Water Intake Calculator
Get your personalized daily water intake recommendation based on your body weight, activity level, and climate.
How much water do you really need?
The common advice of "8 glasses a day" is a rough guideline, not a universal prescription. Your actual needs depend on your body size, how active you are, where you live, and other factors like diet and health conditions.
The formula used
This calculator starts with a base of 35 ml per kg of body weight, then adds estimated losses from physical activity and heat exposure. This approach is consistent with recommendations from the European Food Safety Authority (EFSA).
Tips to stay hydrated
Keep a water bottle visible on your desk. Drink a glass before each meal. Eat water-rich foods like cucumber, watermelon, and soup. Urine color is the best free hydration monitor — pale yellow means you're well-hydrated.