Estimated body fat percentage using the US Navy circumference method.
The US Navy circumference method, which estimates body fat % from neck, waist (and hip, for women) measurements plus height — no scale or skinfold calipers needed.
The US Navy formula for women includes hip circumference in addition to waist and neck, because body fat distribution differs by sex; the men's formula only needs waist, neck and height.
The scale shown (Essential fat, Athletes, Fitness, Average, Obese) uses commonly cited body-fat percentage bands that differ for men and women — for example 6–13.9% is labeled Athletes for men vs 14–20.9% for women.