Find your personalized daily water target based on your body weight, activity level and climate.
This tool estimates daily water needs using a common baseline of roughly half an ounce to one ounce of water per pound of body weight, adjusted upward for higher activity levels and hot or humid climates where fluid loss through sweat increases.
Does coffee or tea count toward this total?
Moderate caffeine intake contributes to hydration too, despite the old myth that it's dehydrating — but plain water is still the most reliable way to hit your target.
What if I have a kidney or heart condition?
Talk to your doctor before using general hydration targets — some medical conditions require restricted or increased fluid intake, and this calculator isn't a substitute for medical guidance.