In ounces
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Water Intake Calculator
Calculate how much water you should drink each day based on your body weight and activity level. Staying hydrated is one of the simplest things you can do for your health.
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Recommended daily water intake
Glasses (250ml each)
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How daily water needs are estimated
Base: 30-35 ml/kg body weight. Adjust +500 ml/hour exercise, +200-500 ml hot/dry climate, +500-700 ml pregnancy/breastfeeding. ~20% from food. Trust thirst and urine concentration alongside the estimate.
Frequently asked questions
How accurate are the results?
Formulas used here are validated in population studies but cannot account for individual genetics, body composition, or medical conditions. Treat results as a starting point, not a medical diagnosis.
Should I consult a professional?
If you have specific health concerns, existing conditions, or are planning significant lifestyle changes, consult a qualified healthcare provider (doctor, dietitian, physiologist).
How often should I recalculate?
Recalculate when your weight changes more than 5%, activity level shifts significantly, or every 3-6 months for routine monitoring. Results are snapshots — your body changes daily.
Last updated
For general wellness information only, not medical advice — see our disclaimer.