Men's shirt size chart: collar sizes in inches and cm, sleeve lengths and EU to US conversion

A men's shirt size chart turns a collar size into a number you can buy anywhere. A 16 in collar is 40.6 cm, and most brands label it 41 in Europe. Dress shirts add a sleeve length (16 34/35), and casual shirts swap both numbers for a letter, which is where brands stop agreeing.

Below are collar tables in inches and cm, European shirt sizes converted to US, letter sizes for six brands side by side, sleeve lengths, fits, and how to measure. The last part is for Shopify stores that sell shirts.

Men's shirt size chart: collar in inches and cm

US and UK shirts use the same collar number, the neck in inches. Europe and Japan use the neck in centimetres. The exact column is the inch size times 2.54. The EU column is the number brands print on the label.

Charles Tyrwhitt labels a 14 in collar as 35. Wikipedia and ASOS put 36 at the bottom of the range (ASOS writes it as 14.25 in). Charles Tyrwhitt does not sell a 15¾. Eton does, and Wikipedia pairs it with 40.

European shirt size to US

To convert a European shirt size to US, divide the cm by 2.54 and round to the nearest half inch. A 39 becomes 15.5, a 41 becomes 16 and a 43 becomes 17. The table above works in both directions, except at two points:

• 40 is 15¾, not 16. A 40 cm collar is 15.75 in, almost exactly 15¾. Brands that sell 40 (Seidensticker, for one) usually have a 41 next to it, so a 16 in shopper should take the 41.
• 45 and 46 depend on the source. Brooks Brothers, ASOS and Charles Tyrwhitt label an 18 in collar as 46. Wikipedia's table puts 18 in at 45 and 18.5 in at 46, one step lower than the brands. Wikipedia also lists 41 as 16¼ in.

Charles Tyrwhitt's newer formal shirt guide uses half centimetres for some sizes, so 15.5 in is 39.5, 16 in is 40.5 and 18 in is 45.5. If a shirt label shows a half number, it is that brand's own rounding, not a different size.

Is 41 medium or large? Letter sizes by brand

Casual shirts are often sold S to XXL, and each brand decides which collar goes with each letter. Here is what five brands publish in inches, with a sixth in cm below:

Seidensticker, a German shirt maker, sizes in cm only. XS is 35 or 36, S is 37 or 38, M is 39 or 40, L is 41 or 42, XL is 43 or 44 and XXL is 45 or 46. Its shirt size guide says the two collars in each letter share the same chest, waist and length.

So a 41 (16 in) is a large at Charles Tyrwhitt, Eton, Van Heusen and Seidensticker. ASOS is the outlier. Its M is a 16 in (41 cm) collar and its L is 17 in (43 cm). Brooks Brothers sits in between, with a 16 in neck at the top of its M and the bottom of its L. Van Heusen calls its XXL a 2X. Eton's numbers are the collar of the shirt itself, measured flat.

Our XS to XXL size chart shows the ASOS shirt table with chest sizes, so read it with this difference in mind.

EU XL size and other letters in cm

An EU XL shirt is a 43 or 44 cm collar at Seidensticker, which is a US 17 to 17.5. Charles Tyrwhitt's cm chart gives the same pair for XL, and Brooks Brothers labels its 17 and 17.5 collars as 43 and 44. If a European store only says XL, ask for the collar in cm or the chest of the shirt. For sweaters and T-shirts, where EU XL is a chest size, our clothing size conversion chart has the tables.

Sleeve length: 32/33, 34/35 and one-inch sizes

Charles Tyrwhitt and Eton both measure sleeve length from the centre back of the neck, over the shoulder, to the end of the cuff. That is why a sleeve size looks long next to an arm. Two systems exist:

• Paired sleeves. Van Heusen sells 32/33, 34/35 and 36/37. A 16 34/35 fits a 16 in neck and a 34 or 35 in sleeve.
• Single sleeves. Charles Tyrwhitt sells one-inch steps, such as a 16 in collar with a 34 in sleeve.

Casual shirts sold by letter come in one sleeve per size. On Charles Tyrwhitt's casual chart, S is 33 in (84 cm), M is 34, L is 35, XL is 36 and XXL is 37. Some European brands don't use these numbers at all. Seidensticker sells a "normal" sleeve of 65 to 67.5 cm, depending on fit and size, and an extra long one of 68 to 71 cm. That is about 26 in, far below any US sleeve size, so it can't be the same span and the table above won't convert it.

