🧮 Free Calculator
Water Intake Calculator
A practical starting range from weight (35 ml/kg baseline), bumped for activity, heat, pregnancy or breastfeeding, and optional extras — not a medical prescription.
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Inputs
Results
0 L
≈ 0 cups (250 ml each)
Rough daytime split (example)
Hydration context
Thirst, urine colour, and activity matter. “8 glasses” is not universal — needs scale with size, sweat, and environment. In India, safe drinking water (boiling, RO maintenance, storage hygiene) matters as much as volume.