Water Intake Calculator

How much water should you drink a day? Get a personalised estimate from your weight and activity.

How it's calculated

A common guideline is 35 ml of water per kilogram of body weight, plus about 350 ml for every 30 minutes of exercise, adjusted for climate. This includes water from all drinks, but not the water naturally in food (which adds roughly another 20%).

Thirst and pale-yellow urine are good everyday signals. People with certain medical conditions should follow their doctor's advice.

For general information only — not medical advice.