Water Intake Calculator

This calculator estimates how much water you should aim to drink each day based on your body weight and how active you are.

The estimate starts from a common guideline of roughly 33 ml of water per kilogram of body weight, then adjusts up or down depending on your activity level. More active days mean more fluid lost through sweat, so the target increases.

Remember that food, weather, and individual health all affect your needs. Use the result as a friendly daily target rather than a strict rule, and drink more when you feel thirsty or exercise heavily.