Army Body Fat Calculator
Calculate macronutrient ratios and daily targets for protein, carbohydrates, and fats.
Personal Information
Body Measurements
Body Fat Percentage
Meets Army Standards
Army Max Allowed
male age 25
Fitness Category
General classification
Standards Compliance
Meets Army standards
How it works
The Army Body Fat Calculator estimates body-fat percentage from tape measurements, the method the U.S. Army uses for its body composition standard. For men it uses the waist and neck; for women, the waist, neck, and hips — plus height.
Army (circumference) method, men
%BF = 86.010·log₁₀(waist − neck) − 70.041·log₁₀(height) + 36.76
- waist
- abdominal circumference (women also use hips)
- neck
- neck circumference
- height
- standing height (same units)
Worked example
- Man, height 70 in
- Waist 34 in, neck 16 in
- log₁₀(34 − 16) = log₁₀(18) ≈ 1.255
Body fat ≈ 15% — within the Army standard for most age groups.
Good to know
- Army max body-fat limits scale with age and sex; passing the tape test is required if you exceed the weight-for-height screen.
- Measure relaxed and at the right landmarks — small tape errors swing the result a few points.
- It's an estimate; DEXA and hydrostatic weighing are more accurate but far less practical.
Related Calculators
Frequently Asked Questions
What are good macro ratios for weight loss?
Higher protein (25-35%), moderate carbs (30-40%), moderate fat (25-35%). Protein helps preserve muscle during weight loss and increases satiety.
How much protein do I need daily?
Active individuals need 0.8-1.2g per pound of body weight. Strength athletes may benefit from 1.2-1.6g per pound for muscle building and recovery.
Should I track macros or just calories?
Start with calories for weight management, then add macro tracking for body composition goals. Protein is the most important macro to track consistently.
How often should I exercise?
The WHO recommends at least 150 minutes of moderate-intensity or 75 minutes of vigorous-intensity aerobic activity per week.
What is a balanced diet?
A balanced diet includes variety from all food groups: fruits, vegetables, whole grains, lean proteins, and healthy fats.
How much water should I drink?
General recommendation is 8-10 glasses (2-2.5 liters) per day, adjusted for activity level and climate.
How important is sleep?
Sleep is crucial for physical recovery, mental health, and overall wellbeing. Adults need 7-9 hours nightly.