VitalMetrics is a small, independent site built around one idea: the health numbers people search for most — BMI, calorie needs, body fat, hydration — should be free, fast, and explained honestly, without an account, an app download, or a sales pitch attached.
Every calculator on this site uses a named, published formula (Mifflin-St Jeor, the U.S. Navy circumference method, the Devine formula, Naegele's rule), and every result page says plainly what the formula does and doesn't capture. We'd rather you trust the site a little less and understand your number a little more.
VitalMetrics provides general informational and educational content only. Nothing on this site — including any calculator result, article, or guide — is medical advice, and none of it is a substitute for diagnosis, treatment, or guidance from a qualified physician or other healthcare provider.
Formulas like BMI, TDEE, and body fat estimates are population-level approximations. They can be meaningfully wrong for a given individual, particularly athletes, people who are pregnant, children, older adults, and anyone with an existing medical condition. Always consult a healthcare professional before making decisions about diet, exercise, or any health condition based on information from this site.
VitalMetrics is supported by advertising, which keeps every calculator free with no sign-up. Ads are served by a third-party network and may use cookies to serve relevant advertising — see our Privacy Policy for details.