💧 Health Calculator

Water Intake Calculator

Find your personalised daily water intake target based on body weight, activity level, climate, and pregnancy status.

Your Details

Enter your weight and lifestyle

Enter your weight
Select your activity level and climate to get your personalised daily water target.

Why Hydration Matters

Water makes up ~60% of the human body. Even mild dehydration (1–2% body weight) impairs cognitive function and physical performance. Dark urine (aim for pale yellow) is the most reliable indicator of dehydration.

Frequently Asked Questions

How much water should I drink per day?
The WHO recommends 35 ml per kg of body weight as a general baseline. Activity, climate, and health status significantly change your needs. This calculator adjusts for all these factors.
Does coffee and tea count toward my water intake?
Yes! Coffee and tea contribute to daily fluid intake. Mild diuretic effects of caffeine are offset by the liquid volume. However, alcohol and highly caffeinated drinks should not be relied upon for hydration.
Can I drink too much water?
Yes — overhydration (hyponatremia) can occur in extreme cases, especially during intense endurance sports. For most people, drinking when thirsty and aiming for pale/clear urine is sufficient guidance.