Water Intake Calculator
Find out how much water you should drink daily based on your weight and activity.
How it works
Enter your body weight (in kg or lbs) and activity level (sedentary, moderate, active). The water intake calculator uses the standard formula (30-35 ml per kg of body weight) to recommend your ideal daily water intake in litres and glasses.
Why use this tool?
Staying properly hydrated improves energy, skin health, digestion, and cognitive performance. Most people underestimate how much water they need — this free hydration calculator gives a science-backed daily target.
Frequently Asked Questions
How much water should I drink per day?
The standard recommendation is 30–35 ml per kg of body weight. A 70 kg person needs approximately 2.1–2.45 litres daily. The calculator personalizes this based on your weight and activity level.
Does drinking water help with weight loss?
Yes. Drinking water before meals reduces appetite, and staying hydrated improves metabolism. Studies show that drinking 500 ml of water before meals can reduce calorie intake by 13%.
Does coffee count toward daily water intake?
Moderate coffee (2–3 cups/day) counts toward hydration despite being a mild diuretic. Tea and other low-sugar beverages also count. Alcohol does not — it actively dehydrates.
Is this free?
Yes, completely free with instant personalized hydration recommendations.
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