Water Intake Calculator
Find out how much water you should drink per day based on your body weight and how active you are.
100% client-side · no upload
Daily Water Intake
How to use
- Enter your body weight in kilograms.
- Choose your typical daily activity level from the dropdown.
- Click Calculate Water Intake to see your recommended daily intake in millilitres and litres.
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- BMR Calculator — daily calorie needs estimate
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- Heart Rate Zones — cardio training intensity targets
常見問題
- Is this water intake calculator free?
- Yes, completely free with no signup and no usage limits.
- Does my data leave my device?
- No. All calculations run in JavaScript inside your browser. Nothing is sent to any server.
- Does it work on mobile?
- Yes. The calculator is mobile-first and works on iPhone Safari and Android Chrome.