Your personal body fat expert! From simple measurements to pro-level skinfold analysis. Science-backed accuracy for all fitness levels.

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.