Not sure what size shirt you should purchase?  Three measurements are needed to determine a shirt size, Chest, Sleeve Length and Neck Size.   With a tape measure and the help of a friend or family member and the following instructions you can obtain these three measurements.

It is important to remember that sizes may vary from one manufacturer to another and the style and cut may effect the fit of the garment.  You should also consider comfort.  Some people wear their clothes looser or tighter than others. 

Chest

Measure around the fullest part of your chest, keeping the tape under your arms and around your shoulder blades.  Keep the tape snug, not tight.  The number of inches is your Chest size.

Sleeve Length

Raise your arm level with your shoulder.  Start tape level with raised arm at the exact middle of the back at the neck between the shoulder blades.  From the middle of your back, around your elbow to one inch past your wrist joint.  The number of inches is your sleeve length. 

Neck Size

Measure around your neck at the point where the button on your shirt collar would be.

Men's Shirts Size Guide

Size     Chest        Neck           Sleeve

S            37-39      14-141/2       32-33

M           40-42      15-151/2        33-34

L            43-45      16-161/2        34-35

XL          46-48       17-171/2       35-36

XXL         49-51      18-191/2       36-37

XXXL       52-54      18-20            36-37