Cubic feet of natural gas to tons of coal equivalent conversion calculator shown above calculates how many tons of coal equivalent are in 'X' cubic feet of natural gas (where 'X' is the number of cubic feet of natural gas to convert to tons of coal equivalent). In order to convert a value from cubic feet of natural gas to tons of coal equivalent type the number of cubic feet of natural gas to be converted to TCE and then click on the 'convert' button.