Daily Water Intake Calculator
Get a personalized daily water intake recommendation based on body weight, activity level, climate, and pregnancy/breastfeeding status. Shows result in liters, cups, and 500mL bottles.
Hourly Schedule (16 waking hours)
How to read your results
This is a minimum target. Thirst, urine color (aim for pale yellow), and energy levels are better real-time indicators. Coffee and tea count toward hydration — they're about 90% water.
How it works
This daily water intake calculator runs entirely in your browser — no data is sent to any server. Simply fill in the fields above and the result updates instantly. You can copy the output with the copy button provided.
Frequently Asked Questions
Is the '8 glasses a day' rule accurate?
The 8×8 rule is a rough approximation. Actual needs vary by body weight, activity, and climate. A 100kg athlete in hot weather may need 4+ liters; a 50kg sedentary person needs ~1.7 liters.
Does coffee count toward daily water intake?
Yes — coffee and tea are ~98-99% water and contribute net positive hydration. Alcohol does not count and increases water needs.