Water Intake Calculator
Find your personalized daily water target based on your body weight, exercise and climate — shown in litres, cups and bottles. Free hydration calculator, metric & imperial.
Body weight
Daily exercise0 min
Climate
Enter your weight to see your target
How to use the Water Intake Calculator
- 1
Enter your body weight (kg or lb).
- 2
Set your daily exercise minutes.
- 3
Choose your climate.
- 4
See your recommended water in litres, cups and bottles.
Frequently asked questions
How is it calculated?
It starts from about 33 ml per kg of body weight, adds ~350 ml for every 30 minutes of exercise, and adds 10% for a hot climate.
Does food count?
Foods and other drinks contribute to hydration too, so treat this as a target for total fluids across the day.
Is this medical advice?
No — it's a general guide. Needs change with health, pregnancy and medication; consult a professional if unsure.
Tips & discussion
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