Hydration Calculator
Estimate daily water intake from body weight using a simple general hydration guideline.
A common general guideline is about 30–40 ml per kg. This tool defaults to 35 ml per kg.
Privacy: runs locally in your browser. No values are stored or transmitted.
How it works
This calculator estimates daily water intake as: body weight × hydration guideline.
The default guideline used is 35 ml per kg, which is a common general rule-of-thumb, not a medical prescription.
Examples
- 70 kg × 35 ml/kg → 2,450 ml/day → about 2.45 liters/day
- 154 lb is converted to kg internally before calculation
- Useful for simple daily hydration planning
FAQ
- What does this calculator estimate?
It estimates daily water intake from body weight using a simple general hydration guideline.
- What formula does it use?
This calculator uses a common rule-of-thumb of about 35 ml of water per kilogram of body weight.
- Is the result exact?
No. Hydration needs vary with climate, exercise, diet, health status, and medication use.
- Can I use pounds instead of kilograms?
Yes. The calculator supports both metric and imperial units.
- Are my values stored?
No. All calculations run locally in your browser and are not stored or transmitted.