Find your daily water intake target based on weight, activity level and climate.
Find your daily water intake target based on weight, activity level and climate. This tool gives a general estimate based on standard health formulas — it's a starting point for understanding your numbers, not a diagnosis or medical advice.
This calculator estimates your recommended daily water intake based on your body weight, activity level, and the climate you live in. Adequate hydration is essential for regulating body temperature, supporting kidney function, maintaining concentration, and carrying nutrients to cells.
The Australian Dietary Guidelines recommend that adult men drink 2.6 litres of water per day and adult women 2.1 litres — but these figures are for a temperate climate with moderate activity. In the Australian summer, especially in inland or northern areas, needs can be significantly higher. A useful rule of thumb is to drink roughly 35 ml per kilogram of body weight per day at rest, adding 500 ml to 1 litre for every hour of exercise. Urine colour is a practical hydration indicator: pale straw-yellow means well-hydrated; dark yellow or amber means you need to drink more. Note that some medications and vitamins (especially B vitamins) can darken urine regardless of hydration status.
Yes — despite the mild diuretic effect of caffeine, the water in coffee and tea still contributes to daily fluid intake. Research shows that moderate coffee consumption (up to 4 cups per day) does not cause dehydration in people who regularly consume caffeine. Plain water, herbal teas, and water-rich foods (fruit, vegetables, soups) all contribute to your daily total.