Water Intake Calculator
Daily hydration target based on your body weight and activity.
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Your Results
Daily target109 oz
In liters3.2 L
In cups (8 oz)14 cups
Estimate only. Climate, sweat rate, and health conditions change the need.
Frequently Asked Questions
Is the 8 glasses a day rule accurate?
Not really — needs scale with body weight and activity. A 180 lb active person needs roughly 100+ oz, while a smaller sedentary person needs less.
Does coffee count?
Mostly yes. Caffeinated drinks count toward hydration, though water is still the best choice for most of your intake.
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