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Online Water Intake Calculator

Estimate how much water you should drink each day from your body weight and activity level. Results are shown in liters, milliliters and cups as a simple daily target.

Units

Activity

Result:

General guideline only — adjust for climate, health and thirst. Not medical advice.

Tool Features

Estimate daily water from weight and activity
Show liters, milliliters and cups
Switch metric and imperial units
Responsive design for mobile and desktop
No registration or software installation

Common Usage

Set a daily hydration goal
Adjust water for workout intensity
Pair with calorie and protein plans
Build a simple wellness routine