The objective of this paper is to investigate the determinants of unpaid time in caring activities, with a special emphasis on the gender dimension. Data from the Household Panel Survey for Spain is used to estimate an ordered probit model for the hours interval in care of children and adult people in need of care. The results show that gender is one of the key determinants of the distribution of time in caring. Being in paid employment is also an important factor in the time devoted to caring. Demographic variables like age, marital status and education are also relevant, particularly in the case of women. Finally, cultural habits and customs are also important.