Water Intake Calculator
Get a rough daily water goal based on your body weight, how much you exercise and whether you're in a hot climate — shown in litres and glasses.
Body weight (kg)
Exercise per day (minutes)
Target intake
3.1 litres/day
Roughly
12 glasses
250 ml each
A rule-of-thumb estimate (about 33 ml per kg). Food contributes another ~20% of your fluid. Drink to thirst and check that urine stays pale yellow; people with kidney or heart conditions should follow their doctor’s limit.
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Free to use, no sign-up. Calculations run in your browser — nothing you type is sent to a server. These tools are for general information only, not professional advice. See the full tool list.