Water Intake Calculator – How Much Water Should You Drink Per Day?
Staying hydrated is one of the simplest ways to improve your health. But how much water do YOU need? Our water intake calculator gives you a personalized daily water goal based on your weight, activity level, and climate.
Water Intake Calculator
Daily Water Intake by Weight
| Body Weight | Liters/day | Oz/day |
|---|---|---|
| 50 kg (110 lbs) | 1.65 L | 56 oz |
| 65 kg (143 lbs) | 2.15 L | 73 oz |
| 80 kg (176 lbs) | 2.64 L | 89 oz |
| 100 kg (220 lbs) | 3.3 L | 112 oz |
Frequently Asked Questions
Is 8 glasses of water a day enough?
The “8 glasses” rule is a rough guideline. Your actual needs depend on body size, activity, and climate. Many adults need 2–3+ liters per day.
Does coffee and tea count toward water intake?
Yes — beverages like coffee and tea contribute to your daily fluid intake, despite being mild diuretics. Water-rich foods (cucumbers, watermelon) also count.
How do I know if I am drinking enough water?
Check your urine color. Pale yellow means well-hydrated. Dark yellow or amber means drink more water right away.