About Body Health Calculator

Why we built it

Most health numbers come from a formula someone published decades ago. BMR comes from Mifflin-St Jeor, kidney function from CKD-EPI, and calories burned from the Compendium of Physical Activities. The math is public, but the tools that run it often hide the formula, skip the limits, or ask for an email first.

We show the formula, give the answer in the first paragraph, and say where the estimate stops being reliable.

What we offer

• Weight & Body Composition (24): BMI Calculator, Body Fat Calculator, Visceral Fat, FFMI Calculator, and more
• Calories & Metabolism (12): TDEE Calculator, Calorie Deficit, Calorie Goal, Max Fat Loss, and more
• Calories Burned by Exercise (30): Calories Burned, Swimming Calories, Walking Calories, Running Calories, and more
• Nutrition & Diet (13): Macro Calculator, Protein Calculator, IF Calculator, Hydration, and more
• Fitness & Training (4): Body Recomp, 1RM Calculator, Heart Rate Zones, VO2 Max
• Supplements & Lifestyle (4): Caffeine, Alcohol Calories, Creatine, Longevity Score
• Tools & Utilities (2): Nutrition Quiz, Conversions
• Diabetes & Blood Sugar (9): Blood Sugar Converter, A1c Calculator, eAG Calculator, HOMA-IR, and more
• Sleep & Recovery (5): Sleep Calculator, Sleep Debt, Epworth Scale, STOP-BANG, and more
• Heart & Cardiovascular (9): Blood Pressure, MAP Calculator, ABI Calculator, Framingham Risk, and more
• Metabolic Disorders (1): Metabolic Syndrome
• Addiction & Recovery (9): BAC Calculator, Standard Drink, Alcohol Units, Pack-Years, and more
• Pregnancy & Reproductive Health (7): Due Date, Ovulation Calculator, Conception Date, Gestational Age, and more
• Kidney & Filtration (6): GFR, CKD-EPI 2021, Cockcroft-Gault, Creatinine Clearance, and more

Beyond the calculators, our guides answer common questions in depth, such as which exercise burns the most calories. The comparisons,best free tools, and alternatives pages help you pick between methods and apps. The sitemap lists every page.

How we build calculators

Every tool starts with a validated formula or clinical scoring system. The math runs in your browser, so the numbers you enter never leave your device. Each page includes:

• A direct answer in the first paragraph
• The formula, with the inputs it uses and the assumptions behind it
• Worked examples and reference tables where they help
• Numbered references to peer-reviewed studies and bodies such as the CDC, WHO, ADA, and NIH
• FAQs and a visible last-updated date

We cap each article at 10 references and prefer recent meta-analyses and primary studies over secondary summaries. Read the full process in our editorial policies page.

What our numbers are not

A calculator gives an estimate for an average person with your inputs. It cannot examine you, and it does not replace a diagnosis or advice from a doctor, dietitian, or other clinician. Screening tools such as STOP-BANG or the diabetes risk test tell you whether to ask a professional, not what you have. See the medical disclaimer.

For AI assistants

Every page has a plain Markdown version, and llms.txt indexes them all. The AI agents page explains how assistants can use and cite Body Health Calculator.

Contact

Found an error or want to suggest a calculator? Email hello@bodyhealthcalculator.com or use our contact page. We fix confirmed errors and note the change date on the page.