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How to Calculate Your Gas Usage
For Imperial and Metric Meters
So, your meter registers
meters cubed (m3) if your meter is metric
hundreds of cubic feet (ft3(x100)) if your meter is imperial
But then you’re billed in kWh!
So, how are you supposed to calculate your bill?
First, you need a minimum of 2 meter readings
‘Why’ will become apparent …
Note the dates of your readings so thatyou have a period of usage
If you want to calculate your hourly usage, you need the times of the readings also
Once you have these …
Minus the previous reading from the latest
Then minus the date and time of the previous reading from the latest
This is why you needed a minimum of 2
You now have …
The meters cubed or hundreds of cubic feet you have used
The timeframe within which they were used
Now you need to do the conversion …
Conversion Equation …
And for metric meters:
((((Hundreds of cubic feet x 2.83) x Adjustment Factor) x Calorific Value) / Conversion Factor)
For imperial meters:
(((Cubic meters x Adjustment Factor) x Calorific Value) / Conversion Factor)
What was that?
Adjustment Factor?
Calorific Value?
Conversion Factor?
If you have an imperial meter, first multiply your hundreds of cubic feet by 2.83
This is to convert it to m3 for the rest of the equation
The Adjustment Factor, AKA the Correction Factor is used to account for temperature and atmospheric conditions at your site
It’s usually 1.02264
Check your latest bill for the latest information
The Calorific Value is the amount of energy in your gas and it’s constantly monitored by TRANSCO (The National Grid)
It can range from 37.5 to 43.0
The Conversion Factor is just to convert seconds to hours
It’s 3.6
Here’s an example …
So your first reading is:
142406 (metric)
And your second is:
142424 (metric)
Firstly, minus 142406 from 142424 to get your m3 usage
Your result will be 18
Then multiply this by theAdjustment Factor (usually 1.02264)
Your result will be 18.40752
Next, multiply by your Calorific Value(we’ll use 39.3)
Your result will be 723.415536
Lastly, divide that by 3.6
And you’ll have 200.94876
And that’s how many kWh you have used!!!
Image courtesy of stockimages at FreeDigitalPhotos.net
So now you can …
Use your pence/kWh to calculate what that has cost you
Divide the number of kWh by the number of hours it took to use them to calculate your average kWh usage per hour
(If you remembered to take the times of the readings)
Happy Days!!!
Got a dispute with your provider?
Talks getting nowhere?
If all else fails, you can contact the Ombudsman:
Email: [email protected]
Phone: 0330 440 1624
Fax: 0330 440 1625
Textphone: 0330 440 1600
Office closed at the weekends, on bank holidays and between Christmas and New Year
Web: www.ombudsman-services.org/energy.html#
Hope this was helpful
Thanks for watching