Jenee

Water Intake Calculator

Find out exactly how much water you should drink daily based on your body weight, age, and activity level.

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Calculation Method

Basic Formula: Body Weight (kg) × 35mL

Example: For 60kg body weight = 60kg × 35mL = 2,100mL (about 2.1L)

This is a general guideline and may need adjustment based on individual activity and environment.

Water Intake Guidelines

• Basic intake: Body weight × 35mL

• During exercise: Additional 500-1000mL

• Hot weather: Additional 500-1000mL

• During fever: Additional 500-1500mL

※Adjust according to environment and physical condition

How to Use

  1. STEP 1
    Enter your body weight (kg) and press 'Calculate Water Intake' button for automatic calculation.
  2. STEP 2
    Results show daily recommended water intake (in mL and L) and the calculation formula.
  3. STEP 3
    Use as reference for health management, heat stroke prevention, and dehydration prevention.
  • This calculation result is a general guideline and actual needs vary based on individual activity, environment, and health condition.
  • Additional hydration is needed during exercise, hot weather, fever, etc.
  • Those with kidney or heart disease requiring fluid restriction should follow medical advice.
  • Avoid drinking large amounts at once; frequent small sips throughout the day are important.
  • This tool is for health management reference and does not replace medical diagnosis.

Tips

1

Why body weight × 35mL? 35mL per kg of body weight is a medically recommended general guideline for adult basic water requirements.

2

How does water intake vary by age? Infants need more water per kg of body weight than adults. Elderly people may have reduced thirst sensation, so careful monitoring is important.

3

What are the signs of dehydration? Common signs include dry mouth, dark urine, fatigue, dizziness, and decreased urine output. Severe cases can lead to serious health issues.

4

How much water should I drink during exercise? During moderate exercise, add about 500-1000mL depending on duration and intensity. For long or intense sessions, include electrolyte drinks to replace salts lost by sweating.

5

Is there a difference between drinking water and other beverages? While tea and coffee count as water intake, caffeine has diuretic effects. Water and barley tea are generally more effective for hydration.

FAQ

  • Q1

    When should I drink water?

    Effective timing includes upon waking, before meals, before/after exercise, before/after bathing, and before sleep.

  • Q2

    Do tea and coffee count as water intake?

    Generally yes, but caffeine has diuretic effects, so water and barley tea are more effective.

  • Q3

    Is too much water dangerous?

    Yes. Rapid consumption of large amounts can lead to water intoxication (hyponatremia). It's best to sip small amounts (about 200ml) regularly rather than drinking a lot at once.

  • Q4

    What about the elderly or children?

    Elderly people tend to feel thirst less easily, and children have higher water requirements per kg of body weight. It's important for those around them to encourage regular hydration.

  • Q5

    How should I drink water for beauty and skin health?

    Drinking 1.5–2L of room-temperature water sip-by-sip throughout the day can improve blood flow and help maintain healthy skin turnover.

This information is general guidance. Consult doctors, nutritionists, or medical institutions for detailed advice.
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