Terms of use

The tools and materials provided from this page have been designed (on the whole) for engineers and are not neccessarily designed for end user operation.

They may require engineering judgment and personal verification of provided data. Although I have worked hard and made these tools as accurate and functional as possible, I provide no warranty on their accuracy or suitability.

All tools used from this page are done so at the user's own risk.

The geeky bit for gas engineers

Your Calorific value can be found on your gas bill, the entry should be in "MJ per m3" - The default 38.736 is provided as the UK average of "10.76J/kW" which most engineers will use. This calculator will treat the kW value as Gross and you may need to divide by 0.9 to get the m3/hr value for what we'd presume to be "useful" energy used (Depending on your application).

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Updated 04 October 2025 in general tools.

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