Water Intake Calculator
Estimates how much water to drink per day based on your body weight, exercise, and climate.
How this calculator works
Baseline of 35 ml/kg/day (common clinical heuristic), plus about 350 ml per 30 minutes of exercise (ACSM fluid guidance) and an allowance for hot climates. The National Academies (NASEM) adequate intake of 3.7 L (men) / 2.7 L (women) of total fluid is shown for reference.
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