Water Intake
Daily hydration target based on body weight.
Enter values
kg
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Step by step
The formula
water (L) ≈ weight(kg) × 0.033
A common guideline is about 33 ml of water per kilogram of body weight per day. It is a starting point, not a prescription: food contributes a surprising amount, and exercise, heat and altitude all raise the requirement. Thirst and pale urine remain the practical signals.
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Common questions this calculator answers — select one to load its values.
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Frequently asked questions
Does activity change my needs?+
Yes — add roughly 350–700 ml per hour of vigorous exercise, and more in hot weather.
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