Body Fat Calculator (PRO) - パソコン用

# Scientific Body Fat Calculator The most comprehensive body fat calculation tool implementing research-validated formulas including Jackson & Pollock (3-site, 4-site, 7-site), Durnin & Womersley, YMCA, Modified YMCA, U.S. Navy, Parillo, and Covert Bailey methods. ## Calculation Methods & Accuracy ### Free Methods **YMCA Method** (±5-7% accuracy) - Simple method using weight and waist measurements - Higher margin of error due to minimal measurements - Best for tracking personal trends rather than absolute values - Less accurate for athletic or non-standard body types **Modified YMCA** (±4-6% accuracy) - Enhanced version with additional measurements for women - Improved accuracy over basic YMCA - More reliable for women due to gender-specific calculations - Still affected by non-standard fat distribution **U.S. Navy Method** (±4-6% accuracy) - Military standard using key body measurements - Most accurate for individuals near population averages - Less reliable for very lean (under 8%) or obese (over 30%) individuals - Accuracy depends heavily on measurement technique ### PRO Methods (One-Time Purchase) **Covert Bailey** (±4-5% accuracy) - Comprehensive method with multiple measurements - Age and gender-specific calculations - More reliable across different body types - Requires precise measurement technique **Durnin & Womersley** (±3.5-5% accuracy) - Scientific skinfold method - Age and gender-specific equations - Accuracy heavily dependent on technician skill - Requires proper caliper technique and calibration **Jackson & Pollock Methods** - 3-Site (±4-5% accuracy) - 4-Site (±3.5-4.5% accuracy) - 7-Site (±3-4% accuracy) - Industry standard for skinfold measurements - Accuracy improves with more measurement sites - Requires significant technical expertise **Parillo 9-Site** (±3-4% accuracy) - Bodybuilding-focused nine-site method - Most comprehensive skinfold method - Requires significant expertise and consistent technique - Best for tracking changes in trained individuals ## Measurement Tools & Techniques ### Skinfold Caliper Methods Compatible with major caliper brands including: - Harpenden - Lange - Slim Guide - Accu-Measure - FatTrack - Lafayette - Beta Technology - Bozeera Accuracy: ±3-4% when performed correctly ### Circumference Methods Using standard anthropometric tape measures: - Gulick II - MyoTape - Seca - AccuFitness Accuracy: ±4-6% with proper technique ### Measurement Sites - Triceps - Biceps - Subscapular - Suprailiac - Chest - Midaxillary - Abdominal - Thigh - Calf ## PRO Features & Benefits - Access all scientific calculation methods - Enhanced measurement precision (2 decimal places) - Family Sharing enabled (share with up to 5 family members) - Works offline - no internet required - One-time purchase (no subscriptions) ## Key Features - Multiple calculation methods - Metric/Imperial unit conversion - Research-based accuracy ratings ## Professional Applications Perfect for: - Exercise Physiology Research - Sports Performance Testing - Clinical Assessment - Fitness Progress Tracking - Body Composition Studies - Athletic Performance Monitoring - Nutritional Assessment - Health Risk Evaluation ## Technical Specifications - Measurement precision to 1mm - Peer-reviewed formula implementations - Population-specific equations - Age and gender-adjusted calculations Trusted by researchers, sports scientists, and fitness professionals worldwide for accurate body composition assessment. **Note:** All accuracy ranges assume proper measurement technique and calibrated tools. Individual results may vary based on body type, hydration levels, and measurement skill.