Enter the Neck Circumference and Height into the calculator to determine the Neck Index. This calculator can also evaluate any of the variables given the others are known.

Neck Index Formula

The following formula is used to calculate the Neck Index.

NI = (NC / HC) * 100


  • NI is the Neck Index (%)
  • NC is the Neck Circumference (cm)
  • HC is the Height (cm)

To calculate the Neck Index, divide the Neck Circumference by the Height, then multiply the result by 100. This will give you the Neck Index in percentage.

What is a Neck Index?

A Neck Index is a measurement used in medical and health-related studies to assess obesity and fat distribution in the body. It is calculated by measuring the circumference of a person’s neck. A higher Neck Index is often associated with a higher amount of body fat and can be an indicator of health risks such as sleep apnea, cardiovascular disease, and metabolic syndrome.