Proper hydration is essential for health. Calculate your recommended daily water intake based on your body weight to stay energized and support bodily functions.
Proper hydration is crucial for overall health. Water regulates body temperature, lubricates joints, aids in digestion and nutrient absorption, and improves brain function. Calculating your daily water intake helps ensure your body has the resources it needs to perform at its best.
While individual needs vary, a common recommendation is based on body weight:
Daily Water Intake (ml) = 30–35 ml × Your Body Weight in kg
Example: A 70 kg person would need approximately 70 × 35 = 2450 ml (or 2.45 liters) of water per day.
Note: You should adjust your intake based on factors like exercise, climate, and pregnancy. This calculator provides a baseline recommendation.
Reference: National Academies of Sciences, Engineering, and Medicine (IOM).
Maintained by Live Fitness Check. Last updated: August 9, 2026. How we test our calculators .
Estimates a daily water-intake target from body weight.
The calculator applies the weight-based hydration factor configured in the live tool and converts the result into an easy daily target. The calculation uses body weight.
Fluid requirements vary with climate, activity, diet, pregnancy, illness, medications and heart or kidney conditions. Use the number as an estimate and consider professional advice when the result may affect health, treatment, pregnancy, nutrition, exercise safety or another important decision.
