Last updated: 2026-08-19
1. Welcome
Welcome to BodyCompCheck. This site exists because I got tired of watching smart people feel stupid about their own bodies. Everything here — the calculators, the articles, the rants about BMI — is built on years of hands-on experience running body-composition testing at a high-end fitness studio in Portland. But experience is not a license. And this website is not a clinic.
Before you use any tool or trust any number, you need to understand what this site is and what it is not. That is what this page is for.
2. No Medical Advice
The information, tools, calculators, and articles provided on BodyCompCheck.com are for educational and informational purposes only. They are not intended to be a substitute for professional medical advice, diagnosis, or treatment.
Always seek the advice of your physician, qualified healthcare provider, or certified fitness professional with any questions you may have regarding your health, body composition, or fitness goals. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.
If you are experiencing symptoms, have a diagnosed condition, or are considering significant changes to your diet or exercise routine, talk to a professional first. A free online calculator is not a doctor.
3. Body Science
Body composition estimation methods — including those used in our calculators — have inherent limitations and margins of error. Results should be considered estimates, not definitive measurements. Factors such as hydration status, measurement technique, equipment calibration, and individual variation can significantly affect results.
We clearly state the accuracy ranges of each method on our site. The Navy Method carries ±4-6% error. Consumer BIA scales swing ±5-8%. Even DEXA, the gold standard, has ±1-2% variance. Please use these tools as general guidance, not as precise medical measurements.
Your body is a living system, not a spreadsheet. Water retention, menstrual cycles, sodium intake, sleep quality, and stress all shift your numbers day to day. Track trends over weeks and months. Do not panic over a single reading.
4. Privacy
BodyCompCheck does not collect, store, or transmit any personal health data you enter into our tools. All calculations run entirely in your web browser using JavaScript. Your body weight, measurements, and results never leave your device.
We use browser localStorage to save your tool inputs and calculation history for your convenience. This data is stored on your device only and is not accessible to us or any third party. You can clear this data at any time through your browser settings.
We may use privacy-focused analytics that do not use cookies, do not track individual users, and do not collect personal data. These tools collect only anonymized, aggregated traffic statistics.
5. Liability
Use of this website does not create a doctor-patient, trainer-client, dietitian-client, or any other professional relationship between you and BodyCompCheck, Emily Clarke, or any contributor.
BodyCompCheck and its creators shall not be held liable for any damages arising from your use of the website or reliance on its content. This includes direct, indirect, incidental, consequential, or punitive damages. You assume full responsibility for any actions you take based on the information provided here.
This website may contain links to external websites that are not provided or maintained by BodyCompCheck. We do not guarantee the accuracy, relevance, timeliness, or completeness of any information on these external websites.
6. Contact
If you have questions about this disclaimer, our tools, or anything else on the site, you can reach us at contact@bodycompcheck.com.
General reply time is one to two weeks, sometimes longer. We are a small operation. We read every email. We just read them slowly.
7. Sources
Our calculators and articles are built on peer-reviewed research and established protocols, including:
- Jackson, A.S. & Pollock, M.L. (1978). Generalized equations for predicting body density of men. British Journal of Nutrition.
- Jackson, A.S. et al. (1980). Generalized equations for predicting body density of women. Medicine & Science in Sports & Exercise.
- Hodgdon, J.A. & Beckett, M.B. (1984). Prediction of percent body fat for U.S. Navy men and women from body circumferences and height. Naval Health Research Center.
- Heymsfield, S.B. et al. (2015). Human Body Composition. In Modern Nutrition in Health and Disease.
- ACSM's Guidelines for Exercise Testing and Prescription, 11th Edition.
Where we cite studies, we link to the original source when possible. Where we share opinions, we label them as such.
8. Updates
We may update this disclaimer at any time as our tools evolve, new research emerges, or legal requirements change. The "Last updated" date at the top of this page reflects the most recent revision.
Continued use of the site after changes constitutes acceptance of the revised terms. If you do not agree with any part of this disclaimer, please discontinue use of the site.