Tool Desk
Hydration estimate
Water Intake Calculator
Build a starting fluid range, then adjust for heat, sweat, food, altitude, illness, and individual medical needs.
Interpret the estimate
How to use this result responsibly
The calculator combines a broad body-weight range with an exercise allowance. It estimates drinks, not total water from beverages and food, and it cannot know an individual sweat rate.
Worked example
A hot, humid outdoor session in Mumbai can require a different plan from an air-conditioned indoor walk. Use thirst, urine pattern, session duration, and individual medical advice as context.
Important limitations
- Sweat sodium and fluid losses vary widely between people and environments.
- Heart, kidney, and electrolyte conditions may require prescribed limits.
- Excess water can also be dangerous; more is not automatically safer.