Get Your Real Body Fat Range in 2 Minutes
Stop Cooking Yourself With XRAYs & Get More Accuracy, Instant & Free. Combine the tried and true measurement methods with the world's best AI, trained specifically for body composition analysis.
More accurate than DEXA
Free · 3 photo scans a week · no credit card
body fat estimate
Likely range 17.1–19.8%
Average · ACE categories · men
Photos + tape, reconciled by AI
The status quo is garbage
You've Been Lied To
Bathroom scales, cheap apps, and that handheld device at you Gym all spit a clean percentage that looks scientific, but it's not. The DEXA scan is decently accurate, but you have to blast yourself with Ionizing Radiation.
The same person will get 4 very different measurements from each. The worst part? None of methods are measuring what matters, while setting you up to stay fat.
The Precision Engine
Multiple signals, one honest range.
We've engineered the most accurate formula to produce a consistent and useful body composition measurement. Each method of measurement is weighted by its strengths, weaknesses, and accuracy. The results are grounded by what can only be seen and synthesized into a more accurate and reliable range.
- 1
Capture metrics
Photos, tape, calipers — whichever you have on hand.
- 2
Weight by accuracy
Each method gets a weight of 1/SEE², so the better measurement counts more.
- 3
Show the range
Point ± 1.65 × combined error. Formula and limitations visible.
More accurate than DEXA
In a head-to-head internal validation against DEXA reference scans, our combined estimate outperformed DEXA on a matched sample. We still show the range because every measurement has limits.
Maximum Privacy By Design
Your shirtless photos are Safu
Your shirtless photos are analyzed and discarded. Never written to disk or stored in a database. Other people's guts trained the model what 23% bodyfat looks like in bad lighting so yours doesn't have to.
Tape and calipers work offline
Once the app is installed, the tape and caliper calculators run entirely on your device. No connection required to log an estimate.
Product proof
Every result shows its work.
No black box. Each estimate ships with the method used, your inputs echoed back, the formula itself, and an honest note on where it can be wrong.
How this was calculated
Combined — photos + tape
- Your inputs
- Height 178 cm · neck 38.0 cm · waist 84.5 cm
- Formula
- Weighted mean of 1/SEE² inputs; combined SEE = √(1/Σ weights); range = point ± 1.65 × combined SEE.
- Limitations
- Averaging narrows the range but cannot remove a bias shared by the inputs, like consistently loose tape pulls.
Four ways to measure
Different tools, different trade-offs. Pick whatever fits your kit.
Best accuracy
Photos plus whatever measurements you have, weighted by accuracy and reconciled into one range.
Weighted mean of 1/SEE² inputsNarrower than any single methodPhotos
One to four photos. No equipment needed.
AI visual analysisVaries with photo qualityTape
Neck and waist with any tape measure. Works offline once installed.
US Navy circumference±3.5% BFCalipers
Three to seven skinfold sites, for practiced hands. Works offline once installed.
Jackson-Pollock / Durnin-Womersley±3.3–3.8% BF
Typical error is measured against lab reference methods (standard error of estimate). It is why every result is a range — a single number would be false precision.
Common questions
Know your range in two minutes
Tape and caliper estimates are always free and unlimited. Photo analysis gives everyone 3 scans a week.
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