Daily Water Intake Calculator
Calculate how much water you should drink per day based on your weight, activity level, and climate.
How to Use This Calculator
1. Enter your weight in kilograms 2. Select your activity level — how active you are on a typical day 3. Select your climate — hot and humid environments require more water 4. Indicate if pregnant or breastfeeding — both increase hydration needs 5. Click Calculate for your personalised daily water target
Tips to Hit Your Target:
Formula
Base: 35mL × bodyweight (kg) | Adjusted for activity, climate, and pregnancy statusFrequently Asked Questions
Does coffee or tea count towards my water intake?
Yes — despite mild diuretic effects, caffeinated drinks like coffee and tea still contribute to your fluid intake. However, water, herbal tea, and milk are better primary sources.
Can you drink too much water?
Yes — hyponatremia (low sodium from overhydration) is rare but possible, mainly in endurance athletes. For most people, drinking when thirsty plus hitting your daily target is safe.
Does food count towards water intake?
Yes — about 20% of daily water intake typically comes from food. Fruits and vegetables are particularly high in water. This calculator estimates fluid from drinks only.
Why do I need more water in hot climates?
You sweat more in hot and humid environments, losing water and electrolytes. Your kidneys also work harder to regulate body temperature, increasing fluid needs by 300–600mL/day.
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