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Daily Water Intake Calculator
Calculate how much water you should drink per day based on weight, activity, and climate.
About This Calculator
The "8 glasses a day" rule is a myth — actual needs vary significantly by body weight, activity, and climate. The National Academies recommend 3.7L/day for men and 2.7L/day for women (from all sources). Urine should be pale yellow — darker indicates dehydration.