Hydration
A bodyweight-based baseline, adjusted for how active you are and how hot it is.
How much water should I drink per day?
A commonly cited baseline is around 33ml per kg of bodyweight per day, adjusted upward for exercise and hot or humid climates. That's a general guideline rather than a hard medical target — thirst and urine colour (pale yellow is a good sign) are more reliable real-time signals than any fixed number, and needs vary with individual health, medications and climate.
Frequently asked questions
Does coffee or tea count toward water intake?
Yes, in moderate amounts — the old idea that caffeine causes net fluid loss is largely outdated; normal caffeine intake still contributes to overall hydration.
How do I know if I'm drinking enough water?
Pale yellow urine and infrequent thirst are good practical signs. Dark yellow urine or frequent thirst usually means it's time to drink more.
Do I need more water when exercising?
Yes — this calculator adds extra based on how long you exercised, and hot or humid conditions increase fluid loss through sweat further still.
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