How to use Daily Water Intake Calculator
- Enter your weight.
- Enter your daily exercise time and whether the weather is hot.
- Read the suggested amount in liters, ounces and cups.
About this tool
A simple guideline is about 33 ml of water per kilogram of body weight, plus around 350 ml for every 30 minutes of exercise and extra in hot weather. Food provides roughly 20% of fluid intake, and tea, coffee and other drinks also count.
Needs vary with health, pregnancy, altitude and medication. This calculator gives general estimates from standard formulas and is not medical advice. Talk to a doctor or dietitian about your own health.
Frequently Asked Questions
- Is 8 glasses a day a rule?
- It is a convenient rule of thumb, not a scientific requirement. Your needs depend on body size, activity and climate.
- How can I tell if I am drinking enough?
- Pale yellow urine and rarely feeling thirsty are common signs of adequate hydration.
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