About Water Intake Calculator

Water Intake Calculator is a free, science-backed tool that helps millions of people every month find out exactly how much water they should drink each day — personalized to weight, age, gender, activity level and climate.

Our Mission

Up to 75% of adults are chronically mildly dehydrated, and most never realize it. Headaches, brain fog, fatigue, and cravings are often water-deficit symptoms in disguise. Our mission is simple: help every visitor reach optimal hydration, completely free, forever.

How We Built the Calculator

The calculator combines guidelines from the U.S. National Academies of Sciences, Engineering & Medicine, the Mayo Clinic, and peer-reviewed research published in The American Journal of Clinical Nutrition. We use a base formula of 35 ml per kilogram of body weight, then layer activity, age, gender and climate adjustments to give you a personalized number — not a one-size-fits-all guess.

Who We Are

We are a small independent team of developers, designers, and health-tech enthusiasts who believe simple tools can drive massive health improvements. Every feature on this site is hand-coded, ad-light, and built for speed.

Contact

Got feedback or want to partner with us? Reach out at oursuna46@gmail.com.