Daily Water Intake Calculator
Formula
Liters = Weight (kg) × 0.033
A general guideline is to drink about 33 mL of water per kilogram of body weight. Active people and those in hot climates may need more.
How to use
- Enter your body weight in the Weight (kg) field.
- The tool multiplies by 0.033 to estimate daily liters.
- Read your suggested intake in liters, cups, and fluid ounces.
Example
For a Weight of 70 kg, the suggested intake is 70 × 0.033 = 2.3 liters per day, which is about 10 cups or 78 fluid ounces.
Frequently Asked Questions
How much water should I drink?
A 70kg person should drink about 2.3 liters (≈10 cups) per day. Adjust up for exercise and heat.
Does coffee count?
Moderate coffee intake (1-3 cups) contributes to hydration despite mild diuretic effects.
Does the water in food count toward my daily intake?
Yes, roughly 20% of most people's daily water comes from food, especially fruits and vegetables like watermelon, cucumber, oranges, and soup. That means the liters figure here represents total water needs, and you don't have to drink every drop as plain water. Beverages like milk, tea, and juice also count toward the total.
Can you drink too much water?
Yes, drinking very large amounts in a short period can dilute the sodium in your blood, a rare but serious condition called hyponatremia. This is mostly a risk for endurance athletes or people who force fluids far beyond thirst, not for normal daily drinking. For nearly everyone, spreading intake across the day and drinking to thirst keeps you safely hydrated.