Water Intake Calculator

It uses the common "half your body weight in ounces" rule of thumb as a base, then adds 12 extra ounces for every 30 minutes of daily exercise to account for additional fluid loss through sweat — this is a widely-cited general guideline, not a clinically precise requirement.

No — this is a general wellness estimate, not medical advice. People with kidney disease, heart conditions, or other conditions affecting fluid balance should follow their doctor's specific fluid guidance rather than a generic formula, since those conditions can require significantly different (often lower) intake targets.

No — this estimates total water-equivalent fluid intake, but roughly 20% of daily hydration typically comes from food (especially fruits and vegetables) in a normal diet, so your direct beverage intake might reasonably be somewhat lower than the raw total shown here.

Sweating during exercise causes fluid loss that needs to be replaced beyond baseline hydration needs — the calculator adds a rough estimate (12oz per 30 minutes) based on typical moderate-intensity exercise, though actual sweat rate varies significantly by individual, climate, and exercise intensity.