Water Intake Calculator
Calculate your recommended daily water intake.
About this tool
This estimates a daily water intake target using a common baseline of ~35 ml per kilogram of body weight, then adds extra for exercise (which increases fluid loss through sweat) and hot or humid climates.
Key Features
- Baseline from body weight
- Extra allowance for exercise minutes
- Climate adjustment for hot/humid conditions
How to Use
- Enter your weight in kilograms.
- Enter your daily exercise minutes.
- Choose your climate.
- Click Calculate Water Intake.
Benefits
- Get a personalized hydration target instead of a generic '8 glasses a day'
- Adjust for exercise and climate
- Simple daily reference point
Frequently Asked Questions
No — that's a rough average that ignores body size, activity and climate, all of which meaningfully change how much water you need. A weight-based estimate is a better personalized starting point.
This is a target for total fluid intake from all sources — food typically provides some water too, so treat this as an upper-bound guide rather than a number you must drink in plain water alone.