REFERENCE // TOOL
Daily Water Need
Drink to the work and the heat, not to thirst. This sizes your hourly intake and your carry.
Estimate how much water to drink per hour and carry, by work load and heat. Figures follow US Army TB MED 507 and CDC/NIOSH.
Drink per hour
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Total for the work
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In liters
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How it works
Drink to the work and the heat, not to thirst — thirst means you are already behind. Replacement runs from about ½ quart per hour for light work up to 1 quart per hour for hard work in extreme heat. Never exceed 1.5 quarts per hour or 12 quarts per day; overdrinking can wash the salt from your blood and cause a medical emergency.
Source: US Army TB MED 507 · CDC / NIOSH — Hydration.