Water Intake Calculator
Calculate exactly how much water you should drink daily based on your weight, activity level, and climate. Stay optimally hydrated.
Hydration Guidelines
- Base need: ~30 ml per kg of body weight
- Add 500ml for every 30 minutes of moderate exercise
- Add 500ml in hot or humid climates
- Urine color: Pale yellow = well hydrated; dark yellow = drink more
Frequently Asked Questions
How much water should I drink per day?
The general recommendation is 30–35 ml per kg of body weight. Active individuals and those in hot climates need more.
Does coffee count toward my water intake?
Yes, moderate coffee consumption (3–4 cups) hydrates similarly to water. The diuretic effect is mild in habitual drinkers.
Can I drink too much water?
Yes — hyponatremia (low blood sodium) can occur if you drink >1 liter per hour. Spread intake throughout the day.