How many litres of water does an adult need per day from all sources?
Food medium Data from 2023
Guess before you scroll — the answer is below
The answer
3 litres
Roughly 2.7.
EFSA puts adequate daily water intake at about 2.0 litres for women and 2.5 for men, averaging around 2.7 across sources — and roughly 20-30% of it comes from food, not drinks. The famous "eight glasses" rule has no scientific origin anyone can find.
Where this number comes from
| Source | European Food Safety Authority dietary reference values |
|---|---|
| Figure refers to | 2023 |
| Last checked | |
| Unit | litres |
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