Water Intake Calculator
Daily hydration needs
Use this when you need a fast, accurate result — no sign-up, works entirely in your browser.
Daily water intake—
How to Use
- Enter your details into the fields above.
- Click the calculate button to get your result instantly.
- Use the clear button to start a new calculation.
Example
- 70 kg, 30 minutes of daily exercise → 2.67 L per day
- 60 kg, no exercise → 1.98 L per day
Formula
Daily water = body weight (kg) × 0.033 L, plus about 12 mL for each minute of exercise. This total includes drinks and the water naturally present in food, which supplies roughly a fifth of it. Requirements rise with heat, humidity and altitude.
About Water Intake Calculator
Daily hydration needs. This free online tool gives you fast, accurate results without registration or downloads.
Everything runs locally in your browser, so your data is never uploaded or stored — privacy first.
Frequently Asked Questions
Is the Water Intake Calculator free to use? +
Yes, it is completely free with no registration or download required.
Is my health data private? +
Yes. All calculations happen locally in your browser. Your health information is never uploaded or stored.
Is this a substitute for medical advice? +
No. This tool provides estimates for informational purposes only and is not a substitute for professional medical advice.