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This calculator gives a general estimate for adults and is not medical advice. Talk to a doctor or a registered dietitian before making health decisions.
How is it calculated?
The estimate uses about 33 ml per kilogram of body weight, plus 350 ml for every 30 minutes of exercise and 0.5 L in hot weather. Food provides roughly a fifth of daily water, and all drinks count.
Thirst and pale-yellow urine are good everyday guides. People with heart or kidney conditions should follow their doctor's advice.
Common questions
Is 8 glasses a day right?
It is a reasonable rule of thumb; needs vary with body size, activity and climate.
Do coffee and tea count?
Yes. Moderate amounts of coffee and tea add to your daily fluids.