Water Intake Calculator
How much water to drink per day based on weight and activity.
Per day
2.7 L
Cups (240 ml)
11
Guide: ~33 ml per kg of body weight + ~350 ml per 30 min of exercise.
Frequently asked questions
How much water should I drink a day?
A guide is about 30–35 ml per kilogram of body weight, plus extra for exercise and hot weather. This calculator uses ~33 ml/kg plus an activity top-up.
Do coffee and tea count?
Yes, most drinks contribute to fluid intake, though water is the best choice. Water-rich foods (fruit, soups) also help.
Can too much water be harmful?
Rarely, drinking a very large amount in a short time can dilute blood sodium (hyponatremia). Stick to the guideline amounts unless a doctor advises otherwise.