#1501 · Health Tool

Workout Body Fat Calculator

Estimate your workout body fat percentage, fat mass, lean body mass, and goal gap with a decision-focused body composition calculator built for fat loss, maintenance, or muscle gain planning.

Calculator

Health inputs
in
lb
in
in
in
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How to use this calculator

Enter height, weight, waist, neck, and gender. Female users should also enter hip measurement. Select your goal to compare your estimate with a practical body-composition target.

What the result means

The result estimates body fat percentage and separates total weight into fat mass and lean mass. Use it to judge whether the next priority should be fat loss, maintenance, or lean-mass preservation.

Male: 86.010 × log10(waist − neck) − 70.041 × log10(height) + 36.76. Female: 163.205 × log10(waist + hip − neck) − 97.684 × log10(height) − 78.387.

This is an estimate, not a medical scan. Hydration, measurement technique, and body shape can change the result.

Example calculation

A 180 lb male at 70 in height, 36 in waist, and 15 in neck is estimated near 23% body fat, with about 41 lb of fat mass and 139 lb of lean mass.

Tips for better results

  • Measure waist and neck at the same time of day.
  • Track weekly trends rather than one reading.
  • Pair a calorie deficit with resistance training.
  • Use protein intake to reduce lean-mass loss risk.

FAQ

How much body fat should I lose to see abs?

Most men need to approach roughly 10–15% body fat and many women roughly 18–23%, but individual muscle mass and fat distribution change visual results.

What is a healthy body fat percentage for men who lift weights?

Many active men target about 10–20% depending on performance, appearance, and sustainability goals.

What body fat percentage is recommended for women doing strength training?

Many active women target about 18–28%, with lower ranges requiring careful recovery, nutrition, and hormonal health awareness.

How long does it take to reduce body fat with workouts?

A sustainable pace is usually about 0.25–0.75 kg or 0.5–1.5 lb per week when nutrition and training are consistent.

Can I lose body fat without losing muscle mass?

Yes, but the plan usually needs resistance training, adequate protein, moderate calorie deficit, and sufficient sleep.

Decision modules

ModuleOutput
Body fat estimateMain result percentage
Lean mass preservationFat mass versus lean mass split
Goal gapDistance from target body fat
Risk indicatorMuscle-loss or high-fat-risk status

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