Health & Fitness
Water Intake Calculator
Estimate your daily water target from weight and activity.
Water Intake Calculator
Daily water target
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Cups (8 oz)—
Fluid ounces—
A general guideline — individual needs vary with climate, health and diet.
How much water should you drink?
A common guideline is about 35 ml per kilogram of body weight, plus extra for exercise. This calculator estimates your daily target in liters, cups and fluid ounces.
Frequently asked questions
How much water should I drink a day?
Roughly 35 ml per kg of body weight (about 2–3 L for most adults), plus more when you exercise or in hot weather.
Does coffee or tea count?
Yes — most fluids count toward hydration, though water is best. Very high caffeine intake can have a mild diuretic effect.
Can I drink too much water?
Rarely, but drinking extreme amounts quickly can be dangerous. Spread your intake through the day.