How Much Water Should You Drink Daily?
Proper hydration affects energy levels, cognitive function, digestion, and overall health. While the common advice of "8 glasses a day" is a reasonable rough guideline, your actual needs depend on body weight, activity level, and climate.
The Calculation Method
This calculator uses a base recommendation of 33ml per kg of body weight, adjusted upward for activity level (exercise increases fluid loss through sweat) and hot/humid climate (increased perspiration).
Sources of Hydration
Your daily water target doesn't need to come exclusively from drinking water — fruits, vegetables, soups, tea, and other beverages all contribute. Water-rich foods like cucumber, watermelon, and oranges can meaningfully offset your direct drinking water needs.
Frequently Asked Questions
Can you drink too much water? +
Yes, though it's rare — overhydration (hyponatremia) can occur with extremely excessive intake, particularly during intense endurance exercise without electrolyte replacement. For typical daily hydration following these guidelines, this isn't a concern.
Does coffee or tea count toward water intake? +
Yes, though caffeinated beverages have a mild diuretic effect. Moderate coffee/tea consumption still contributes net positive hydration — you don't need to subtract it from your water target.
Should I drink more water while exercising? +
Yes — add roughly 500-750ml per hour of moderate-to-intense exercise, more in hot conditions. For workouts longer than an hour, consider electrolyte replacement alongside water.