Estimate daily hydration needs from body weight and activity level.
Estimate daily hydration needs from body weight and activity level.
Enter values above and click Calculate — results will appear here with the formula explained.
Popular rules say eight glasses, but hydration needs scale with body size, sweat losses and environment. A weight-based heuristic of about 33 ml per kilogram gives a personalized baseline, which exercise and hot climates push upward through sweat replacement.
All fluids count — coffee, tea, milk and the moisture in food contribute meaningfully. Rather than forcing liters, let thirst steer and use urine color as feedback; consistent pale yellow generally signals adequate hydration.
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Water Intake Calculator: Estimate daily hydration needs from body weight and activity level. Formula: baseline ≈ 33 ml per kg body weight. Example: A 72 kg person doing 45 minutes of daily exercise in a warm climate: baseline 2.
Popular rules say eight glasses, but hydration needs scale with body size, sweat losses and environment. A weight-based heuristic of about 33 ml per kilogram gives a personalized baseline, which exercise and hot climates push upward through sweat replacement.
All fluids count — coffee, tea, milk and the moisture in food contribute meaningfully. Rather than forcing liters, let thirst steer and use urine color as feedback; consistent pale yellow generally signals adequate hydration.
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A 72 kg person doing 45 minutes of daily exercise in a warm climate: baseline 2.4 L + 0.5 L exercise + 0.25 L climate ≈ 3.1 L total fluids.
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