Microwatts to calories per hour conversion calculator above calculates how many calories per hour are in 'X' microwatts (where 'X' is the number of microwatts to convert to calories per hour). In order to convert a value from microwatts to calories per hour (from μW to cal/h) simply type the number of μW to be converted to cal/h and then click on the 'convert' button.