Daily Water Intake Calculator
Estimate your daily water intake target in ounces and liters, adjusted for body weight, activity, and climate.
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Total moderate-to-vigorous minutes per day
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Enter your details on the left, then press Calculate.
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Frequently asked questions
Is the '8 glasses a day' rule based on science?
The eight-glasses guideline is a rule of thumb, not a strict recommendation. Actual fluid needs depend on body size, activity, climate, and what you eat. Many foods (fruits, vegetables, soups) also contribute to daily water intake.
Can I drink too much water?
Yes. Over-hydration can dilute blood sodium and cause hyponatremia, which is rare but serious. Endurance athletes and people on certain medications should be especially careful — drink to thirst, not on a fixed schedule.
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