Free calculator
Water intake calculator: how much water should I drink a day?
Water by body weight
| Weight | Water a day | Glasses (250 ml) |
|---|---|---|
| 50 kg | 1.65 L | 7 |
| 60 kg | 2.0 L | 8 |
| 70 kg | 2.3 L | 9 |
| 80 kg | 2.65 L | 11 |
| 90 kg | 2.95 L | 12 |
| 100 kg | 3.3 L | 13 |
What counts
EFSA puts adequate total water intake at about 2.0 L a day for women and 2.5 L for men, counting every drink and the water in food. Tea, coffee, milk and soups all count; water-rich food like fruit and vegetables adds more. Thirst, the weather and how much you move are good guides on top of any number.
Doy fills up as you drink
In Doydum, Doy’s body is your water meter: each glass you log raises the water inside him, and the home-screen widget adds a glass with one tap. Gentle water reminders are scheduled on your phone.
Frequently asked questions
Is 2 litres of water a day enough?
For many adults it is in the right range. By the 33 ml per kg rule, 2 L fits someone around 60 kg; heavier or more active people need more, and hot days raise everyone’s need.
Does coffee or tea count towards my water?
Mostly, yes. Regular amounts of tea and coffee add to your fluid for the day. Water stays the simplest choice.
Can I drink too much water?
It is possible but rare in everyday life. Spread drinks through the day and follow your thirst; if you have a heart or kidney condition, ask your doctor what is right for you.