Ca udtrykkes da som g·kg-1 fedtindhold i organismen, og Cs som g·kg-1 organisk indhold i jorden; BSAF angives i enheder af kg organisk kulstof·kg-1 fedt.
Ca is then expressed as g·kg-1 lipid content of the organism, and Cs as g·kg-1 organic content of the soil; the BSAF has the units of kg OC·kg-1 lipid.