Gigawatts to horsepower (metric) converter above calculates how many horsepower (metric) are in 'X' gigawatts (where 'X' is the number of gigawatts to convert to horsepower (metric)). In order to convert a value from gigawatts to horsepower (metric) (from GW to hp) just type the number of GW to be converted to hp and then click on the 'convert' button.