Health
Daily Water Intake Calculator
Use a simple weight-based formula to estimate your daily water intake needs.
Calculator
Results
- Recommended intake2.38 L/day
- Equivalent cups10.0 cups/day
General hydration guideline only; adjust for heat, exercise, and medical advice.
Formula
Estimated water intake (L/day) = weight (kg) × 0.033
Use this formula with the live inputs above to test scenarios instantly.
Assumptions
- Baseline estimate only; needs vary with climate, activity, and medical conditions.
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How this formula works
This hydration estimate uses a practical weight-based heuristic to generate a daily baseline target. It is intentionally simple so users can quickly establish a starting point and adjust for real-world factors.
Actual fluid needs vary with climate, sweat loss, activity, medication, and health conditions. Use this output as a planning anchor, then personalize based on your routine and professional guidance if needed.
References & citation
Use these references when documenting assumptions, and copy the block below when citing this calculator.
- About Adult BMI
Centers for Disease Control and Prevention (CDC)
Clinical context for BMI interpretation ranges.
- Dietary Reference Intakes for Water
National Academies of Sciences, Engineering, and Medicine
Commonly cited reference for hydration baseline guidance.