The methane number is one of the quality parameters of natural gas based on the EN 16726 standard. In the assignment, a comparison was made between the calculations of the methane number according to the simplified model and the SIST EN ISO 15403-1:2008 standard and according to the valid version of the SIST EN 16726:2016+ standard. A1:2018. The values of the methane numbers obtained with our own Excel program according to the EN 16726 standard agree very well with the results of the commercially available program of the EUROMOT association. The calculation of methane numbers in the Excel program is also suitable for natural gas-hydrogen mixtures. The obtained correlation between the methane number and the Wobbe index for different compositions of natural gas proves the non-linear relationship of the quantities.
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