How does the Water Intake Calculator work?

Base intake = body weight (kg) × 35 ml Then: Sedentary adjustment: ×1.0, Moderate: ×1.15, Active: ×1.35 Then: Add 500ml per 30 minutes of intense exercise Then: ~20% of daily water comes from food.

Can you give an example of how to use the Water Intake Calculator?

Example: Input 70kg person, moderate activity gives a result of ~2.8 litres/day (11.2 glasses).

Is the Water Intake Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Water Intake Calculator?

Our Water Intake Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Water Intake Calculator

Body Weight

Unit

Activity Level

A water intake calculator estimates your daily hydration needs based on body weight and activity level. The general guideline is 35ml per kg of body weight, adjusted upward for exercise and heat.

Symbol	Name	Unit	Description
kg	Body weight	kg	Current body weight in kilogrammes
L	Water per day	L	Recommended daily water intake
lbs	Body weight	lbs	Current body weight in pounds

Weight (kg)	Sedentary	Moderate	Active
50 kg	1.75L	2.01L	2.36L
60 kg	2.10L	2.42L	2.84L
70 kg	2.45L	2.82L	3.31L
80 kg	2.80L	3.22L	3.78L
90 kg	3.15L	3.62L	4.25L
100 kg	3.50L	4.03L	4.73L

References

›Hydration guidelines — European Food Safety Authority

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