Neck Circumference Risk Calculator

Work out neck circumference risk instantly with clear inputs, formula shown and shareable results.

About Neck Circumference Risk Calculator

Neck circumference reflects upper-body fat and is a recognised screening marker for obstructive sleep apnoea as well as metabolic risk. The usual thresholds are 40 cm for men and 35 cm for women, and clinical scoring adds about 4 cm when BMI exceeds 30. A 41 cm neck sits above the male threshold.

Formulas

Thresholds

40 cm for men, 35 cm for women

Adjusted neck circumference

add about 4 cm when BMI is 30 or above

Worked example

With the default values below, Neck Circumference Risk Calculator returns Neck Circumference of 41.0. Change any input above and every figure here is recalculated in your browser.

Inputs used

Neck circumferenceminimum 20 cm: 41 cm
Sexone of Male, Female: Male
Body mass indexaccepts 10–70 kg/m2: 28 kg/m2

Results

Neck Circumference: 41.0 cm
Risk Interpretation: Raised risk - worth discussing with a clinician
Raised-Risk Threshold: 40 cm
BMI-Adjusted Neck Score: 41.0 cm

Step by step

1Values used
2Thresholds
3Adjusted neck circumference
4Neck Circumference= 41.0 cm
5Risk Interpretation= Raised risk - worth discussing with a clinician
6Raised-Risk Threshold= 40 cm
7BMI-Adjusted Neck Score= 41.0 cm

Assumptions and limits

The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
These figures are population-average estimates, not a medical assessment or diagnosis. Body composition equations carry errors of several percentage points, and healthy ranges vary with age, ethnicity, muscularity and medical history. Discuss weight or body composition goals with a qualified clinician or dietitian.
This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

These figures are population-average estimates, not a medical assessment or diagnosis. Body composition equations carry errors of several percentage points, and healthy ranges vary with age, ethnicity, muscularity and medical history. Discuss weight or body composition goals with a qualified clinician or dietitian.

Frequently Asked Questions

Why does neck size predict sleep apnoea?

Because fat deposited around the pharynx narrows the airway, making collapse during sleep more likely.

Does a thick neck from training count?

Muscular necks raise the measurement without the airway narrowing, so the marker is less useful for trained athletes.