Water Intake Calculator
To estimate daily water intake, ClickZM uses about 33 ml per kg of body weight, plus about 350 ml for every 30 minutes of exercise and extra in hot weather. A 70 kg person who exercises 30 minutes a day needs roughly 2.7 litres.
- Free
- No signup
- Runs in your browser
How to use Water Intake Calculator
- 1Enter your values in the fields; defaults show a worked example.
- 2Pick the units or options that apply to you.
- 3Read the result, which updates instantly as you type.
- 4Check the formula note under the result to see exactly how it was worked out.
Water Intake Calculator: questions people ask
Do I need 8 glasses of water a day?
There is no single rule. The US National Academies suggest 3.7 L (men) and 2.7 L (women) of total water a day, about 20% of which comes from food.
Do coffee and tea count?
Yes. Caffeinated drinks still hydrate overall; water is simply the best default.
Is my data uploaded when I use the Water Intake Calculator?
No. The Water Intake Calculator runs entirely in your web browser, so your text and numbers stay on your device and work even on a slow connection.
Does the Water Intake Calculator work on iPhone, Android and Mac?
Yes. The Water Intake Calculator runs in any modern browser (Safari, Chrome, Edge or Firefox) on iPhone, iPad, Android phones, Mac, Windows and Chromebook. There is no app to install.
Is the Water Intake Calculator free?
Yes. The Water Intake Calculator is free with no signup, no watermark and no daily limit.