Daily Water Intake Calculator

A common guideline is 35 ml per kg of body weight. For a 70 kg adult in a temperate climate with moderate activity, that is about 2.8–3.0 litres per day. Hot climates and intense exercise increase the requirement significantly.

Yes, caffeinated drinks contribute to hydration, though they have a mild diuretic effect. Water, herbal teas, and water-rich foods (fruits, vegetables) all count. Alcohol does not count — it increases fluid loss.

Vietnam's tropical climate means higher temperatures and humidity year-round, especially in the south. Sweating increases significantly, so the body needs more water to maintain core temperature and replace lost fluids. The calculator adds 500 ml for hot/humid climates.