Operational considerations for comparing metrics between different body composition machines with clients.
Understanding Fit3D's Accuracy & Measurement Consistency
At Fit3D, we understand that comparisons are inevitable when it comes to body measurements and fitness tracking. You may have recently undergone an BIA scan, noticed a difference in waist measurements between your favorite jeans brand and our readings, or heard a different body fat percentage from a healthcare professional. These variations may lead to questions about our data’s accuracy.
This article outlines our stance on accuracy and consistency across our SNAP scanner and other Fit3D products.
1. Standardized Landmarking & Measurement Consistency
Our measurement methodology follows the ASTM (American Society for Testing and Materials) guide, an internationally recognized standard. Many measurements taken by individuals, friends, or other sources often introduce human bias. One key distinction is that Fit3D scans measure "hard bodies"—a consistent approach—whereas manual measurements often involve pinching "soft body" areas, leading to variations.
The most crucial factor is consistency. Fit3D ensures that measurements are taken the same way every time, providing a reliable tracking method for changes over time.
2. The Importance of Choosing One Consistent Tool
Tim Ferriss, in The 4-Hour Body, emphasized the importance of selecting one body composition measurement tool and sticking with it rather than switching between devices. We share the same philosophy: consistency is key.
Every body measurement tool, whether Fit3D, bioelectrical impedance, or calipers, relies on specific data inputs to make predictions. No single device has a universal "source of truth." Because different methodologies exist, switching between devices can cause variations that may create doubt.
If you must compare between vendors or tools, keep in mind that each uses a unique formula—none inherently better than the others. Be sure to communicate this to clients as well to prevent them from questioning the effectiveness of your program overall.
Some of our clients use 2 tools. If you are using Fit3D only for our avatars, explain why to your clients, and tell them which values you'll be comparing over time.
3. Psychological Bias in Measurement Preferences
Many individuals naturally gravitate toward numbers that align with their self-perception. Research and field observations show that people often prefer a body fat percentage or measurement that portrays them in a more favorable light.
For instance, if one device reports a body fat percentage of 12% and another says 15%, many will prefer the lower figure. This is a natural psychological bias. Often, when a client insists they "know" their body fat percentage, what they truly mean is they "want" to be at a certain number. Recognizing this bias can help frame conversations more effectively.
4. Accuracy vs. Tracking Progress: The Key Business Insight
From a business perspective, the idea of "accuracy" is often less relevant than the ability to track progress over time. This is the most critical takeaway for operators using Fit3D.
Clients seek transformation—they want to see change. Instead of focusing on isolated accuracy debates, reframing the discussion around personal goals and long-term progress can be far more valuable. For example, if a client has lost 20 pounds, their journey and visible transformation are what truly matter, regardless of the exact starting measurement.
Fit3D provides visual insights into how and where a person’s body is changing, allowing clients to see their progress clearly. The goal is not to fixate on initial numbers but to celebrate improvement and results.
Fit3D's Commitment to Refinement & Validation
Fit3D continuously refines and adjusts its algorithms based on ongoing research and user data. Our data is validated by millions of scans annually and through partnerships with research institutions.
In rare instances where a client’s expectations do not align with our measurements, this guide serves as a resource for setting proper expectations and navigating these conversations with confidence.
Due to the scale of our operations, we are not able to make custom prediction adjustments for a single facility, nor would we want to.
If you have any further questions or need assistance in addressing client concerns, our support team is always available to help! Simply email us at service@fit3d.com.