Kids Water Intake
Children aren't mini adults — their hydration targets run by age, not the weight-based formula we use for grown-ups. Here's the chart, plus how to actually get them to drink it.
Daily Fluid Intake by Age
Reference ranges follow American Academy of Pediatrics (AAP) and IOM guidance for total daily fluid — water, other beverages and food moisture combined. In practice, aim for water and plain milk to carry most of it.
| Age | Daily Fluid Target | Basis |
|---|---|---|
| 1–3 years | 1.0–1.2 L (34–41 fl oz) | Total fluid incl. food & milk |
| 4–8 years | 1.4–1.6 L (47–54 fl oz) | Total fluid incl. food & milk |
| 9–13 (girls) | 1.9–2.1 L (64–71 fl oz) | Total fluid incl. food & milk |
| 9–13 (boys) | 2.1–2.4 L (71–81 fl oz) | Total fluid incl. food & milk |
Looking for your own target instead? The adult water intake calculator is one click away.
Why Age Beats Weight for Kids
The adult 35 ml-per-kg rule assumes mature sweat rates, kidney concentration ability and body-water distribution — none of which are fully developed in early childhood. Toddlers, for instance, exchange a larger share of their body water each day but sweat far less than teenagers. Pediatric guidance therefore anchors to age bands with wide ranges, letting appetite, thirst and the weather do the fine-tuning. Two extra notes from pediatricians: active kids playing sports in heat can need an extra 300–500 ml per hour of activity, and children with fever or stomach bugs lose fluid fast — small, frequent sips of water or an oral rehydration solution beat big gulps.
Frequently Asked Questions
How much water should my child drink each day?
It scales with age: roughly 1–1.2 liters of fluid from food and drink at ages 1–3, about 1.4 liters at 4–8, and 1.9–2.1 liters (girls) or 2.1–2.4 liters (boys) at 9–13. Plain water should make up most of it; use the chart above for the full breakdown.
Do milk and juice count toward my kid's water intake?
Yes — all fluids count, and for toddlers milk is a major contributor. Keep 100% juice to small amounts (the AAP suggests under 4–6 oz a day) and make water and milk the default drinks, so hydration doesn't arrive with added sugar.
How can I get my child to drink more water?
Make it visible and fun: cups with straws or marked levels, water served at every meal and snack, a filled bottle in the school bag, and parents visibly drinking water themselves. Kids reliably drink more when water is the easiest option in reach.
Related Tools & Guides
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Water Intake for the Gym
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Elderly Water Intake
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Signs of Dehydration
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Coffee and Hydration
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Best Times to Drink Water
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