Fitness Tool
Water Intake Calculator workspace
Estimate daily water intake using body weight for a practical hydration target.
Daily water target
2,380 ml
Rule of thumb: 35 ml per kg.
In liters
2.38 L
Approximate daily intake.
Health notice
Method used: Daily water estimate = 35 ml × body weight (kg). This tool is a non-diagnostic estimate for educational use only and is not medical advice. Consult a qualified doctor or registered dietitian for accurate, personalized guidance.
Formula and method
Water Intake Calculator applies the formula Daily water = Weight (kg) × 35 ml to your entered values and returns an immediate result that matches this tool's use case.
Example calculation
These examples show realistic water intake calculator scenarios so you can validate inputs and interpret outputs with confidence.
Example 1
A person weighing 68 kg has an estimated daily water baseline of approximately 2,380 ml or 2.38 liters.
Example 2
Track how a change in weight shifts the estimated daily intake target.
Water Intake Calculator FAQ
Is the 35 ml per kg rule medically accurate?
It is a commonly recommended rule of thumb for general adults, but actual hydration needs vary by activity, climate, and health factors. Consult a healthcare provider for medical guidance.
Does this account for exercise or hot climate?
No. This estimate is a baseline reference only. Higher activity, heat, or specific health conditions typically require additional fluid intake.
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