About Haftaa
Haftaa is an independent health-and-wellness tools project dedicated to making accurate, science-backed hydration and body-composition calculators freely available to everyone, with no sign-ups, no tracking, and no fluff.
Published by the Haftaa Editorial Team. Last updated: July 2026. Reviewed by our health content review board.
Our Mission
We believe that reliable health information should be accessible to anyone with an internet connection. Too many online calculators are built on outdated formulas, wrapped in intrusive ads, or buried under low-quality content designed only to rank in search engines. Haftaa was built to do better. Every tool on this site uses validated formulas from peer-reviewed research, discloses its methodology openly, and ships in a fast, mobile-friendly, privacy-respecting interface.
Our flagship tool, the Daily Water Intake Calculator, uses a weight-based formula with adjustments for age, sex, activity, climate, and special conditions like pregnancy and breastfeeding. We do not rely on the obsolete "eight glasses a day" rule, and we do not hide our methodology. Every page tells you exactly how the calculation works.
Our Credentials and Expertise
The Haftaa Editorial Team brings together over a decade of combined experience in health communication, nutritional science, and software development. Our content team includes writers with formal training in nutrition and exercise science, and every article is reviewed for accuracy before publication. While we are not a substitute for personalized medical advice, we are committed to providing information that meets the highest standards of accuracy and clarity.
Our editorial process follows the principles of E-E-A-T (Experience, Expertise, Authoritativeness, and Trustworthiness) outlined by Google's Search Quality Rater Guidelines. We cite primary sources, link to authoritative references, and update our content regularly as new research emerges. When the science is uncertain or evolving, we say so clearly rather than presenting speculation as fact.
Editorial Standards
All content on Haftaa is original and written from scratch. We do not scrape, spin, rewrite, or auto-generate articles. Every guide is grounded in established scientific sources, including the U.S. National Academies of Sciences, Engineering, and Medicine; the World Health Organization; the European Food Safety Authority; the American College of Sports Medicine; the U.S. Centers for Disease Control and Prevention; and peer-reviewed journals in nutrition and exercise science.
Our articles are written for real readers, not for search engine algorithms. That means complete explanations, practical takeaways, and honest acknowledgment of where the science is uncertain. Where a calculator's output depends on assumptions, we state those assumptions clearly. We update our content at least quarterly to reflect new research and user feedback.
Privacy First
Haftaa does not collect any personal data through its calculators. All calculations run entirely in your browser — no inputs are sent to our servers, stored, or shared. We do not require accounts, and we do not sell data. Our Privacy Policy explains in plain language what little information we do process (such as aggregate, anonymized traffic statistics) and how third-party advertising works if and when ads are enabled.
How We Make Money
Haftaa is a free resource. We may display advertising through the Google AdSense program to cover our hosting and content creation costs. We do not accept paid sponsorships, paid placements, or affiliate links that could compromise our editorial independence. If we ever add affiliate links in the future, they will be clearly disclosed on the relevant pages and in our Privacy Policy. Our content is never influenced by advertisers — the editorial team operates independently of any advertising relationships.
Contact
We welcome feedback, corrections, and suggestions for new calculators. Email us at contact@haftaa.info or use our contact page. We read every message and typically respond within 1-2 business days.