What is the Water Intake Calculator?
How much water you need depends on body size, activity, weather and life stage. This calculator gives a personal daily estimate in litres and 250 ml glasses.
How to use it
- 1
Enter your weight
And daily exercise.
- 2
Pick the weather
Hot or humid adds more.
- 3
See your target
In litres and glasses.
Features
Your weight
About 35 ml per kg.
Exercise and heat
More for workouts and hot, humid weather.
Pregnancy and breastfeeding
Extra amounts included.
Popular uses
Daily habits
A simple target to aim for.
Summer
Drink enough in the heat.
Frequently asked questions
Does tea or coffee count?
Yes, all drinks count; water is the best choice.
Can I drink too much?
Yes — very large amounts in a short time are harmful. People with kidney or heart conditions should follow medical advice.