Q. How much water per day?
30-35 ml per kg of body weight is the general guideline. A 70 kg adult needs roughly 2.1-2.5 L. The calculator does the math based on your weight.
Q. Do coffee and tea count?
Caffeine is mildly diuretic but moderate intake (≤3 cups) still hydrates. We recommend tracking pure water in this app to avoid overcounting.
Q. How much extra for exercise or hot weather?
Add 500-800 ml per hour of heavy sweating. Outdoor summer or intense exercise can push daily needs to 1.5-2× the baseline.
Q. Is it better to drink lots at once?
No. Drinking >1 L in one go strains the kidneys and risks hyponatraemia. Spread 200-300 ml across 8-10 times a day instead.
Q. Does it reset at midnight?
Yes — daily auto-reset, with the running history available on a separate chart. Data stays in your browser.
Q. Can drinking too much water be dangerous?
Yes. 4-5 L in a short window can cause hyponatraemia. For healthy adults, ~1.5× the recommendation is a safe ceiling.
