Daily Water Intake Calculator
Calculate how much water you should drink per day based on your weight and exercise, in litres and glasses.
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How Much Water Should You Drink?
A widely used guideline is about 33 ml of water per kilogram of body weight per day — roughly 2.3 litres for a 70 kg adult — plus about 350 ml for every 30 minutes of exercise. The tool converts the total into litres and standard 200 ml glasses.
Needs rise with heat, altitude, pregnancy and illness, and part of your intake comes from food. This is general information, not medical advice — people with kidney or heart conditions should follow their doctor's guidance.
Frequently Asked Questions
Do tea and coffee count toward the total?
Mostly yes — despite the mild diuretic effect, caffeinated drinks still contribute net fluid. Water remains the best source since it adds no sugar or calories.
Can you drink too much water?
Yes. Drinking many litres in a short time can dilute blood sodium (hyponatremia), which is dangerous. Spread intake through the day and drink to thirst during exercise.
Is the "8 glasses a day" rule accurate?
It is a rough average. Needs scale with body weight and activity: 8 glasses of 200 ml (1.6 L) suits smaller people, while larger or active people need considerably more.
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Daily Water Intake Calculator