Child Water Intake Calculator
Estimate how much water a child should drink each day from their weight and the millilitres per kilogram for their age.
Recent
Formula
How the calculation works
The calculator multiplies the child's weight in kilograms by the millilitres per kilogram suited to their age band.
It divides the result by one thousand to show the same amount in litres, which is easier to compare with bottles.
It divides by your cup size in millilitres so you can count cups instead of measuring every pour.
Common mistakes
- Using an adult millilitres per kilogram figure, which suits a heavier body and overstates what a small child needs.
- Counting juice, milk and soft drinks as water, when sugary drinks do not replace plain water for hydration.
When to use it
- Use it on hot days or during sport to know how much extra water a child should drink to stay hydrated.
- Use it to set a simple daily target for a child who forgets to drink during school hours.
Worked example
A 15 kg child at 60 ml per kg needs dailyMl = 15 x 60 = 900 ml, which is 0.9 litres or 3.75 cups of 240 ml.
Common questions
Does this water target include water from food?
No, it covers drinks only, and a child also gets some water from fruit and vegetables, so the target is a drink guide rather than a strict rule.
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