Health & Fitness
Water Intake Calculator
Get a simple hydration estimate based on weight and exercise time.
Inputs
Results
Result
Enter values to calculate.
Your result explanation will appear here.
Useful next checks
- Treat the result as general guidance, not a diagnosis.
- Check unusual results with a qualified health professional.
- Retest with accurate measurements for a better estimate.
Intro
Use this water intake calculator to estimate daily fluid needs from weight and exercise.
How it works
Enter body weight and exercise minutes. The calculator uses a simple baseline per kilogram and adds fluid for activity.
Formula
The starter estimate uses 0.033 litres per kg plus an exercise adjustment.
Example calculation
A 70 kg person with 30 minutes of exercise gets a higher estimate than the baseline alone.
FAQs
- Climate, diet, sweat rate, and health conditions can change needs.
- Food and many drinks contribute to hydration.
Related calculators
Frequently asked questions
Is this medical advice?
No. Hydration needs vary and medical conditions can change fluid requirements.
Does food count toward hydration?
Yes. Many foods and non-alcoholic drinks contribute to daily fluid intake.