Fat Loss App
Get Lean & Shredded With No More Guesswork
The one problem that’s kept everyone from having a 6pack..
The one not even GLP-1s like Ozempic and Retatrutide could fix:
Is no longer an issue.
That’s right. Ab veins are now a scientific, plug and play formula away.
BodyFatCalc combines four measurement methods and shows the honest range. Every Paid BowTied Biohacker member gets free access.
Your bathroom scale can move after one salty dinner and still pretend it diagnosed your body composition.
Your mirror gets bullied by lighting, sodium, glycogen and whatever angle makes you feel least cooked that morning.
You want to know whether the cut is working before you waste another month. You want to take your shirt off without needing a flattering light source and a congressional inquiry.
The problem is the a lack of a widely available, ACCURATE, bodyfat percentage measurement without having to blast yourself with Xrays at a $200 DEXA scan every time you want to check your progress.
That’s why we built BodyFatCalc to give you a useful answer. You’ll get the most accurate body fat range and the method behind it.
BodyFatCalc is free for every paid tier substack member.
Use the same email address for your subscription and your BodyFatCalc account. That email is the key.
Not a Member Yet? Subscribe and Get Body Fat Calc FREE!
Your dashboard keeps the current range, goal, scan allowance, recent estimates, and trend one tap away.
The Four Method Measurement Stack kills fake precision.
BodyFatCalc gives you four ways to measure.
Photos analyzes front and side images when you want the fastest visual estimate.
Tape uses the Navy method, works offline and takes about two minutes.
Calipers guides you through the correct skinfold sites, works offline and keeps the math on your device.
Best Accuracy combines photos with any measurements you enter, then reconciles the signals with AI.
Best Accuracy is the flagship because more signal beats one measurement technique with its own unique flaws.
The algorithmic range is the answer.
Choose Best Accuracy, Photos, Tape, or Calipers without leaving the app.
Every result shows its work.
Most AI body fat apps give you an AI slopped estimate and charge you for it.
BodyFatCalc gives you the truth.
Every saved result shows the method, your estimate and the likely range. The same screen exposes the typical error, inputs, formula and limitations.
You also get FFMI with a range and estimated fat free mass. Category context, saved history and trend charts finish the job.
That matters because the trend will tell you in real time, how to calibrate your diet and activity to get shredded.
If your body fat range moves down across several consistent check ins while your strength and FFMI hold, the cut is doing its job.
No More Guesswork Required!!!
Your shirtless photos are safu.
The app analyzes your photos and discards them.
They are never written to disk. They are never stored in the database.
Other people’s guts trained the model what body fat looks like in bad lighting, so yours can be discarded after the estimate.
Members get three photo scans during each rolling weekly window. Tape and caliper estimates stay available without a photo scan, and both methods work offline after the app is installed.
That scan limit keeps the expensive AI available to the whole membership instead of letting one man run 97 bathroom lighting experiments before lunch.
Your progress stops hiding in bad lighting.
The first estimate gives you a baseline.
The next few estimates give you a pattern.
BodyFatCalc saves each result and plots the range. It compares the change and keeps your goal in view.
The trend view shows the current estimate, average, change, entry count, range, and goal.
Members get the whole app free.
Every paid tier BowTied Biohacker member gets BodyFatCalc at no extra cost.
Follow this exact sequence:
Visit BodyFatCalc.
Create your account with the email attached to your BowTied Biohacker subscription.
Choose Best Accuracy, Photos, Tape, or Calipers.
Log under repeatable conditions.
Watch the trend instead of negotiating with the mirror.
If you are not a member yet, subscribe first at bowtiedbiohacker.com, then create the app account with that same email.
We built the body fat app we wanted to use.
You get four methods with an honest range. You also get transparent math, private photo handling, FFMI, history and trends.
Our combined method beat DEXA in an internal head-to-head validation. We still show the range because every measurement has limits, including ours.
That combination of ambition and honesty is the whole product.
The world’s best AI body fat measurement app is now free for every BowTied Biohacker member.
Use your subscription email. Measure once. Log the trend. Stop letting a $39 smart scale gaslight you on your cut.