How to convert gas m³ to kWh
A step by step guide for business energy customers. Learn how to convert gas usage from cubic metres (m³) or cubic feet (ft³) into kilowatt-hours (kWh). Includes easy formulas, examples, and tips on calorific value and correction factors for both metric and imperial meters.
In this article
Why convert m³ gas units into kWh?
Why convert m³ gas units into kWh?
Gas meters measure volume in cubic metres (m³), whereas your bills and energy use are shown in kilowatt-hours (kWh). Converting m³ into kWh helps you check bills, compare tariffs and understand how much energy you’re using. It’s the best way to check that estimated bills are accurate and to compare energy prices fairly. With the right conversion, you’ll have a clear picture of your usage and costs, making it easier to stay in control.
Quick conversion checklist
- Get your most recent meter reading from your online account and compare it to your previous one
- Work out the difference between your current and previous meter reading - that is your gas use in m³
- Do you have a metric or imperial meter? You can check using the videos on How to read your meter
- Apply the correction factor and calorific value (CV)
- Convert to kWh using the formula
Metric and imperial gas meters
There are two types of gas meters.
- Metric meters
measure gas use in cubic metres (m³) - Imperial meters
measure gas use in cubic feet (ft³). You will need to convert your readings from ft³ to m³.
Convert from cubic feet (ft³) to cubic metres (m³)
To convert gas readings from cubic feet (ft³) to cubic metres (m³), you simply multiply by 0.0283.
ft³ reading × 0.0283 = m³
Knowing which type you have is essential for accurate conversion. Depending on which meter you have, you’ll need to do a different calculation to convert your gas units to kWh.
How to convert gas m³ to kWh
If you have a metric gas meter, you can work out your gas usage in kilowatt-hours using this simple formula.
m³ used × calorific value × correction factor (1.02264) ÷ 3.6
- Work out the volume used. Subtract your current reading your previous reading
- Multiply by the calorific value. You’ll find this on your bill. You can find all your bills in your online account
- Apply the correction factor by multiplying by 1.02264. This accounts for temperature and pressure
- Convert to kWh by dividing the result by 3.6
If you’ve used 100 m³ of gas and your calorific value is 38
100 × 38 × 1.02264 ÷ 3.6 = 1,079.45 kWh
What is Calorific Value (CV)?
Calorific Value or CV, tells you how much heat your gas produces when it burns – it's a measure of quality. CV usually ranges between 37 and 43 megajoules per cubic metre. You’ll find this on your energy bill, typically in the section explaining how your gas usage is converted into kilowatt-hours (kWh). It’s shown alongside the correction factor and used in this formula.
m³ × CV × 1.02264 ÷ 3.6 = kWh
CVs are tested continuously at multiple points across the National Grid to ensure accuracy.
Frequently asked questions about converting gas use from m³ to kWh
How can I check my meter type?
Knowing which type you have is essential for accurate conversion. Depending on which meter you have, you’ll need to do a different calculation to convert your gas units to kWh. If you have an imperial meter you will need to convert cubic feet (ft³) to cubic metres (m³).
What's the calorific value (CV) on my business gas bill?
CV stands for Calorific Value. It measures how much energy is in the gas you use. You’ll find it on your bill. It usually sits within a typical range set by your supplier and region. It can change slightly depending on where you live or who supplies your gas.
We use CV to convert your gas usage into kilowatt-hours (kWh). The calculation gives an estimate, but it’s almost always very close to the amount you’re billed for – so you can trust it’s accurate.
Can I convert gas usage without a calculator?
Yes – but it’s not easy. The formula is...
Volume × Correction Factor × Calorific Value ÷ 3.6
Doing this by hand means working with decimals, so it can be time-consuming. By calculating the formula manually, you’ll understand exactly how your usage is converted. However, it’s fiddly and prone to errors. Your result could differ from your bill, though it should be close. We recommend using a calculator or online tool – it’s much quicker.
What is the correction factor?
The correction factor (sometimes called correction value) is used when converting gas volume into energy (kWh). It accounts for variations in temperature and pressure that affect gas density.
The standard value is 1.02264 (sometimes shown as 1.0224).
It’s purpose is to ensure your conversion reflects real-world conditions, so your bill is accurate. It appears on your energy bill, usually alongside the calorific value (CV) in the conversion formula.
Does everyone use the same correction factor?
Not always. The correction factor adjusts for temperature and pressure, so it can vary slightly depending on conditions. Most suppliers use a standard value (1.02264) for simplicity, but small differences can occur so it’s best to check your bill for the most up-to-date value.
