Water Intake Calculator
Estimate how much water to drink each day for your body and activity.
Daily hydration target
Recommended water intake
2.81 litres
about 11 cups of 250 ml
For estimation purposes only — not financial, medical, or professional advice.
How to use this calculator
- 1Enter your body weight in kilograms.
- 2Select how active you typically are.
- 3Read your daily target in litres and 250 ml cups.
How it's calculated
Baseline intake = body weight in kg x 0.033 litres, a widely used rule of thumb.
An activity bonus is then added: sedentary 0 L, lightly active 0.3 L, moderately active 0.5 L, active 0.7 L, very active 1.0 L.
The total is converted to cups by dividing litres by 0.25, since one cup is treated as 250 ml.
Water Intake Calculator FAQs
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