Water Intake Calculator – Your Daily Hydration Goal

Individual needs vary, but a good personalised estimate is 33 ml per kg of body weight as a baseline. A 70 kg adult needs about 2.3 L before accounting for exercise or climate. The popular "8 glasses a day" rule is a rough average, not a precise recommendation.

Yes. You lose water through sweat during exercise. Light activity adds roughly 350 ml to your baseline; intense daily training may add 1,000 ml or more. Drink water before, during, and after workouts — do not wait until you feel thirsty.

Yes. Heat and humidity accelerate sweat loss even without exercise. In a hot climate, add 350 ml; in very hot or desert conditions, add up to 700 ml on top of your baseline. Monitor urine colour — pale yellow means good hydration.

Yes. Moderate consumption of caffeinated drinks (up to 3–4 cups/day) has a minimal net diuretic effect, and their water content contributes to hydration. Plain water remains the best source, but herbal teas, milk, and water-rich foods (cucumbers, watermelon) all count.

Dark yellow or amber urine is the most reliable early sign. Other symptoms include dry mouth, headache, fatigue, difficulty concentrating, and reduced urine output. Severe dehydration causes dizziness, rapid heart rate, and confusion — seek medical help immediately.