💧 Daily Water Intake Calculator
Find out how much water you should drink each day based on your weight, activity, and climate.
About Daily Hydration
The standard "8 glasses a day" rule is a rough guide. Actual needs vary significantly based on body size, how much you sweat, and environmental conditions. This calculator uses a weight-based formula adjusted for activity and climate.
Coffee and tea count. Despite the mild diuretic effect, research shows caffeinated drinks contribute net fluid. Aim for about 80% of your total from plain water.
Food hydrates too. Fruits and vegetables contribute roughly 20% of daily fluid intake — cucumbers, watermelon, lettuce, and strawberries are over 90% water.
Signs of adequate hydration: pale yellow urine, no persistent thirst, good energy levels. Dark urine or persistent headaches often signal dehydration.