Water Intake Calculator
A daily hydration target from your weight and activity.
Free to use · No account required
Enable JavaScript to use the interactive Water Intake Calculator. The input fields and calculations run in your browser.
How it works
Baseline ≈ 35 ml per kg of body weight per day, plus ~350 ml per 30 minutes of exercise. A common alternative rule is body weight (lb) ÷ 2 = ounces per day.