About HydrationGuide
Your trusted source for accurate, science-backed hydration information and personalized water intake recommendations.
Our Mission
After years of seeing people struggle with headaches, fatigue, and health issues that often trace back to inadequate hydration, we built HydrationGuide to cut through the noise. There's too much conflicting advice out there—from the outdated "8 glasses a day" rule to marketing claims that don't hold up to science.
Our goal is straightforward: give you tools and information based on what actually works, not what sounds good. We pull from research published in journals like the Journal of the American College of Nutrition and guidelines from organizations like the National Academies of Sciences, Engineering, and Medicine. Then we translate that into calculators and guides you can actually use.
What We Do
Personalized Calculators
Our calculators use research-based formulas that account for your body weight, activity level, climate, and health conditions.
Evidence-Based Articles
We write articles that cite peer-reviewed studies and medical guidelines. When we debunk myths, we explain why with references you can verify.
Specialized Guidance
We create targeted content for groups with unique hydration needs, including seniors, athletes, and people with health conditions.
Transparent Sources
Every recommendation links back to its source—whether it's medical guidelines, peer-reviewed studies, or clinical practice standards.
Our Values
Accuracy First
When research contradicts popular advice, we go with the research. If we don't have solid evidence for something, we say so instead of making it up.
No Medical Claims
We provide information and tools, not medical advice. If you have a health condition affecting hydration, we always recommend consulting with your healthcare provider.
Privacy Protection
We don't sell your data. Calculator inputs stay in your browser—we don't even see them unless you explicitly share results with us.
Free and Open
All our calculators and articles are free. We believe good health information shouldn't be locked behind paywalls.
Our Story
HydrationGuide started in 2025, but the problem it solves has been around much longer. I was on a multi-day hike in the mountains when I started feeling dizzy and nauseous. I'd been drinking what I thought was enough water—following the standard advice everyone hears. It wasn't enough. After that experience, I dug into the research and realized how much of what we "know" about hydration is either oversimplified or just wrong.
The "8 glasses a day" rule? It comes from a 1945 recommendation that didn't account for the fact that you get water from food, other beverages, and metabolic processes. A 150-pound person doing light office work needs different amounts than a 200-pound athlete training in hot weather. Yet most advice treats everyone the same.
So we built calculators that actually account for these differences, and we write articles that explain the "why" behind the recommendations. We're not trying to replace medical advice—if you have kidney disease, heart failure, or other conditions, you need to work with your doctor. But for most people, understanding how hydration actually works can make a real difference in how they feel day to day.
How We Ensure Quality
I work with registered dietitians and exercise physiologists who review our content before it goes live. They check that our calculators use formulas aligned with current research—like the equations from the American College of Sports Medicine for athletes, or the National Academies' dietary reference intakes for general populations.
When we write about topics like elderly hydration or exercise-induced dehydration, we cite peer-reviewed studies. We also stay current with guidelines from organizations like the Academy of Nutrition and Dietetics and the European Food Safety Authority. If new research comes out that changes our understanding, we update the content.
Content Review Process
Every article goes through fact-checking against primary sources. We don't just cite other health websites—we go back to the original research papers, clinical guidelines, and position stands from professional organizations.
Calculator Validation
Our calculator formulas are based on published research. For example, our athlete calculator uses the sweat rate estimation methods validated in studies published in the Journal of Athletic Training. We test edge cases and make sure the math is sound.
Our Impact
Have Questions or Feedback?
Found an error? Have a suggestion for a new calculator? Want to share how hydration changes helped you? We'd love to hear from you.
Contact Us