Health risk assessment requires the use of human exposure variables during the exposure characterization stage. The results are all the more specific to the situation when data characterizing the populations concerned can be utilized. Until now, while data on body mass, time-space budget, and food consumption were available for France, no data were available regarding body surface areas, even though these are used when exposure via skin contact is relevant. Body surface areas are also useful in other fields, particularly for adjusting certain cancer treatments. This article proposes an estimate of the body surface area of the French population, as no study provides this variable directly. To this end, after selecting an estimation model incorporating the weights and heights of the French population, recent data from the 2006 National Nutrition and Health Survey (ENNS) and pediatric health records collected in 2009 were used. The available data set did not allow for adjustments by age and sex. Consequently, the results are presented in the form of age groups to meet risk assessment needs. To facilitate the use of these data via a probabilistic approach, a probability distribution adjustment is proposed. The relationship between body surface area and body mass was also characterized using Spearman’s correlation coefficient. (R.A.)