Hectopascals to decibars conversion calculator above calculates how many decibars are in 'X' hectopascals (where 'X' is the number of hectopascals to convert to decibars). In order to convert a value from hectopascals to decibars (from hPa to dbar) just type the number of hPa to be converted to dbar and then click on the 'convert' button.