Body fat from one photo — analyzed once, then deleted. Here's how I built it.
I kept wanting a number between "guess in the mirror" and "book a $150 DEXA scan." Calipers need a second person and a steady hand. Smart scales swing a few points depending on how much water you drank. So I built realbodyfat.com : upload one full-body photo, get body fat %, lean mass and fat mass in about ten seconds. The constraint that shaped the whole thing: the photo is analyzed once and…
Realbodyfat.com offers a simple solution to guess body fat percentage from a single photo. Users upload a full-body image, and the website provides body fat, lean mass, and fat mass percentages. The photo is analyzed once and then discarded, with no user accounts or stored data. The service uses a stack of Astro on Cloudflare Workers, with a single React component handling the scan flow.
Credits are used for multiple scans and are purchased via a one-time purchase. The website warns that the estimate is not a measurement, and compares to the Navy tape method for accuracy. It is recommended to pick one method and track trends over time. The author suggests redesigning the credit system first, as it was the most challenging part. The website can be accessed at https://realbodyfat.com/.
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