ESTIMATED DAILY FLUID INTAKE
0 L
Enter your details to calculate.
This calculator gives a general hydration estimate only. Individual hydration needs can vary significantly.
How to calculate water intake
Daily water intake estimates are usually based on body weight, activity level and environmental conditions. Physical activity and warmer climates can increase fluid needs.
This calculator gives a simple estimate of daily hydration requirements based on general guidance.
Example: 70kg adult
A person weighing 70kg may require around 2.1 to 2.8 litres of water per day depending on activity level, climate and other factors.
What this calculator is for
This water intake calculator helps estimate general daily hydration needs. It may be useful for fitness awareness, exercise planning, hot weather awareness or understanding general fluid intake guidance.
Actual hydration needs vary depending on age, diet, activity, sweating, medication, illness, pregnancy, breastfeeding and medical conditions.
Why hydration matters
Water is important for temperature regulation, circulation, digestion and normal body function. Hydration needs may increase during exercise, hot weather or illness.
Both dehydration and excessive water intake can affect health.
Important note
This calculator is for general informational purposes only and should not replace professional medical advice. Always consult a qualified healthcare professional before making significant changes to your diet, exercise routine, hydration, weight management or lifestyle, especially if you have a medical condition, take medication, are pregnant, or have specific health concerns.
Frequently Asked Questions
How much water should I drink per day?
Daily water needs vary depending on body size, activity level, climate and individual health factors.
Does exercise affect hydration needs?
Yes. Physical activity can increase sweating and fluid loss, which may increase hydration needs.
Does hot weather increase water requirements?
Yes. Hot climates and warm weather may increase fluid loss through sweating.
Can hydration needs vary between people?
Yes. Hydration requirements can vary significantly depending on health, medication, diet, activity and environmental conditions.
Should I speak to a healthcare professional?
Yes, especially before making significant changes to hydration, diet, exercise or lifestyle, or if you have a medical condition, take medication, are pregnant, or have specific health concerns.