Calories (15 °C) to cubic feet of natural gas conversion calculator shown above calculates how many cubic feet of natural gas are in 'X' calories (15 °C) (where 'X' is the number of calories (15 °C) to convert to cubic feet of natural gas). In order to convert a value from calories (15 °C) to cubic feet of natural gas simply type the number of cal to be converted to cubic feet of natural gas and then click on the 'convert' button.