Health
Water Intake Calculator
Daily water target based on body weight and activity.
Inputs
Water Intake Calculator
Result
Daily water target
2.73 L
- Roughly
- 11.4 cups
Daily water needs
The old '8 glasses' rule is a floor, not a ceiling. Actual needs scale with body weight, activity, climate, and diet (fruits and vegetables count). A common estimate is ~30–35 ml per kg of body weight per day, more on training days.
Alongside energy math
Set calorie targets with the TDEE Calculator and monitor composition with the BMI Calculator — hydration status affects both scale weight and performance.