Men's dress shirt size chart

A men's dress shirt is sized by two body measurements, in inches: neck circumference and sleeve length. A label that reads 16 34/35 means a 16-inch collar and a sleeve built for an arm measuring 34 to 35 inches. The S/M/L letters some brands print on dress shirts are approximations layered on top of that system — which is why a "large" varies by brand while a 16.5 collar does not. The men's dress shirt size chart below maps every neck size to centimeters, EU collar sizes, and its usual letter equivalent, then covers what the grid cannot: cut, ease, and how to measure.

Most dress-shirt sizing frustration comes from one of two mistakes: reading the two numbers wrong, or assuming the two numbers describe the whole shirt. They fix your collar and your cuff — nothing else. Everything between them, chest to waist to armhole, is decided by the cut, which the size does not encode. Both halves are covered below. The other sizing languages — letters, women's numerics, international codes — each get their own chart on the size charts shelf.

The first number is the collar: the circumference of the neckband in inches, measured with the collar buttoned, from the center of the buttonhole to the center of the button. It moves in half-inch steps — 15, 15.5, 16 — because the collar sits directly against your neck, and half an inch there is the difference between comfortable and strangled.

The second number is the sleeve: the distance in inches from the center back of the neck, over the shoulder point, down to the wrist bone. It is a longer, more forgiving path, so it moves in one-inch steps — and most off-the-rack shirts compress it further into two-inch split sizes: 32/33, 34/35, 36/37. A 34/35 shirt has one physical sleeve, cut to a compromise length; two buttons on the cuff let you tighten it so the cuff sits at the wrist whether your true measurement is 34 or 35. Shirts sold in exact sleeve lengths — a 34 and a separate 35 — remove that compromise, which is one of the quiet things a more expensive shirt is charging you for.

So 16 34/35 is not a style code or a lot number. It is your neck and your arm, in inches, printed on the collar. For the same decoding applied to every other label format on the rack — a lone M, a 40 regular, an EU 41 — see what your shirt size means.

The grid below is the standard US convention. Neck sizes step by half an inch; centimeter values are unit conversions of the inch values; EU collar sizes are the neck in centimeters, rounded up to a whole number — which is why a 16-inch collar sells as a 41 even though 16 inches is 40.6 cm. The full cross-reference between US, EU, UK and Italian systems is on the international conversion chart. The alpha column is the letter most US brands print on the same shirt, and it is the least reliable column in the table.

Sleeve sizes are the same measurement in every system — arm length from center back of neck to wrist — so the sleeve table is short:

Treat the alpha column as a loose translation, not a size. Letter sizes have no fixed definition, and the drift is measurable: in ShirtMath's published t-shirt specifications, the letter M spans a 17.5-inch flat chest in a ladies' cut and up to 20.5 inches in unisex cuts — a 3-inch spread inside one letter. The t-shirt size chart shows that spread size by size, and the vanity sizing guide explains how letters came loose from the tape in the first place. Neck sizes cannot drift that way. An inch is an inch, which is exactly why the dress-shirt system survived while everything else went to letters.

The two numbers on the label fix exactly two dimensions. Everything else about how the shirt fits — chest, waist, armhole depth, how much fabric bunches when you tuck it in — is set by the cut, and the cut is not encoded in the size. The variable doing the work is ease: the difference between the garment's girth and your body's girth. Every woven shirt needs positive ease so you can sit, reach and breathe; the cuts differ in how much they allow and where they put it.

Classic (regular). The fullest cut: generous chest and waist ease, deeper armholes, a straight body from chest to hem. It accommodates the widest range of bodies and billows the most when tucked.

Slim. The same collar and sleeve with the chest and waist cut closer to the body, higher armholes, and often darts pulling the back in at the waist. Cleaner standing lines; less room to reach and sit.

Athletic (tailored with a drop). Keeps chest and shoulder room near classic but tapers sharply to the waist. It is built for a large chest-to-waist difference — the build that slim punishes across the chest and classic drowns at the waist.

The consequence: two shirts both labeled 16 34/35 can differ by inches around the chest while both being "your size." The label cannot settle that; a tape measure can. Measure a dress shirt that already fits you well — the next section shows how — and you have the numbers the label leaves out.

There are two routes: measure your body, which is what the sizing system expects, or measure a shirt that already fits, which is what actually predicts fit. Doing both takes about five minutes with a soft tape.

The garment method is the more reliable of the two because it skips the body-to-garment translation entirely — the maker's ease assumptions, the rounding, the cut. That is the principle this whole site runs on: the eight flat measurements ShirtMath records for tops predict fit better than any size on any label. The general version, for any shirt in your closet, is how to measure a shirt.

Big and tall are two different corrections, and conflating them is how big-and-tall shirts earned a reputation for fitting nobody. Big adds girth: more chest, waist and hem at a given neck size, with collars extending past the standard grid — 19, 20 and up, following the same half-inch steps. Tall adds length: a longer body and longer sleeves at a given girth, which is why tall programs stock the 36/37 sleeve as standard.

The classic mistake is buying a bigger neck to get a longer sleeve. Off-the-rack grading does couple the two — larger collars are cut with longer sleeves — so it half-works, at the cost of a collar you can fit a fist behind. If sleeve length is the problem and girth is not, the fix is a tall size or an exact-sleeve shirt at your real neck size, not the next collar up.

The notation never changes. A 19 34/35 reads exactly like a 16 34/35: neck in inches, sleeve in inches. Once you can read the system, the big-and-tall wall is the same chart with more rows.