Affluent Fitness Tools

Body Composition Estimator

Estimate body composition metrics using body weight, body fat percentage, and optional circumference measurements. This is an educational planning tool, not a medical diagnostic device.

Enter Your Details

Sex

Age

Height (inches)

Weight (lb)

Activity Level Choose the option that best matches your typical weekly movement and training, not your single hardest day.

Body Fat % (recommended) Enter a known body fat percentage for a more useful estimate.

How do I choose my activity level?

Sedentary: Little to no structured exercise and mostly seated daily activity.

Lightly Active: Light exercise, walking, or recreational activity about one to two days per week.

Moderately Active: Consistent exercise about three to four days per week or a generally active lifestyle.

Highly Active: Hard training, physically demanding work, or higher-output activity about five to six days per week.

Athlete: Intense training, sport practice, or high-volume performance work most days of the week.

Add circumference measurements for more detail

These measurements are optional. They can improve estimated body fat and fat-distribution context, especially when you do not know your body fat percentage.

Waist (inches)

Neck (inches)

Hip (inches)

Thigh (inches)

Arm (inches)

Values are estimates generated from anthropometric models and user inputs. They are not medical measurements and should not be treated as diagnostic results.

Your Estimated Report

Fill out the form to generate your estimated body composition report.

Estimated Muscle Distribution

Regional Lean Mass Pattern

Male Pattern

Torso

Legs

Arms

Torso

—

Legs

—

Arms

—

Regional muscle distribution is an estimate based on body composition, circumference inputs, and activity level. It is intended for educational use only.

Comparative Context

Estimated Ranges

Body Fat %

Low Reference High

Skeletal Muscle %

Low Reference High

Body Water %

Low Reference High

Metabolic Age

—

Fat-Free Body Weight

—

Body Water %

—

Skeletal Muscle %

—

BMR

—

Body Fat %

—

Subcutaneous Fat %

—

Visceral Fat %

—

Muscle Mass

—

Bone Mass

—

Protein %

—

Fat Mass

—

How These Estimates Work

If you enter body fat percentage directly, the estimator uses it as the primary anchor for fat mass, fat-free mass, water, muscle, protein, and bone estimates. If you do not enter body fat percentage, the tool estimates it using optional circumference measurements or the primary anthropometric inputs. Visceral and subcutaneous fat values are modeled estimates, not direct scans.

This reflects the broader Affluent Fitness approach to evidence-based fitness: body composition is influenced by training, nutrition, recovery, hydration, and lifestyle together, not one isolated number.