HEALTH / HYDRATION
Water Intake Calculator
Build a simple daily hydration planning target from body weight, exercise time, and the climate adjustment you choose.
Set hydration inputs
Enter exercise for the day and an optional climate add-on in litres.
Daily hydration estimate
Your hydration estimate will appear here
Enter weight, exercise, and climate assumptions, then calculate.
How this hydration estimate works
The script starts with 0.033 litres per kilogram, adds 0.35 litres for each 30 minutes of exercise, and adds the climate value you enter. It converts the result to approximate cups and fluid ounces.
Why inputs matter
Exercise and hot or dry conditions can increase fluid loss, while food also contributes to total water intake. The result is not a requirement.
Know the limits
Do not use this heuristic to manage illness, fluid restrictions, kidney or heart conditions, pregnancy, heat stress, or endurance events without qualified guidance.
Frequently Asked Questions
What does this water intake calculator estimate?
It estimates a daily hydration planning target from body weight, exercise minutes, and a climate adjustment entered by the user.
What formula does it use?
The model starts with 0.033 litres per kilogram of body weight, adds 0.35 litres per 30 minutes of exercise, and adds the climate value entered in litres.
Is this an official daily water requirement?
No. It is a simple planning heuristic. Fluid needs vary with food, weather, exercise, health, medications, and other factors.
Can I use the result during exercise or illness?
Use caution and follow qualified medical or sports-hydration guidance when illness, heat stress, endurance exercise, pregnancy, kidney disease, heart disease, or fluid restrictions are involved.
What units are shown?
The main result is shown in litres per day, with approximate cups and fluid ounces for comparison.