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