Daily Water Intake Calculator

Yes — despite mild diuretic effects, caffeinated drinks like coffee and tea still contribute to your daily fluid intake. Research shows that moderate caffeine consumption (up to 400mg/day) does not cause net fluid loss. However, water, herbal tea, and milk are better primary sources.

Yes — hyponatremia (dangerously low sodium caused by overhydration) is rare but real, mainly in endurance athletes who drink large amounts of plain water during long events. For most people, drinking to thirst plus hitting a reasonable daily target is perfectly safe. Do not drink far beyond your calculated target without medical guidance.

Yes — roughly 20% of daily water intake typically comes from food. Cucumbers, watermelon, lettuce, oranges, and soups are all high in water content. This calculator estimates fluid requirements from drinks only, so your actual total intake will be somewhat higher once food is included.

In hot and humid environments you sweat significantly more to regulate body temperature. Sweat losses in tropical conditions can exceed 1–2 litres per hour during activity. Even at rest in high humidity, your body loses more moisture through respiration and skin evaporation, increasing daily fluid needs by 300–600mL or more.

A practical guide is to drink 500mL of water in the 2 hours before exercise, sip 150–250mL every 15–20 minutes during exercise, and rehydrate fully afterwards. For longer sessions, weigh yourself before and after — every kilogram of weight lost equals approximately 1 litre of fluid to replace.

Yes — sparkling water is just as hydrating as still water. The carbonation does not reduce its hydrating effect. Some people find it easier to drink larger amounts of sparkling water, which can be helpful for people who struggle to meet their daily targets with plain still water.