Water intake calculator
Estimate your daily water intake.
- Instant
- Free
- Private (processed locally)
- No sign-up
Why stay well hydrated?
Water makes up a large part of our body and is involved in almost all of its functions: temperature regulation, nutrient transport, waste removal. Drinking enough supports focus, energy and overall health.
How to use the calculator
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Enter your weight
The basis of the calculation.
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Specify your activity
Sedentary, moderate or intense.
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Add the climate
Temperate or hot, then read the result in liters and glasses.
Reference needs (sedentary adult, temperate climate)
| Weight | Estimated need |
|---|---|
| 50 kg | ~1.7 L |
| 60 kg | ~2.0 L |
| 70 kg | ~2.3 L |
| 80 kg | ~2.6 L |
| 90 kg | ~3.0 L |
Add about 0.5 to 0.7 L on workout days, and more in hot weather.
Tips to drink enough
- Keep a bottle within reach and sip regularly.
- Don’t wait for thirst: it already signals a slight deficit.
- Increase your intake during exercise and in hot weather.
An estimate for information only, not a substitute for advice from a health professional.
Frequently asked questions
How much water should I drink per day?
A common estimate is about 30 to 35 ml of water per kilo of body weight, roughly 2 to 2.5 L for a 70 kg adult. Needs rise with physical activity and heat.
What is the calculation based on?
The tool starts from a base of about 33 ml per kilo, then adds a supplement based on your activity level and a coefficient for hot climates.
Does water from food count?
Yes. Part of your hydration comes from food (fruit, vegetables, soups) and other drinks. The figure shown is the recommended total water intake.
Can you drink too much water?
It is rare but possible (hyponatremia) with extreme intake over a short time. Listen to your thirst and spread intake across the day.
Is this medical advice?
No. It is an estimate for information only. For specific needs (pregnancy, illness, intense sport), consult a health professional.