Navy circumference formula
US Department of Defense body fat equation. Used by 1.3M service members since 1984. ±3-4% accuracy versus DEXA in published studies.
Hodgdon & Beckett (1984)
EVERY MORNING
Your body,
Your body,
measured.
One photo a day. Tare reads body fat, muscle balance, and posture using the Navy method calibrated against visual AI — with a confidence band that shows you what's signal and what's noise.
Navy method · ±3% band
Photos stay private
No medical claims
HOW IT WORKS
Thirty seconds.
Thirty seconds.
Honest math.
01
Capture
Stand back, neutral pose, phone at chest height. One photo. The app handles the framing.
02
Measure
Vision AI estimates your circumferences against your stated height. Navy formula reconciles against the visual read.
03
See
Most days you'll see nothing — that's honest. On the days that matter, you'll see it clearly, with a trajectory we'd stake our methodology on.
ACTUAL SCIENCE
Three validated methods.
Three validated methods.
Reconciled.
Visual body composition AI
Multi-view smartphone photo analysis. Modern vision models reach ±3-5% accuracy on body fat % when calibrated against DEXA-labeled training data.
Majmudar et al. (2022)Anthropometric ratios
Waist-to-height is the strongest single predictor of cardiometabolic risk, outperforming BMI in 31 of 31 published comparisons.
Ashwell (2012)We do not claim DEXA-level accuracy. Every reading is reported with a confidence band that widens when our methods disagree. We never generate a fake "future you" image — the trajectory chart is a real regression on your logged data.
PRICING
Pay for clarity.
Weekly
$9.99/wk
Try it for the cost of two coffees.
BEST VALUE
Annual
$79.99/yr
$1.54/wk. 7-day free trial. Cancel anytime.
Lifetime
$199one-time
Own it. No recurring charge, ever.
SHIPPING SOON
Be the first to know.
Tare is in private beta. Drop your email and we'll send you a TestFlight invite when we open the next cohort.