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Water intake calculator
How much water to drink a day for your weight, exercise and climate.
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- Works on any device
About Water intake calculator
Estimate a daily water target from your weight, activity level and climate. A common starting point is about 30 to 35 ml per kg of body weight, with extra for exercise and hot weather. Food, tea and coffee also contribute to your total fluid intake.
How to use Water intake calculator
- Enter your numbers above.
- The result updates instantly as you type.
- Change any value to compare different cases.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Available in 10 languages.
Also known as
Frequently asked questions
Is eight glasses of water a day required?
It is a convenient guide, not a rule. Needs depend on body size, heat and activity. Pale yellow urine is a good sign.
Is Water intake calculator free?
Yes. Water intake calculator on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.