Water Intake Calculator
Find out how much water you should drink per day based on your body weight, activity level, and local climate.
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Frequently Asked Questions
How much water should I drink per day?
General guidance: approximately 35 ml per kg of body weight per day (about 2.5–3.5 liters for most adults). Needs increase with physical activity, hot weather, high-altitude environments, and illness.
Does coffee and tea count toward water intake?
Yes. Despite mild diuretic effects, caffeinated beverages like coffee and tea contribute to overall hydration. The fluid they provide outweighs the mild water loss from caffeine for moderate drinkers (1–3 cups/day).
What are signs of dehydration?
Early signs: dark urine, dry mouth, reduced urination, fatigue. Moderate: headache, dizziness, reduced concentration. Severe: rapid heartbeat, confusion, sunken eyes. Pale yellow urine generally indicates adequate hydration.