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.
Related calculators
Health
Calorie (TDEE) Calculator
Total Daily Energy Expenditure — daily calories needed to maintain, lose, or gain weight.
Health
BMI Calculator
Body Mass Index for adults, with WHO category interpretation.
Health
BMR Calculator
Basal Metabolic Rate via Mifflin-St Jeor — calories your body burns at rest.
Health
Body Fat Calculator
US Navy method — body fat percentage from tape measurements.