Why is hydration so important?

Staying hydrated is essential for regulating body temperature, keeping joints lubricated, preventing infections, delivering nutrients to cells, and keeping organs functioning properly.

How is daily water needs calculated?

Your baseline need is roughly 35ml per kg of body weight. Extra water (about 350ml for every 30 minutes of exercise) is added to compensate for sweat loss, and hot/dry climates increase the goal further.

Can I drink too much water?

Yes. Drinking excessive water in a short time can cause hyponatremia, where blood sodium levels drop dangerously low. Healthy kidneys can process about 0.8 to 1.0 liters per hour. Endurance athletes are most at risk. Spread intake throughout the day rather than consuming large amounts at once.

Are the calculations on Water Intake Calculator | Daily Hydration Needs & Goals private?

Yes, completely. All calculations are performed entirely locally inside your browser using JavaScript. No inputs or personal metrics are ever transmitted to or stored on our servers.

Water Intake Calculator | Daily Hydration Needs

Water Intake Calculator – Hydration GuideMetriova provides free online calculators for finance, business, health, and construction. Calculate loans, investments, fitness metrics, and project materials in seconds.How Much Water Should I Drink?A 70 kg adult needs approximately 2.1 to 2.45 liters of water per day based on EFSA guidelines (30-35 ml per kg body weight). Adjustments: moderate exercise +400-600ml, hot climate +300-500ml, pregnancy +300ml, breastfeeding +700ml.

Body Weight

Minimum (30ml/kg)

Recommended (35ml/kg)

50 kg

1.50 L

1.75 L

60 kg

1.80 L

2.10 L

70 kg

2.10 L

2.45 L

80 kg

2.40 L

2.80 L

90 kg

2.70 L

3.15 L

100 kg

3.00 L

3.50 L