Water Intake Calculator
This Water Intake Calculator estimates how much water you should drink each day based on your body weight and daily activity level.
Water Intake Calculator
How Daily Water Intake Is Calculated
Daily water needs vary depending on age, gender, body size, and activity level. Children require more water per kilogram of body weight than adults.
Base formula:
Water (ml/day) = Body Weight (kg) × Age-based factor
- Age 1–3: 100 ml/kg
- Age 4–8: 75 ml/kg
- Age 9–13: 50 ml/kg
- Age 14+: 35 ml/kg (male), 30 ml/kg (female)
Activity adjustment:
- Low: +0%
- Moderate: +10%
- High: +20%
US units:
- 1 cup = 240 ml
- 1 fl oz = 29.57 ml
Medical disclaimer: This calculator provides an educational estimate only. Individual needs may vary.
