What is the calorific value of natural gas?

The calorific value of natural gas varries between 34 and 38 MJ/m3. This variation depends on the composition and source of the gas. Generally, natural gas contains methane and other hydrocarbons, and the calorific value of every component varries. Natural gas that have more calorific value can be high expensive, and might not be the best efficient fuel for a specific application.