Water Intake Calculator: How Much Water Should I Drink
Enter your sex and weight to see about how much water to drink each day, in litres and 250 ml glasses.
- Nothing you type is stored
- Free
- No signup
Water to drink per day
1.8L
- Glasses (250 ml)
- 7 glasses
- Total water incl. food
- 2.3 L
- EFSA reference (total)
- 2.5 L
An estimate for general information, not medical advice.
Drink more in heat or exercise. Pale yellow urine means you are drinking enough.
How to use
- Choose male or female.
- Enter your weight (and pregnancy or breastfeeding if it applies).
- Read litres and glasses per day.
Good to know
Total water ≈ 35 ml per kg body weight per day, a common rule of thumb (30–35 ml/kg). About 20% of it usually comes from food (dal, sabzi, fruit, curd), so drinks ≈ 80%. Glasses are 250 ml.
For comparison, EFSA (2010) sets adequate total water at 2.5 L a day for men and 2.0 L for women, plus 0.3 L in pregnancy and 0.7 L when breastfeeding. Tea, milk, buttermilk and soups count toward drinks.
Hot weather, sweating and exercise raise needs (see the hydration calculator). People with heart failure, kidney disease or a doctor-advised fluid limit must follow that limit instead. Pale yellow urine is a simple sign you are drinking enough.
Questions
How much water should I drink a day?
Roughly 2–2.5 L of drinks for most adults, more in heat or with exercise.
Is 8 glasses a day right?
It is a fair average (2 L), but larger people and those in hot places often need more.
Do tea and coffee count?
Yes. Moderate amounts hydrate you, though water is the best choice.
Can I drink too much water?
Very large amounts in a short time can be dangerous. Spread drinks through the day.
Is my data stored?
No. Everything is calculated on your device.