Atmospheres (technical) to decibars converter on this page calculates how many decibars are in 'X' atmospheres (technical) (where 'X' is the number of atmospheres (technical) to convert to decibars). In order to convert a value from atmospheres (technical) to decibars (from at to dbar) simply type the number of at to be converted to dbar and then click on the 'convert' button.