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How Accurate is Fitycal’s 3D Body Scan? A Deep Dive into Smartphone-Based Precision

Updated: Mar 5



Introduction: Can You Really Trust a Phone Camera for Body Measurements?


In an era where technology is revolutionizing health and fitness, the idea of using a smartphone to perform a 3D body scan may raise some eyebrows. Traditional measurement tools like calipers, measuring tapes, and even advanced DEXA scans have been the gold standard for body composition analysis. So how does Fitycal, powered by Prism Labs’ technology, measure up against these methods? Let’s break down the science behind its accuracy and the research supporting it.



How Accurate is Fitycal Compared to Traditional Methods?


To evaluate accuracy, we need to look at two factors: precision (how consistent the scans are when repeated under the same conditions) and accuracy (how closely the scans match a known standard, like DEXA scans).



Body Fat Percentage Accuracy


Fitycal’s body fat estimation is benchmarked against DEXA scans, widely regarded as the most precise method for body composition analysis. A study using 131 individuals of diverse body types compared Prism’s 3D scan results with DEXA measurements. The findings revealed:


  • Precision: When scanning the same person multiple times under the same conditions, the variation in body fat percentage is as low as 0.5%.

  • Accuracy: The absolute median error in body fat percentage estimation compared to DEXA scans is 3.5%.

  • Comparison to BIA: Bioelectrical Impedance Analysis (BIA) devices rely on electrical impulses and can be affected by hydration levels. Unlike BIA, 3D scanning does not depend on electrical conductivity, making it less sensitive to short-term fluctuations like water intake.



Body Circumference Accuracy


Circumference measurements are crucial for tracking progress, especially for fitness and weight loss. Here’s how Fitycal performs:


  • Precision: When scanning the same person multiple times under the same conditions, body circumferences vary on average by only 0.5 cm. This level of consistency even outperforms certain non-portable 3D body scanning booths.

  • Accuracy: When compared to measurements taken using a depth camera-based 3D body scanner, the absolute median error rate for body circumferences is 2.2%.



How Does Fitycal Handle Real-World Variables?


Concerns about smartphone-based scanning often involve factors like lighting, posture, and body shape variations. Here’s how Fitycal’s technology manages these variables:


  • Lighting Conditions: During the selection phase of the technology, tests were conducted under different lighting conditions, and the results remained robust.

  • Posture Variations: While posture plays a role in any scanning method, the algorithm accounts for minor posture variations to ensure consistent results.

  • Body Type Inclusivity: The study included individuals aged 18 to 76 years, with heights between 151.5 cm – 194.9 cm, weights between 42 kg – 168.9 kg, and body fat percentages ranging from 10.6% – 54.7%. Additionally, the technology itself was developed using a significantly larger dataset beyond these 131 scans.


Is There Scientific Validation Behind Fitycal’s Accuracy?


Scientific validation is key when evaluating body measurement technology. Two studies, one from the University of Texas and another published in the European Journal of Clinical Nutrition (EJCN), support the accuracy of this 3D scanning approach. These studies confirm that:

  • The smartphone-based 3D scan closely aligns with DEXA scan results.

  • The technology maintains a low error margin in body composition estimations.

  • The method provides a valid alternative to traditional body measurement techniques.


For a detailed look at the research, check out these peer-reviewed studies:



Should You Trust a Smartphone-Based 3D Scan?


The short answer: Yes. 


Fitycal’s 3D scanning technology delivers a highly precise and accurate body measurement solution that rivals traditional methods. While DEXA scans remain the gold standard in clinical settings, smartphone-based scanning offers a practical, accessible, and non-invasive alternative for everyday users and fitness professionals.


What’s Next?


If you’ve been hesitant about trying 3D body scanning, now is the perfect time to see the results for yourself. Download Fitycal and explore its accuracy with a free two-week trial.

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