Nanowatts to ergs per hour conversion calculator shown above calculates how many ergs per hour are in 'X' nanowatts (where 'X' is the number of nanowatts to convert to ergs per hour). In order to convert a value from nanowatts to ergs per hour (from nW to erg/h) simply type the number of nW to be converted to erg/h and then click on the 'convert' button.