iPhone · Free app · Version 1.3
Estimate from three sites.
Track changes over time.
Use the Jackson–Pollock three-site method to estimate body fat percentage. One valid reading per site is enough; add repeat readings to compare consistency, switch between millimeters and inches, and optionally add the final estimate to Apple Health.
Skinfold 1.3
Flexible measurements with clearer consistency checks
- Three-site estimate
Sex-specific measurement sites - One reading is enough
Add a second or third to compare consistency - Millimeters or inches
Switch units without changing the formula - Optional Apple Health write
Add only the final body fat estimate - History and trends
Compare recent records for the same sex - Three languages
Simplified Chinese, English, and Japanese
Privacy first
No account, and no measurement data sent to the developer
- No account
Open the app and start - No ads or analytics
No tracking or usage profiling - Local history
Delete one record or clear them all - Write-only Health access
User-initiated and never reads HealthKit data
Important
The app provides an estimate based on the values you enter. It is intended only for general fitness and personal tracking and is not medical advice, diagnosis, or treatment. Measurement technique, individual differences, and input errors can affect the result.