Water Intake Calculator
Estimate your daily water needs, adjusted for exercise, hot weather and pregnancy.
Runs in your browser. Nothing is uploaded Free, no sign-up Works on mobile
kg
minutes
Weather
Daily water intake
3.1 litres
about 13 glasses of 250 ml
Per waking hour (16 h)
195 ml
1-litre bottles
3.1
About 20% of daily water comes from food. Drink more during fever, diarrhoea or heavy sweating. People with kidney or heart conditions should follow their doctor’s advice.
How to use Water Intake Calculator
- Enter your body weight.
- Enter your daily exercise and choose the weather.
- Read your daily target in litres and glasses.
Frequently asked questions
How much water should I drink a day?
A common guide is about 35 ml per kg of body weight, plus extra for exercise and hot weather. A 65 kg adult needs roughly 2.3–3 litres a day.
Do tea and food count?
Yes. About a fifth of daily water comes from food, and drinks such as tea, milk and buttermilk also count.
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