Kilopascals to inches of mercury conversion calculator shown above calculates how many inches of mercury are in 'X' kilopascals (where 'X' is the number of kilopascals to convert to inches of mercury). In order to convert a value from kilopascals to inches of mercury (from kPa to inHg) simply type the number of kPa to be converted to inHg and then click on the 'convert' button.