Contact Us
Last updated: June 9, 2026
Questions, feedback, or corrections about Lean Mass Calculator? We'd love to hear from you.
How we can help
We build our calculators to be as accurate and transparent as possible. If you spot an error in a formula, a missing citation, or have a suggestion for a new feature, we want to hear about it.
Please note: We cannot provide medical, nutritional, or fitness advice. If you have questions about your personal health data, please consult a qualified healthcare professional.
Response times
We aim to respond to all technical enquiries and bug reports within 2 business days. General feedback is reviewed weekly.
Business & Press
For business partnerships, syndication requests, or press enquiries, please use the email address below with an appropriate subject line.
Company details: HealthTools Media Ltd., 27 Old Gloucester Street, London WC1N 3AX, United Kingdom.
Frequently Asked Questions
Q: How often are the calculators updated? A: We review our formulas and scientific literature quarterly to ensure all tools use the most up-to-date and accurate methodologies available.
Q: Can I use your data for my research? A: Yes, our calculators are built on established scientific formulas (like Boer and James). However, if you are using our specific charts or tools for academic research, we appreciate a citation to our website.
Q: Do you offer an API for these calculators? A: At this time, we do not offer a public API. However, we are actively evaluating the demand for one. If you have a specific use case, please reach out via email.
Q: What should I do if a calculation seems incorrect? A: First, ensure all inputs (especially unit selections like kg vs lbs) are correct. If you still suspect a bug, please email us with the exact inputs you used and the output you received so we can replicate and fix the issue promptly.
Q: Are there advertising opportunities on your site? A: We are open to discussing relevant, high-quality sponsorships that provide value to our users. Contact us with your proposal.
Q: Can I request a specific feature or a new type of calculator? A: Absolutely! Many of our current tools and charts were built directly from user requests. If there's a specific body composition metric or formula you'd like to see, let us know.
Q: Do you retain any personal health data entered into the calculators? A: No. All calculations are performed instantly in your browser or without saving personal data to our servers. We value your privacy above all else.