Daily Water Intake Calculator
Get a general hydration estimate based on body weight and activity inputs.
Water Intake Calculator
Quick estimates using your height, weight, age, activity, or daily exercise.
These results are general estimates, not medical advice. Individual needs can vary. Consult a qualified healthcare professional before making health decisions.
How this tool works
Daily fluid needs vary widely. This calculator provides a general educational estimate and cannot account for every climate, health or dietary factor.
Important limitations
- Hot weather, altitude, exercise and illness may change fluid needs.
- Kidney, heart and other medical conditions may require individualized fluid advice.
- Food and other beverages may contribute to total daily fluid intake.
Frequently asked questions
Does everyone need the same amount of water?
No. Body size, activity, climate, diet, pregnancy, breastfeeding, medication and health conditions can change fluid needs.
Can drinking too much water be harmful?
Yes. Excessive intake can be dangerous. Do not force fluid beyond comfort or ignore medical fluid restrictions.
Medical disclaimer: FitCalc provides general informational and wellness estimates only. It is not a medical device and does not provide medical advice, diagnosis or treatment. Consult a qualified healthcare professional before changing diet, fluid intake, exercise or treatment. Stop if you feel unwell and contact local emergency services in an emergency.
Explore the complete FitCalc health calculator and wellness toolkit or use the adult BMI calculator.