does the calorific value change?

It depends on the gas actually delivered, which varies with supply source. Network operators publish a declared calorific value for each billing zone and period.