Daily hydration needs vary from person to person and depend on body size, activity level, climate, and overall health.

This calculator provides an estimate based on commonly used hydration guidelines, including:

• General daily fluid intake recommendations from health authorities

• Weight-based estimates (≈ 30–35 ml of water per kg of body weight)

• Additional fluids to account for physical activity

These figures are meant as a guideline, not a medical prescription. Listen to your body and adjust intake based on thirst, urine colour, and activity levels.