Water Intake Calculator
A starting-point daily hydration target based on body weight. Individual needs vary with activity, climate, diet, and health.
Suggested daily water
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How this works
This uses a widely cited rule of thumb of roughly 35 ml per kg of body weight per day (about 0.5 oz per pound), scaled slightly by activity. It is a general guideline, not a medical requirement.
You also get water from food and other drinks. Thirst and urine color are practical signals: pale yellow usually indicates adequate hydration.
Medical disclaimer: Hydration needs vary significantly. Certain health conditions require fluid restriction — follow your clinician's advice over any general estimate.