Let us calculate body fat for a 30-year-old male who is 178 cm tall, with a waist of 86 cm and a neck circumference of 38 cm.
Step 1: Enter height = 178 cm, waist = 86 cm, neck = 38 cm, gender = male.
Step 2: The calculator applies the Navy formula: BF% = 495 / (1.0324 - 0.19077 x log10(86 - 38) + 0.15456 x log10(178)) - 450.
Step 3: Result shows approximately 18.2% body fat, which falls in the Average category for men.
This means roughly 14.5 kg of this person's 80 kg body weight is fat, and 65.5 kg is lean mass. To reach the Fitness category (14-17%), he would need to reduce body fat by about 1-4 percentage points through diet and exercise.