Free Health Calculator

Water Intake Calculator — Daily Hydration

Find out exactly how much water you should drink per day based on your weight, activity, and climate.

Calculate Water Needs ↓

Enter your details

Based on the standard 35 ml/kg formula adjusted for activity and climate.

litres per day
ml / day
glasses (250ml)
bottles (500ml)

How to stay hydrated

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Start your morning

Drink 400–500 ml of water first thing in the morning to replenish overnight losses.

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Around workouts

Drink 500 ml before exercise and 200–300 ml every 15–20 minutes during training.

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With meals

Drinking water with meals aids digestion and helps you feel fuller, naturally reducing calorie intake.

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Hot weather

In hot or humid conditions, increase your intake by 500–1000 ml per day above your baseline.

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