Water Intake Calculator
Find out how much water you should drink each day to stay hydrated.
Calculate Your Water Needs
Your Daily Water Intake
This includes water from all beverages and food. About 20% comes from food.
How water needs are calculated
Basic water needs are about 30-35ml per kg of body weight. We add more for activity level and hot climates.
Weight (kg) × 35mlActivity adjustment: Add 350-1000ml based on exercise
Climate adjustment: Add 0-500ml for heat/humidity
Drink more if you're pregnant, breastfeeding, sick, or drinking alcohol/caffeine.
FAQs
Is 8 glasses a day enough?
The "8 glasses" rule is a good starting point, but needs vary by weight, activity, and climate.
Does coffee and tea count?
Yes! All fluids count, though caffeine has a mild diuretic effect (makes you pee slightly more).
How do I know if I'm drinking enough?
Check your urine color. Light yellow is good. Dark yellow means drink more.
Can I drink too much water?
Yes, but it's rare. Drinking several liters in a short time can be dangerous (water intoxication).
Do I need more water when exercising?
Yes! Drink 500-1000ml extra for every hour of exercise, depending on intensity and sweating.