How to Measure Your Neck for a Dress Shirt
Get your collar size right the first time. The two-finger rule, exact tape placement, and a neck-to-shirt-size chart for men and women.
You buy a 16-inch dress shirt. You button it up. The collar squeezes your throat. You can't swallow without your tie popping loose.
Or you size up. Now the collar gaps. The tie sits crooked. The shirt looks like it was tailored for someone with a wider neck.
The fix is one measurement, taken once, in under 30 seconds. Most people skip it because they think they already know their neck size. They don't. Most men are off by half an inch. Most women have never measured at all.
This guide shows you the exact spot to place the tape, the two-finger rule that prevents the wrong reading, and a chart that maps your neck number to the right shirt size in both inches and centimeters.
Why Neck Size Is the Foundation of Dress Shirt Sizing
Almost every dress shirt size starts with the neck. A "16/34" shirt is a 16-inch neck with a 34-inch sleeve. A 39 cm European shirt is a 39 cm neck. The neck number is the anchor.
If the neck is wrong, the whole shirt is wrong. Too tight and you cannot button the top button without choking. Too loose and the collar fails its only structural job: holding the tie in place.
Three reasons neck size matters more than people realize.
Reason 1: Collars cannot be loosened
Reason 2: Cotton shrinks
Reason 3: Neck size sets the proportion
What You Need
- A soft fabric measuring tape.
- A mirror.
That is it. No friend required. The neck is one of the few measurements you can take alone with full accuracy.
If you don't own a tape, a piece of string and a ruler works. Wrap the string around your neck, mark the overlap, lay the string flat against the ruler.
Where to Place the Tape
The neck measurement is taken at the spot where your shirt collar will actually sit.
That spot is the base of your neck, just above your collarbone. Not your Adam's apple, which is too high. Not your shoulders, which is too low.
Here is how to find it:
- Tilt your chin down to your chest.
- Feel for the bony bump where your neck meets your back. That is the C7 vertebra.
- The tape should run horizontally around your neck at that level, going across your Adam's apple in front and the C7 bump in back.
The collar of a buttoned dress shirt sits exactly here
The Two-Finger Rule
The most important rule in neck measurement: leave room for two fingers between the tape and your skin.
Why two fingers and not zero?
A dress shirt collar is meant to be buttoned with a tie underneath. The collar plus the tie plus normal swelling during the day all eat space. If you measure your bare neck tight, the buttoned collar will choke you.
How to apply the rule
- Wrap the tape around your neck at the C7 level.
- Slide two fingers (index and middle, side by side) between the tape and your skin in front.
- Pull the tape until it contacts the back of your fingers.
- Read the number where the tape overlaps.
That is your neck size. The two fingers add roughly 0.5 inches of ease, which matches the buttoned-but-comfortable feel a good dress shirt has.
Round up if you're between half sizes
Step by Step: Measure Your Neck
Stand in front of a mirror
Chin level. Shoulders back. Wear no shirt or a thin t-shirt.
Find the C7 bump
At the back of your neck, where it meets your shoulders.
Wrap the tape around your neck
At C7 level. The tape should sit just above your collarbone in front, parallel to the floor.
Slide two fingers between the tape and your skin
Index and middle, side by side, in front.
Read and record
Write the number down in both inches and centimeters. Done.
Neck-to-Shirt-Size Chart — Men
Match your neck measurement to the standard men's dress shirt size. Most American and global brands use these labels.
| Neck Size | Neck (cm) | US Label | EU Label |
|---|---|---|---|
| 14" | 36 cm | 14 | 36 |
| 14.5" | 37 cm | 14.5 | 37 |
| 15" | 38 cm | 15 | 38 |
| 15.5" | 39 cm | 15.5 | 39 |
| 16" | 41 cm | 16 | 41 |
| 16.5" | 42 cm | 16.5 | 42 |
| 17" | 43 cm | 17 | 43 |
| 17.5" | 44 cm | 17.5 | 44 |
| 18" | 46 cm | 18 | 46 |
If your neck falls between two half sizes, round up. The half-inch ease saves you from the post-laundry shrink.
Neck-to-Blouse-Size Chart — Women
Women's blouses don't always list neck size, but for fitted button-downs and uniforms they do.
| Neck Size | Neck (cm) | Blouse Label |
|---|---|---|
| 13" | 33 cm | XS |
| 13.5" | 34 cm | S |
| 14" | 36 cm | M |
| 14.5" | 37 cm | L |
| 15" | 38 cm | XL |
| 15.5" | 39 cm | XXL |
For non-fitted blouses, neck size matters less. Pick by bust and shoulder width instead.
Five Mistakes That Wreck Your Neck Measurement
Measuring at the Adam's apple
Too high. Adds 0.5 to 1 inch to the real number.
Tape too tight
Skipping the two-finger rule guarantees a shirt that chokes you.
Tape too loose
Hanging slack around your neck inflates the number by half an inch easily.
Tape angled
A sloped tape reads longer than a horizontal one. Keep it parallel to the floor.
Measuring after a workout or a salty meal
Both swell the neck. Measure on a normal day, ideally morning.
Slim Fit vs. Regular Fit Collars
The neck measurement stays the same. The collar cut changes.
Regular fit dress shirts
Slim fit dress shirts
Athletic fit
Custom and made-to-measure
If you are buying slim fit and you are at the upper end of a half size (say 15.4 measuring 15.5), size up to 16. Slim fit collars run snug.
When the Collar Fits but the Rest of the Shirt Doesn't
Common problem. You measure 16 inches. You buy a size 16. The neck fits. The chest billows or the body is too tight.
The fix is not adjusting the neck size. The fix is buying from a brand that lists more dimensions per size, or moving to slim/athletic/relaxed fit lines from the same brand.
Right neck, wrong body
FAQs
Should I measure with the tape touching my skin or over a thin shirt?
Bare skin or over a very thin t-shirt. Anything thicker inflates the number.
My neck size is between two half sizes. Which do I pick?
Round up. Always. Cotton shrinks 1/4 to 1/2 inch in the first wash.
Why do European dress shirts use centimeters?
Standard European sizing. Use the cm column on the chart and ignore the inch number for European brands.
How often should I measure my neck?
Once a year, or after weight changes of 5 pounds or more. Neck size is sensitive to weight.
Do I need to measure my neck for casual button-downs?
Only if you plan to button the top button. For open-collar wear, neck size is less critical and you can pick by chest size.
Why two fingers and not one or three?
Two fingers add roughly 0.5 inches of ease, which matches the buttoned-but-comfortable feel a dress shirt has with a tie underneath. One finger gives a collar that chokes; three fingers gives one that gaps.
Save the Number
Add neck size to your phone note alongside the others:
- Neck
- Bust or chest
- Waist
- Hips
- Shoulder width
- Sleeve length, Method 1 (for dress shirts)
- Sleeve length, Method 2 (for jackets)
Eight numbers. Measured once. Reused forever. The next time you shop for a dress shirt online, you skip the size chart guesswork and pick the right size in 10 seconds. Stores running Tailor Size Guide let shoppers save these numbers and reuse them across every dress shirt and blouse in the store.
Selling dress shirts or formalwear on Shopify?
The neck measurement is the most common reason customers return shirts and never come back. Tailor Size Guide adds neck, sleeve, and full body measurement forms to your product page, then recommends the right size and fit before the customer hits buy.