Share Daily Water Intake Calculator Daily Water Intake Calculator Weight (in kg): Activity Level: Sedentary (little to no exercise) Lightly Active (light exercise/sports 1-3 days/week) Moderately Active (moderate exercise/sports 3-5 days/week) Very Active (hard exercise/sports 6-7 days a week) Extra Active (very hard exercise/sports and physical job) Calculate How to Use Daily Water Intake Calculator Enter the weight in kilograms. Select the activity level from the dropdown. Click on the “Calculate” button to see the recommended daily water intake displayed below the button.