Water Intake Calculator
Calculate your recommended daily water intake based on weight and activity level. Find out how many glasses, cups, or liters you should drink each day.
Frequently Asked Questions
How is daily water intake calculated?
A common formula is 35 ml per kg of body weight, adjusted for activity level. Sedentary individuals need less, while very active people and athletes need significantly more. An additional 500 ml is added for hot or humid climates, as sweating increases water loss.
Does coffee or tea count toward water intake?
Yes, but with caveats. Coffee and tea do contribute to fluid intake, though their caffeine content has a mild diuretic effect. A good rule of thumb is to drink an extra glass of water for every caffeinated drink you consume. Plain water remains the best hydration source.
What are signs of dehydration?
Early signs include dark yellow urine, dry mouth, thirst, headache, and fatigue. More severe dehydration causes dizziness, rapid heartbeat, and confusion. Aim for light yellow urine as a simple hydration indicator throughout the day.