Staying hydrated is essential for your body to function at its best. Our free Water Intake Calculator helps you estimate how much water you should drink each day based on your weight, activity level, and climate. Quickly discover your optimal hydration goal and maintain a healthier lifestyle!
Find out how much water you should drink every day based on your weight, activity level, and climate.
The calculator uses a simple formula that takes into account your body weight and lifestyle factors.
On average, you should drink 35–40 ml of water per kilogram of body weight — but this value changes depending on temperature and physical activity.
Formula:
Daily Water Intake (liters) = Weight (kg) × Water factor (ml/kg) ÷ 1000
Water factor examples:
Sedentary: 30 ml/kg
Moderate activity: 35 ml/kg
Active lifestyle or hot climate: 40 ml/kg
Example:
If you weigh 70 kg and have moderate activity:
→ 70 × 35 = 2450 ml ≈ 2.45 liters per day
Keep a reusable bottle nearby throughout the day.
Drink before you feel thirsty.
Eat fruits and vegetables rich in water (like watermelon, cucumber, and oranges).
Increase your intake when exercising or in hot weather.
Yes, but water is always best. Caffeinated drinks can have a mild diuretic effect, so balance them with extra water.
Yes. Overhydration is rare but can occur. Don’t exceed 4–5 liters per day unless recommended by a doctor.
This calculator is for general reference. Children, elderly individuals, and people with medical conditions should follow medical advice.
