The U.S. National Academies of Sciences, Engineering, and Medicine determined that an adequate daily fluid intake is:
– 15.5 cups (3.7 liters) of fluids a day for men
– 11.5 cups (2.7 liters) of fluids a day for women
These recommendations cover fluids from water, other beverages and food. About 20% of daily fluid intake usually comes from food and the rest from drinks.
Studies have produced varying recommendations over the years. But your individual water needs depend on many factors, including your health, how active you are and where you live.
No single formula fits everyone. But knowing more about your body’s need for fluids will help you estimate how much water to drink each day.