Water Intake Calculator
Calculate your daily water intake needs based on weight, activity and climate.
Details
Result
Daily water target
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In cups (8 oz)—
In glasses (250 ml)—
From food (~20%)—
From drinks only—
A common recommendation is 8 glasses (2 litres) per day, but actual needs depend on body weight, activity, and climate. The formula used here: 33 ml × body weight in kg, adjusted for activity and climate. About 20% of daily water intake typically comes from food.
Frequently asked questions
How much water should I drink daily?
General guidance is 2–3 litres for adults, but your specific needs depend on weight, exercise level, and climate.
Does coffee count toward water intake?
Yes — despite mild diuretic effects, caffeinated drinks still contribute to net hydration.