Calculate daily water intake goal
A water intake calculator estimates how much water you should drink daily based on your body weight and activity level. It provides a personalized starting point rather than relying on the generic 'eight glasses a day' rule, which doesn't account for individual differences.
Daily Water (ml) = Body Weight (kg) × 30–35 ml, adjusted upward for exercise and hot climates
Not really — it's a rough generalization that doesn't account for body size, activity level, or climate. A body-weight-based estimate is more personalized, though individual needs still vary.
Exercise increases fluid loss through sweat, so additional water (often an extra 12-16 oz per 30 minutes of exercise) is recommended on top of your baseline daily intake.
Yes — excessive water intake can dilute sodium levels in the blood (hyponatremia), which is rare but serious. Most healthy adults following body-weight-based guidelines won't approach this level, but it's a real risk in extreme cases like ultra-endurance events.
Yes — hot and humid conditions increase fluid loss through sweat, so recommended intake typically increases in warmer climates or seasons.
Yes — beverages like tea, coffee (in moderation), and milk, along with water-rich foods like fruits and vegetables, all contribute to overall hydration, not just plain water.