Gigawatts to BTU (IT) per second converter above calculates how many BTU (IT) per second are in 'X' gigawatts (where 'X' is the number of gigawatts to convert to BTU (IT) per second). In order to convert a value from gigawatts to BTU (IT) per second (from GW to BTU/s) type the number of GW to be converted to BTU/s and then click on the 'convert' button.