Question 1

How much water should I drink per day?

Accepted Answer

Most adults need about 2.7-3.7 liters of total water per day (from drinks and food). A simple rule is 30-35 ml per kg of body weight. Athletes, pregnant or breastfeeding women, and people in hot climates need more. This calculator gives a personalized estimate.

Question 2

Does coffee and tea count?

Accepted Answer

Yes, mostly. While caffeine is a mild diuretic, studies show the water in coffee and tea still contributes to hydration. Water-rich foods like fruit and soup also count.

Question 3

Should I drink 8 glasses a day?

Accepted Answer

The '8 glasses' rule is a rough guideline. Your actual need depends on body weight, activity, climate and health. A 60 kg person needs less than a 90 kg person. This calculator personalizes the target.

Question 4

Is drinking too much water dangerous?

Accepted Answer

Yes — overhydration (hyponatremia) is rare but real. Avoid drinking more than 1 liter per hour. If you exercise intensely for hours or have kidney/heart issues, consult a doctor about your hydration needs.