How much water do you need?
Fluid needs vary with climate, activity, body size, diet, pregnancy and health. This estimator offers a simple planning starting point, not a universal target or medical instruction.
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Hot weather and exercise can increase fluid losses. Food also contributes water. People with conditions requiring fluid restriction, or those taking relevant medicines, should follow their clinician’s advice rather than a general calculator.
Related tools and guides
Explore more practical tools and explainers across Publication Today. Use all estimates as general information and verify important decisions with qualified sources.