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Water Intake Calculator
"8 glasses a day" isn't wrong exactly, but it's a rough average that ignores your body size, how active you are, and the climate you live in. Below, you'll get a range built around your own numbers instead — and it's a range on purpose. Nobody should be handing out an exact prescription here.
Even mild dehydration, as little as 1-2% of body weight in fluid loss, can noticeably dent concentration, mood, and physical performance. Takes thirty seconds to get a number that's actually calibrated to you rather than a generic guess.
Estimated daily fluid target
3.1–3.4 litres
How this estimate is built
We start from a base of 30–35 ml per kg of body weight (a commonly used clinical rule-of-thumb range), add roughly 350 ml for every 30 minutes of exercise to cover sweat loss, and add a climate allowance for hot/humid conditions. The result is an estimate range, not an exact prescription.
Signs you might need more water
- Dark yellow urine. Pale, straw-colored is generally the sign you're well hydrated; the darker it gets, the more your body's asking for fluids.
- Headaches and low energy. Easy to miss, but one of the earlier signs of mild dehydration.
- Waiting until you feel thirsty. By then you're usually already a bit behind — sipping through the day works better than waiting for thirst to remind you.
One thing worth knowing: fruits, vegetables (watermelon, cucumber, oranges), and dishes like dal or curries with a lot of liquid in them already count toward your total. You don't need to hit the full number from plain water alone.
This tool provides a general estimate for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Individual results vary based on factors this calculator doesn't measure (body composition, medical conditions, medications). Always consult a doctor or registered dietitian before making significant changes to your diet or exercise routine.
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Frequently Asked Questions
It's a fine rough average, about 2 litres, but it ignores body size, activity, and climate entirely. A bigger, more active person living somewhere hot needs meaningfully more than that. This calculator tries to actually account for those things instead.