Daily water needs, sweat rate, and electrolyte replacement calculators. Browse our free hydration tools below — all calculators are instant, accurate, and require no sign-up.
Daily Hydration Calculator — Calculate your daily water intake needs based on body weight, activity level, and climate. Get a personalized hydration schedule with hourly intake targets.
Electrolyte Replacement Calculator — Estimate sodium, potassium, and magnesium losses from sweat during exercise. Get personalized electrolyte replacement recommendations based on your sweat rate.
Sweat Rate Calculator — Calculate your sweat rate during exercise using pre and post-workout weigh-ins. Determine fluid replacement needs to optimize performance and prevent dehydration.