Water Intake Calculator

This calculator estimates how much water you should drink a day based on your weight, activity level, and environment factors.

Assigned sex

Weight

kilograms (kg)

Activity level

Exercise is at least 15-30 minutes of elevated heart rate activity.

Environment (optional)

You need more water in hot, humid, dry, or high-altitude conditions.

Daily water intake should often fall between 2.5 and 4 liters for many adults, but individual needs vary based on physical activity and climate conditions.

This calculator is only an estimate and should not be used as a sole medical reference. People with kidney, heart, or fluid-balance conditions should follow medical clinician advice.