Health & Fitness
Water Intake Calculator
Get a simple hydration estimate based on weight and exercise time.
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Your result
Based on the values you enter
Water Intake result
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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.
Frequently asked questions
- Climate, diet, sweat rate, and health conditions can change needs.
- Food and many drinks contribute to hydration.
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.