Water Intake Calculator

Estimate your daily water intake based on body weight, activity, and weather. Hydration needs vary by diet, health, climate, and exercise, so use this result as a practical starting point.

Body Weight (kg) Activity Weather

Enter your details to estimate daily water intake.

How Much Water Do You Need?

A simple starting estimate is 30-35 ml of water per kg of body weight per day. Exercise and hot weather can increase fluid needs. Foods, tea, milk, and other drinks may also contribute to daily fluid intake.

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Responsible use: Calculator Work provides estimates and educational information. Please verify important financial, health, tax, legal, or construction decisions with a qualified professional.