Most health calculators online run on outdated formulas, skip their sources entirely, or bury a simple result behind an ad wall or a forced sign-up. We built Body Calculator to be the opposite of that: every tool here uses the same formulas a physician or registered dietitian would actually use, reviewed by real credentialed specialists, with the source cited right on the page so you never have to take our word for it.
Reviewed by Real Experts
Every calculator on this site is checked by a licensed professional before it goes live, and re-checked whenever the underlying guidelines change. That review covers the formula itself, the category cutoffs used to interpret your result, and the written explanation around it.
Kevin Cyr, MD
Internist
Kevin Cyr, MD, is a board-certified internal medicine physician who trained at Stanford University School of Medicine and completed his residency at Cedars-Sinai Medical Center.
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Lynn Marie Morski, MD, JD
Sports Medicine Physician
Lynn-Marie Morski, MD, JD, is a board-certified sports medicine physician who trained at the Mayo Clinic and completed a fellowship at the University of Arizona.
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Kimberly Langdon, MD
Gynecologist
Kimberly Langdon, MD, is a retired, board-certified obstetrician/gynecologist with 19 years of clinical practice, trained at The Ohio State University.
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*Institutional training references describe reviewer educational backgrounds only and do not constitute an endorsement or affiliation by those institutions.
What We Stand For
Real formulas, not shortcuts
Every calculator is built on the specific method recognized by public health authorities, the CDC, WHO, and NHLBI among them, and peer-reviewed research, never a simplified version that's easier to code but less accurate.
Checked by someone qualified to check it
Before anything goes live, the math, the category cutoffs, and the written explanation are reviewed line by line by a licensed professional in that specific field, physicians for clinical measurements, registered dietitians for nutrition tools, exercise physiologists for performance calculators.
Everything is verifiable
Every source we rely on is cited and linked at the bottom of the page it supports. If you want to check our work, the citation is right there.
Your numbers stay yours
Every calculation runs locally in your browser. Your height, weight, age, and any other input are never sent to, processed by, or stored on our servers.
No paywalls, no games
Every calculator is free to use, with no account requirements, no forced email collection, and no clutter getting between you and your result.
Read our full Medical Disclaimer.
Questions or Feedback?
Have a suggestion, a feature request, or think you've spotted an error? Contact us at contact@bodycalculator.com, or visit our Contact page.