Water Intake Calculator

A common guideline for daily hydration is about 35 milliliters of water per kilogram of body weight. This calculator applies that rule to give you a personal daily target in milliliters.

Your real needs rise with exercise, heat and altitude — add roughly 500 ml per hour of intense activity. Remember that food, especially fruit and vegetables, also contributes to your total intake. Consistent hydration supports energy levels, digestion and concentration throughout the day.