Your trusted source for evidence-based fitness calculators and honest information about natural muscle building
Muscle FFMI was created to provide fitness enthusiasts, athletes, and anyone interested in body composition with accurate, science-based tools and honest information about natural muscle building potential.
In an industry filled with unrealistic expectations, misleading claims, and physiques achieved through performance-enhancing drugs being marketed as "naturally attainable," we saw a need for honesty and transparency. Too many people waste years chasing impossible standards, becoming frustrated and disillusioned when they can't replicate results that required pharmaceutical assistance.
We believe everyone deserves access to accurate information about what's realistically achievable naturally. By understanding metrics like FFMI (Fat-Free Mass Index), body composition, and natural genetic limits, you can set realistic goals, track meaningful progress, and appreciate your achievements within the context of natural potential.
Muscle FFMI offers a comprehensive suite of free tools and resources:
Unlike many fitness websites that promote unrealistic expectations or sell expensive programs and supplements, Muscle FFMI focuses on education and empowerment:
Every piece of information we provide is based on peer-reviewed scientific research and validated formulas. We don't promote unproven methods or rely on anecdotal evidence.
We tell the truth about natural limits, realistic timelines, and what actually works. No exaggerated claims, no misleading marketing, no false promises.
Our tools and content are designed to help you make informed decisions about your fitness journey. Your success and understanding matter more than anything else.
Your personal data belongs to you. We process all calculations locally in your browser and never send your information to our servers.
Quality fitness information shouldn't be behind paywalls. All our tools and content are completely free and will remain so forever.
We don't just give you numbersβwe help you understand what they mean and how to use them to achieve your goals effectively.
Muscle FFMI serves anyone interested in understanding their body composition and natural muscle-building potential:
Understand your FFMI, set realistic competitive goals, and track progress objectively. Our tools help you maximize natural development without pharmaceutical enhancement.
Whether you're trying to build muscle, lose fat, or improve body composition, our calculators provide objective data to track progress and adjust your approach.
Avoid the frustration of chasing unrealistic goals. Understand what's achievable naturally and set yourself up for long-term success with realistic expectations.
Use our tools to assess clients objectively, set appropriate goals, and educate them about realistic natural development timelines.
If you're tired of exaggerated claims and want honest, evidence-based information about fitness and body composition, you're in the right place.
We're committed to maintaining Muscle FFMI as a reliable, ad-free resource for evidence-based fitness information. Our calculators and content will always remain free to use, and we'll continue updating our resources as new research emerges.
We believe that accurate information should be accessible to everyone, regardless of budget or background. Whether you're a competitive athlete or just starting your fitness journey, you deserve honest answers and reliable tools.
We're always looking to improve and expand our resources. If you have questions about our calculators, suggestions for new features, or feedback about our content, we'd love to hear from you.
Get in touch: Visit our Contact Page to send us a message. We read every email and do our best to respond within 24-48 hours.
Found an issue? If you've discovered a bug, calculation error, or outdated information, please let us know so we can fix it immediately.
Want to contribute? If you're a researcher, fitness professional, or have expertise in body composition science, we're interested in collaborating to improve our resources.
Thank you for trusting Muscle FFMI as your resource for evidence-based fitness information.