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How much water should you actually drink? Forget the one-size-fits-all 'eight glasses' line — your needs scale with your body size and how much you move. This free water intake calculator estimates a sensible daily target from your weight and today's exercise, in millilitres and litres. It also explains why thirst and urine colour are better pilots than any fixed number, and when you genuinely need more than plain water. A rough guide built for real life, not a prescription.
Estimate a sensible daily water target from your weight and exercise — a rough guide, adjusted for your climate and thirst.
No — needs vary with size, activity, climate and diet. A lighter, mostly seated person may need well under 2 litres; a large active person in summer needs more. That is why this calculator uses your weight and exercise.
Yes. Food contributes a real share of daily fluid, and moderate caffeine does not dehydrate you meaningfully. Your total fluid matters more than the source.
In extreme amounts, yes — but for ordinary people the bigger risk is drinking too little. If you have heart, kidney or liver conditions, ask your doctor about a safe fluid target for you.
Every tool answers instantly from our own knowledge and calculators — educational only, never a diagnosis. Want the deeper, personalised version? Each has a $2.95 full report.