How to work out gas readings and usage from M3 and kWh?

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Hi. New to Ovo so just looking for some help to understand the readings below.

It says:

Opening reading on 7 july estimated 5157

Closing reading as of 28 july (you gave) 5177

Units used 221.15 kWh.

Am I looking at this wrong because surely the difference between these readings is 20 not 221.15???

TomThumbBest Answer

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Updated on 24/08/26 by Chris_OVO

@Tjw50 Hope I can shed some light on this for you

In short, Metered units are not the same as kWh units,

Units - Calorific value X 1.02264 ÷ 3.6 = kWh

20 X 39? X 1.02264 ÷ 3.6 = 221.5 kWh

(this close to midnight I think my maths is ok) lol

The conversion as stated by OVO is

We convert your metered gas units to kWh using the following formula:
Metered volume × metric conversion factor1 × daily calorific value2 × 1.02264 (volume correction) ÷ 3.6 = kilowatt hours (kWh) used.
1 We convert the gas use into kWh according to your meter type – 2.83 (imperial) or 1 (metric).
2 The calorific value of gas changes every day and can range from 37.5 to 43.0. To find out calorific values used to calculate your charges you can visit: www.nationalgridgas.com/data-and-operations/calorific- value-cv

Tom…