Question 1

Which method is more accurate — Navy or BMI?

Accepted Answer

The US Navy method is generally more accurate than the BMI-based formula because it uses actual body measurements rather than just height and weight. BMI doesn't distinguish between muscle and fat — a muscular person can have a 'high' BMI but low body fat. For most people, the Navy method is within 3–4% of DEXA scan results. For true accuracy, a DEXA scan or hydrostatic weighing test remains the gold standard.

Question 2

How do I measure correctly for the Navy method?

Accepted Answer

Neck: measure at the narrowest point, below the larynx. Waist (men): measure at the narrowest point, usually at the navel. Waist (women): measure at the narrowest point of the torso. Hip (women only): measure at the widest point of the hips and buttocks. Use a flexible tape measure and measure to the nearest 0.5 cm. Take measurements in the morning before eating, and measure each point twice to confirm.

Question 3

What is a healthy body fat percentage?

Accepted Answer

Healthy ranges vary by sex and age. For men, 10–20% is generally considered healthy for ages 20–39, rising slightly with age. For women, 18–28% is typically healthy for ages 20–39. Athletes often sit at 6–13% (men) or 14–20% (women). Essential fat (the minimum needed for organ function) is 2–5% for men and 10–13% for women — going below these levels is dangerous.

Question 4

Is body fat percentage better than BMI?

Accepted Answer

Body fat percentage is a more meaningful health metric than BMI because it measures body composition directly. Two people can have identical BMIs but very different body compositions — a fit person with high muscle mass and a sedentary person with high fat mass might have the same BMI. That said, BMI is still a useful population-level screening tool. For personal health decisions, body fat percentage combined with waist circumference gives a much clearer picture.

Question 5

How can I lower my body fat percentage?

Accepted Answer

Reducing body fat requires a sustained caloric deficit combined with resistance training to preserve muscle mass. Aim to lose 0.5–1% of bodyweight per week — faster loss risks muscle loss. High-protein diets (1.6–2.2g per kg of bodyweight) help maintain muscle during a cut. Cardio accelerates the deficit but resistance training is essential for body composition. Consistency over months matters far more than any specific diet or exercise approach.

Category	Men	Women
Essential fat	2–5%	10–13%
Athlete	6–13%	14–20%
Fitness	14–17%	21–24%
Average	18–24%	25–31%
Obese	25%+	32%+

Body Fat Percentage Calculator

Body fat percentage vs BMI

Reference ranges by sex

Frequently asked questions