Water Intake Calculator
Get a daily water target based on your weight.
About the Water Intake Calculator
The Water Intake Calculator suggests a daily water target based on your body weight and how much you exercise. It is a general guideline to aim for, not a strict rule, since needs rise in hot weather, during illness, and with activity.
Frequently asked questions
Largely yes — the fluid in most drinks and even in food counts toward hydration, despite the old idea that caffeine dehydrates you. Plain water is still the simplest way to top up.
Pale yellow urine and rarely feeling thirsty are good everyday signs. Thirst, dark urine and headaches suggest you need more, especially in heat or after exercise.