What is a water intake calculator?
A water intake calculator estimates how much fluid you may need each day based on your body weight and activity level.
How daily water intake is calculated
This calculator uses 35ml per kilogram of body weight as the base amount, then adds extra water for moderate or high activity.
When to use this calculator
Use it when setting a daily hydration goal for training, general health tracking, or building a routine around meals and workouts.
Limitations
Hydration needs vary widely. This tool is not medical advice, and people with kidney, heart, or fluid-balance conditions should follow clinical guidance.