What this tool does
The calculator estimates daily drinking water intake from weight, activity level, and climate. It outputs a total daily target and a simple hourly pace across 16 waking hours.
Model used
This page uses a simplified baseline:
- Base intake = weight (kg) multiplied by 30 ml
- If you enter pounds, the calculator converts pounds to kilograms internally
Adjustments
The calculator applies fixed additions based on your selections:
- Activity: moderate adds 500 ml, active adds 800 ml, sedentary adds 0 ml
- Climate: hot adds 400 ml, dry adds 300 ml, temperate adds 0 ml
These are planning numbers. Real needs vary with sweat rate, diet, altitude, and health conditions.
Practical tips
- Spread intake across the day instead of drinking large amounts at once.
- Increase fluids when you sweat more than usual or during hot weather.
- Use the scenario compare table to test different activity and climate settings.
- If you have medical conditions that affect fluid balance, follow professional advice.
References
Wikipedia: Daily consumption of drinking water | General hydration references
Image credits
- Photo from Pexels, used under the Pexels license.
