Health · Daily hydration

Water intake calculator

Enter your weight, activity level and climate to get your recommended daily water intake.

Your details

Daily water intake
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Recommended fluid intake per day
Ounces—
Cups (240 ml)—

Rough sheet

step-by-step
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How the recommendation is calculated

This calculator estimates a daily water intake target from your body weight as a starting baseline, then adjusts upward for higher activity levels and hotter climates, both of which increase fluid loss through sweat. It's a general guideline rather than a personalized medical recommendation — actual needs vary with individual health conditions, diet, and climate beyond what a simple calculator can account for.

Frequently asked questions

A common baseline is about 33 ml per kilogram of body weight per day, adjusted upward for exercise and hot climates. Individual needs vary based on health, diet, and environment.

Yes. Physical activity increases fluid loss through sweat, so more active people generally need more water than the sedentary baseline suggests.