# The Gas (Calculation of Thermal Energy) Regulations 1996, Part I: Calculation of Pressure Conversion Factor


The pressure conversion factor is the number given by the following formula, namely—
1013.25+(M-A)1013.25 where—
M =the number of millibars in the pressure of the gas at the meter;
A =the number of millibars of pressure to be deducted from M on account of the height of the meter above mean sea level measured at Ordnance Survey datum given by the table below.
TABLE
Height above sea level in metres
Pressure in millibars to be deducted
Height above sea level in metres
Pressure in millibars to be deducted
Height above sea level in metres
Pressure in millibars to be deducted
≤0.0
0.00
>97.5≤100.0
12.021
>197.5≤200.0
24.041
>0.0≤2.5
0.301
>100.0≤102.5
12.321
>200.0≤202.5
24.342
>2.5≤5.0
0.601
>102.5≤105.0
12.622
>202.5≤205.0
24.643
>5.0≤7.5
0.902
>105.0≤107.5
12.922
>205.0≤207.5
24.943
>7.5≤10.0
1.202
>107.5≤110.0
13.223
>207.5≤210.0
25.244
>10.0≤12.5
1.503
>110.0≤112.5
13.523
>210.0≤212.5
25.544
>12.5≤15.0
1.803
>112.5≤115.0
13.824
>212.5≤215.0
25.845
>15.0≤17.5
2.104
>115.0≤117.5
14.124
>215.0≤217.5
26.145
>17.5≤20.0
2.404
>117.5≤120.0
14.425
>217.5≤220.0
26.446
>20.0≤22.5
2.705
>120.0≤122.5
14.725
>220.0≤222.5
26.746
>22.5≤25.0
3.005
>122.5≤125.0
15.026
>222.5≤225.0
27.047
>25.0≤27.5
3.306
>125.0≤127.5
15.326
>225.0≤227.5
27.347
>27.5≤30.0
3.606
>127.5≤130.0
15.627
>227.5≤230.0
27.648
>30.0≤32.5
3.907
>130.0≤132.5
15.927
>230.0≤232.5
27.948
>32.5≤35.0
4.207
>132.5≤135.0
16.228
>232.5≤235.0
28.249
>35.0≤37.5
4.508
>135.0≤137.5
16.529
>235.0≤237.5
28.549
>37.5≤40.0
4.808
>137.5≤140.0
16.829
>237.5≤240.0
28.850
>40.0≤42.5
5.109
>140.0≤142.5
17.130
>240.0≤242.5
29.150
>42.5≤45.0
5.409
>142.5≤145.0
17.430
>242.5≤245.0
29.451
>45.0≤47.5
5.710
>145.0≤147.5
17.731
>245.0≤247.5
29.751
>47.5≤50.0
6.010
>147.5≤150.0
18.031
>247.5≤250.0
30.052
>50.0≤52.5
6.311
>150.0≤152.5
18.332
>250.0≤252.5
30.352
>52.5≤55.0
6.611
>152.5≤155.0
18.632
>252.5≤255.0
30.653
>55.0≤57.5
6.912
>155.0≤157.5
18.933
>255.0≤257.5
30.953
>57.5≤60.0
7.212
>157.5≤160.0
19.233
>257.5≤260.0
31.254
>60.0≤62.5
7.513
>160.0≤162.5
19.534
>260.0≤262.5
31.554
>62.5≤65.0
7.813
>162.5≤165.0
19.834
>262.5≤265.0
31.855
>65.0≤67.5
8.114
>165.0≤167.5
20.135
>265.0≤267.5
32.155
>67.5≤70.0
8.415
>167.5≤170.0
20.435
>267.5≤270.0
32.456
>70.0≤72.5
8.715
>170.0≤172.5
20.736
>270.0≤272.5
32.757
>72.5≤75.0
9.016
>172.5≤175.0
21.036
>272.5≤275.0
33.057
>75.0≤77.5
9.316
>175.0≤177.5
21.337
>275.0≤277.5
33.358
>77.5≤80.0
9.617
>177.5≤180.0
21.637
>277.5≤280.0
33.658
>80.0≤82.5
9.917
>180.0≤182.5
21.938
>280.0≤282.5
33.959
>82.5≤85.0
10.218
>182.5≤185.0
22.238
>282.5≤285.0
34.259
>85.0≤87.5
10.518
>185.0≤187.5
22.539
>285.0≤287.5
34.560
>87.5≤90.0
10.819
>187.5≤190.0
22.839
>287.5≤290.0
34.860
>90.0≤92.5
11.119
>190.0≤192.5
23.140
>290.0≤292.5
35.161
>92.5≤95.0
11.420
>192.5≤195.0
23.440
>292.5≤295.0
35.461
>95.0≤97.5
11.720
>195.0≤197.5
23.741
>295.0
35.762

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Source: https://www.legislation.gov.uk/uksi/1996/439/schedule/part/I (the official version)
Page: https://openlegislation.uk/gas-calculation-of-thermal-energy-regulations-1996/schedule/part-I
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.