Your details
Your inputs stay in this browser. Results are planning estimates, not medical advice or a substitute for individual clinical guidance.
How to use the water intake calculator
Use the range as general planning guidance, not a prescription.
Enter weight
Enter body weight and select kilograms or pounds.
Add exercise
Enter daily exercise minutes and any clinician-directed adjustment.
Review the range
Use the broad fluid range while remembering that food and other drinks contribute.
Frequently Asked Questions
How does the water intake calculator estimate a daily range?
It starts with a broad weight-based planning range of 30–35 mL per kilogram of body weight, then adds an exercise allowance and any optional adjustment you enter.
Does the estimate include water from food and other drinks?
Yes. The result is a broad total-fluid planning estimate, so water-rich foods and other non-alcoholic drinks can contribute to your daily intake.
Why does exercise increase the suggested fluid range?
Exercise can increase fluid losses through sweating. This calculator adds a broad 400–800 mL range per exercise hour; your needs can vary with intensity, conditions and individual factors.
Should everyone drink exactly the calculated amount?
No. This is general planning guidance, not a prescription. Fluid needs can differ because of health conditions, medicines, pregnancy, breastfeeding and clinician advice.
Can I use this calculator for medical hydration advice?
No. If you have been given fluid restrictions or have symptoms of dehydration or illness, follow advice from an appropriate healthcare professional.