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Water Intake Calculator
How much water should you drink?
Daily hydration target by weight and activity level. Free, no signup.
Please note: This calculator gives a general estimate for information only. It is not medical advice and it does not replace a doctor, dietitian, or other health professional. Please talk to a qualified professional about your own health.
Frequently Asked Questions
A common rule of thumb is 30 to 40 milliliters per kilogram of body weight per day, higher for people with more physical activity.
No, this is an estimate for fluid intake specifically. Food typically provides some additional hydration on top of this.