Water Intake Calculator
Estimate how much water to drink each day based on your body weight and how much exercise you do.
Minutes of moderate exercise per day.
Enter your body weight to see an estimate.
This gives a rough daily water target from your body weight, with an allowance for exercise. Your real needs vary with climate, diet and health — treat it as a starting point, and remember food and other drinks count too.
Frequently asked questions
No — it estimates total daily water needs. In practice, food (especially fruit and vegetables) and other drinks provide a meaningful share of your intake, so you won't need to drink the entire figure as plain water.
It's a rough rule of thumb rather than a scientific requirement. Needs vary a lot with body size, activity and climate, which is why this calculator scales with your weight and exercise instead.