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Tool · Your water

Two liters of water a day? What you really drink

What you drink on a typical day, coffee and tea included. You see your total against the European reference, with the water from food. No advice, nothing is stored.

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The European reference differs by sex
Glasses of water5
One glass = 20 cl. Tap the last glass you drank.
Coffees and teas3
One cup = 20 cl
Other drinks1
Juice, milk, soda. One glass = 20 cl
1.8 Ldrunk per day
reference 2.0 L
water · 1.00 Lcoffee, tea · 0.6 Lother · 0.20 L
Nothing is sent or stored.
The method

Understanding your water needs

The tool adds up your drinks, coffee and tea included: a glass and a cup each count as 20 cl. It estimates the water from food at about 20% of total water, as EFSA does, then compares the total with the European reference.

Frequently asked questions

Do you really need to drink 2 liters of water a day?

The European reference is for total water, food included: 2 liters a day for women and 2.5 liters for men. With food providing about 20%, drinks account for around 1.6 and 2 liters.

Do coffee and tea count towards hydration?

Yes. In men drinking four cups of coffee a day, hydration markers did not differ from those with the same amount of water.

Is everyone's water need the same?

No. A study of more than 5,600 people from 23 countries shows that water turnover varies widely with age, body size, activity and climate.

Are my answers stored?

No. Everything is computed in your browser and nothing is sent to our servers. If you ask for it, your results can be kept on your device, in your summary, and deleted at any time.

Sources

  • Yamada et al., Science, 2022
  • EFSA, dietary reference values for water, 2010
  • Killer et al., PLoS One, 2014