Calculate your personalized hydration target in liters, ounces, and glasses. Factor in workout sweat loss, climate conditions, and lifestyle.
The conventional advice to drink eight 8-ounce glasses of water per day (roughly 2 liters) was originally popularized without substantial clinical backing. In reality, human fluid balance is highly dynamic and depends on lean body mass, metabolic rate, sweat volume, atmospheric humidity, and sodium intake.
The baseline physiological formula dictates 35 ml per kilogram of body weight. An active 80 kg individual requires approximately 2,800 ml at rest. When engaging in moderate cardiovascular exercise, sweat rates range from 0.5 to 1.5 liters per hour, requiring immediate fluid and electrolyte replenishment.
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