SkinfoldCalculator

Skinfold Calculator – Body Density and Body Fat Estimation
Skinfold Calculator is a simple and practical iOS app that estimates body density and body fat percentage from skinfold thickness measurements obtained using a skinfold caliper.
The app is designed for coaches, athletes, sports science professionals, and students studying exercise physiology and body composition assessment.

Key Features
■ Two Body Density Prediction Equations
Choose between the Nagamine–Suzuki two-site equation and the Jackson–Pollock three-site equation.
The app automatically displays the required measurement sites based on the selected equation and sex.

■ Two Body Fat Conversion Equations
Estimate body fat percentage using either the Siri or Brožek equation based on predicted body density.
By selecting the body density prediction and body fat conversion equations separately, users can better understand the differences between estimation methods.

■ Estimated Fat Mass and Fat-Free Mass
Enter body weight to calculate estimated fat mass and fat-free mass based on the estimated body fat percentage.

■ Save and Share Results
Save your calculated results as an image and share them with athletes, coaches, or teammates.

■ Automatic Settings Storage
Measurement values, selected equations, and other preferences are stored locally on your device for future use.

■ Japanese and English Support
Switch between Japanese and English within the app.

Important Information
Body density and body fat percentage calculated by this app are estimates derived from skinfold thickness measurements.
Results may vary depending on the prediction equations, age, individual physical characteristics, measurement sites, and measurement techniques.
For longitudinal body composition monitoring, consistent measurement procedures and estimation equations are recommended.
This app is not intended for medical diagnosis.

About the Developer

This app was independently developed by a faculty member affiliated with the Faculty of Sports and Health Sciences and the Wellness & Sports Science Center at Fukui University of Technology, Japan, drawing on expertise in sports science and exercise physiology.

Skinfold Calculator is an independently developed application and is not an official app of the university.