Daily Water Consumption Calculator

This tool estimates your approximate daily water intake based on your weight and age. It uses age‑based guidelines (in ml per kg) and provides handy references in cups (~300 ml) and medium bottles (~500 ml).

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Benefits & insights

Adequate hydration supports brain function, energy levels, and exercise performance. Using ml per kg scales the recommendation to your body and age, producing a practical baseline you can adjust for climate, training, and personal needs.

Water from foods and beverages counts toward total intake. Fruits, soups, tea, and coffee contribute meaningfully; plain water remains the most efficient way to stay hydrated.

FAQs

Is the 8×8 rule accurate? It’s a popular heuristic (eight 8‑oz glasses ≈ 2 liters) but individual needs vary. Our age‑based factors provide a more tailored estimate.

Can you drink too much water? Yes — excessive intake can dilute electrolytes. Aim for steady hydration and listen to thirst, urine color, and comfort.

Trivia

The term “hydration” comes from the Greek ‘hydor’ (water). Studies show even a 1–2% body weight loss from fluids can impair focus and endurance.

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How it works

• 0–17 years: 40 ml per kg
• 18–54 years: 35 ml per kg
• 55–65 years: 30 ml per kg
• 66+ years: 25 ml per kg

Enter your weight (kg) and age (years) and click Calculate.

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Notes

• This is an approximate calculation and does not substitute medical recommendations.
• Hydration needs vary by climate, activity level, health conditions, and diet.

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➡️ Use the calculator above to estimate daily water intake and plan your hydration.