Editorial Policy

Our content is created to genuinely help people make informed decisions about their health. We follow Google's helpful content guidelines, which means every page is:

• Original and in-depth — written to provide a complete, satisfying answer, not summarised from other sources.
• People-first — designed for humans seeking real health insight, not search engines.
• Demonstrating first-hand expertise — we explain how each formula works and why it matters.
• Leaving readers having learned enough to achieve their goal — no information gaps that require another search.

Every calculator is built on a validated, peer-reviewed formula or clinical guideline. We prioritise primary sources including:

• Peer-reviewed medical journals and clinical studies.
• Guidelines from the World Health Organization (WHO), the U.S. CDC, and the Institute of Medicine (IOM).
• Established clinical equations such as Mifflin-St Jeor, Devine, Boer, and the U.S. Navy and Army circumference methods.
• The Compendium of Physical Activities for MET (metabolic equivalent) values.

Where relevant, we cite the specific formula or guideline directly on each calculator page so you can verify the science for yourself.

Because health information can directly impact wellbeing, every calculator and article on our site is evaluated against the following criteria before publication:

• Formula accuracy — the underlying equation is verified against the original published source.
• Clinical relevance — the tool addresses a genuine health question, not an invented need.
• Limitation disclosure — we state what each calculator can and cannot tell you.
• Plain-language clarity — results are explained in terms anyone can understand, with a medical disclaimer.

Medical science is not static. We periodically review our calculators and articles to ensure they reflect the latest guidelines and evidence. When a formula, classification threshold, or recommendation changes — for example, when the IOM updates pregnancy weight gain guidance — we update the affected tool and note the change.

Each article displays its original publication date. If you notice information that appears outdated or incorrect, please contact us and we will review it promptly.

• Free forever — all calculators are free to use. We never charge for access to health tools.
• No personal data sold — your calculator inputs are not sold to third parties. Read our Privacy Policy.
• Clear advertising — where ads appear, they are clearly distinguishable from content and do not influence our calculations or recommendations.
• Open methodology — we publish the formula behind every calculator so you can verify the math yourself.