Collar Size Calculator - Calculator Academy

Enter the collar size, neck circumference, and ease allowance into the calculator to determine the missing variable.

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Collar Size Formula

The following formula is used to calculate the collar size for a given neck circumference and ease allowance.

C = N + E

Variables:

C is the collar size
N is the neck circumference
E is the ease allowance (often about ½ inch / 1.27 cm for men’s dress shirts; commonly in the range of about ¼ to ½ inch depending on fit)

What is a Collar Size?

Collar size refers to the measurement around the base of the neck, where the collar of a shirt would naturally sit. This measurement is crucial for ensuring a comfortable fit, especially for dress shirts and formal wear. A properly measured collar size ensures that the shirt fits well around the neck without being too tight or too loose. The collar size is typically measured in inches or centimeters and is an essential aspect of tailoring and clothing design.

How to Calculate Collar Size?

The following steps outline how to calculate the Collar Size.

First, measure the neck circumference (N).
Next, choose an ease allowance (E) based on how snug or relaxed you want the collar to feel.
Next, make sure N and E are in the same units (inches or centimeters).
Next, calculate the collar size using the formula C = N + E.
After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem :

Use the following variables as an example problem to test your knowledge.

Neck Circumference (N) = 40 cm

Ease Allowance (E) = 1.27 cm

Collar Size (C) = N + E = 40 cm + 1.27 cm = 41.27 cm