For Antarctic sea ice, computing ice thicknesses from known parameters such as snow depth and ice freeboard is still in a developmental state. In this study, data from 16 Antarctic cruises – five cruises for the Weddell Sea sector, four cruises for the Bellingshausen and Amundsen Seas sector, one cruise for the Ross Sea sector, and six cruises for the Indian Ocean and Western Pacific Ocean sectors – which had measurements of surface elevation (or snow depth), ice freeboard (height above or below sea level of the ice surface) and ice thickness were compiled and standardized. Typically these data were measured by using ice augers to measure ice thickness, usually at 1 m intervals for distances nominally from 50 m to 100 m profiles. The snow depth and the ice freeboard were also measured at the same 1 m spacing. The relations between snow depth, ice/snow freeboard and ice thickness for each cruise were derived and analyzed. Those relations were separated in each sea sectors and seasons for the entire Antarctic. For this study, single mean values for each of the profiles (tens to hundred of meters) of ice thickness, elevation and ice freeboard were computed. The mean ice thickness was first estimated using an isostatic relationship with prescribed values for the snow, ice, water densities and the measured values of mean snow depth and mean ice freeboard. The second estimate of ice thickness computation took into account the increased density of flooded snow, if the ice freeboard was negative (below sea level). We found that errors in thickness prediction compared with measured values were excessive if the flooded condition of the surface was not taken into account. However, we also found, unlike for Arctic sea ice, that snow elevation and snow depth are well correlated for Antarctic sea ice. This correlation implies that snow elevation from satellite laser altimetry may alone suffice for the crucial estimate of snow depth, necessary for estimating ice thickness from space, over Antarctic sea ice. New algorithms for estimating Antarctic sea-ice thickness from snow elevation, derivable from satellite laser altimetry, will be presented.