Water Intake Calculator
Daily water needs for your weight, exercise and climate.
Your result
About 20% of fluid comes from food. Urine that is pale yellow is a practical sign of good hydration.
Medical disclaimer: This tool is for education and is not medical advice. Read more.
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How Much Water Should You Drink?
The "eight glasses" rule is a guide, not a law.
Nutrition & DietHidden Calories in Drinks
Liquid calories add up quickly and do not fill you up.
Sleep & Mental WellbeingScreen Time and Mental Health in Adults
Quality and context matter more than raw hours.
Frequently asked questions
What does the Water Intake Calculator do?
Daily water needs for your weight, exercise and climate. Enter your values and the result and chart update instantly.
How accurate is it?
It uses published, widely used formulas. Results are estimates for education and planning, not a diagnosis. Talk to a qualified clinician about decisions affecting your health.
Is my information stored or shared?
No. All calculations run in your browser and nothing you type is sent to a server or saved.
What can I search to find this tool?
People find it by searching for: how much water should i drink; am i drinking enough water; hydration for exercise.