How much should you drink?
Water intake calculator
Weight, age, weather, activity: your personal guideline in litres and glasses.
The calculator follows the guideline values of the German Nutrition Society (DGE; about 1.5 litres of drinking fluid for adults) and the rule of thumb of 30 to 35 millilitres per kilogram of body weight for total intake. Heat, activity and breastfeeding raise the value, and a water-rich diet lowers it. Background in the guide How much water per day? and in the article Signs of dehydration.