Slim, regular and classic fit

The collar stays the same across fits. The body changes, and fit names mean different things at each brand. Charles Tyrwhitt calls its Slim "our regular fit" and its Classic "our most generous fit". Here is what the names mean in inches, using Charles Tyrwhitt's newer formal shirt guide:

These are measurements of the shirt, not the body. All three Charles Tyrwhitt fits at 16 in are made for a body chest up to 42 in, and the brand warns that its fit "runs on the larger side". The Brooks Brothers rows come from its sport shirt guide (archived January 2026). Its archived dress shirt guide (linked in the note above) lists five fits, compared with the Regent regular fit. Soho is 5 in slimmer in the chest, Milano 2¾ in slimmer, Madison 2½ in fuller and Traditional 5 in fuller. Seidensticker has five fits too, from X-Slim to Comfort. Its size L chest runs from 118 cm in X-Slim to 128 cm in Comfort.

How to measure neck and sleeve

You need a soft tape measure. The neck step follows Charles Tyrwhitt's measuring guide.

1. Neck: put the tape flush around your neck where the collar sits, with two fingers between the tape and your neck.
2. Sleeve, part one: start at the centre back, just below the collar, and measure to the point of the shoulder.
3. Sleeve, part two: measure from the shoulder down to the elbow, then from the elbow to just above the wrist bone.
4. Add the sleeve numbers together. That total is your sleeve length.
5. Check a shirt you own. Eton measures a collar by laying it flat and going from the button to the end of the buttonhole. Do the same on a shirt that fits and compare.

Casual shirts vs dress shirts

A dress shirt is sold by collar and sleeve because it is worn buttoned, often with a tie, so half an inch at the neck matters. A casual shirt is usually worn open. Brands group two collars into one letter and give each letter one sleeve length, which is why the letter tables above differ more than the collar tables.

Some brands publish both. Eton's guide has a numbered chart for dress shirts and a letter chart for casual shirts. Charles Tyrwhitt sells formal shirts by collar and sleeve and casual shirts by letter. If you wear a 16 34 dress shirt, a casual L is your best first guess at most brands, and an M at ASOS.

For Shopify stores: shirt sizes that travel

We build Shopify apps, including a size chart app. This is what we would set up first in a store that sells shirts in more than one country.

Put both numbers in the variant

Shopify allows three options and 2,048 variants per product. A dress shirt can use one option for collar, one for sleeve and one for fit. For casual shirts, add the collar to the letter.

Say which letter system you use

If your supplier sizes like ASOS, a US shopper who wears a 16 L will order a size too big. One line next to the size picker ("Our M fits a 16 in collar") prevents that return. If you are building a chart from your own samples, our guide on how to make a size chart covers measuring and grading.

Plainfee Size ChartsSize charts that show every shopper their own country's sizes, with how-to-measure steps in 31 languages.See how it works

Plainfee Size Charts, our Shopify size chart app, has been on the Shopify App Store since 23 October 2026. It has a ready-made men's shirts chart with letter, collar in inches and collar in cm. Its collar columns are tied to countries (inches for the US and UK, cm for Europe), so each shopper sees their own country's column first (the app covers 44 countries), and with Find your size a shopper can pick the collar they usually wear, such as 41, to light up the matching row. A per-product fit note ("Slim fit, size up if between collars") sits above the chart. The free plan covers 3 live charts, and Pro is a flat $14.99 a month with no fees per order. Kiwi Size Chart has a fit recommender, which we do not offer; our comparison of Shopify size chart apps covers both. To place the chart in your theme, see the size guide setup steps.

A quick checklist before you publish

• Every shirt shows the collar in inches and cm, not only a letter.
• The chart says which letter goes with each collar in your range.
• Dress shirts list the sleeve length, and say whether it is paired (34/35) or single.
• Fit names come with chest and waist numbers.
• The chart says whether numbers are body or garment measurements.
• Measuring steps for neck and sleeve sit next to the size picker.
• You checked the chart on a phone.

A collar size is the one shirt number that means the same thing in every country, give or take a centimetre of rounding. Put it next to every letter you sell, and European and US shoppers end up ordering the same shirt.

Frequently asked questions