Men's Shirts Size Chart

The one garment chart on this site built from genuine unit arithmetic

Nearly every conversion table on this site translates between differently constructed historical scales — Paris points, barleycorns, arbitrary running numbers. Dress-shirt collar sizing is the exception: US and UK sizing state neck circumference directly in inches, and EU sizing states the identical measurement in centimetres, so the whole chart above is genuinely just one real number expressed in two units, not four separately evolved conventions pretending to relate to each other.

A 16-inch neck is a 16-inch neck regardless of which country's label is on the collar — the numbers on this chart are unit arithmetic, not a coded scale, so unlike shoe or dress sizing there's no last shape or vanity-sizing drift to second-guess. Where uncertainty creeps back in is everything the chart doesn't show: sleeve length, overall body cut, and fabric treatment.

The sleeve figure disappears in some markets and not others

The two-number US/UK convention (16/34) is really two separate charts squeezed onto one tag, while continental sizing is usually happy to publish just the neck figure and let sleeve length ride on a house-average assumption. That works fine for an average build; anyone whose arms run notably longer or shorter than their neck size implies is the exact person this shorthand quietly fails, since a single number can't flag a mismatch it was never designed to check for.

Slim-fit-as-default is a European convention, not a universal one

A lot of contemporary continental European shirtmaking treats a slim, close body cut as the standard offering rather than an optional style choice, while mainstream American and British dress shirts more commonly default to a roomier cut through the chest and waist. A correctly converted neck size from a European brand can still feel noticeably closer-fitting through the body than the equivalent American shirt — a cut philosophy, not a sizing-number problem, and one this chart's neck-circumference column can't capture.

Business culture shaped how precisely different markets grade sizing

American office dress codes have generally loosened toward business casual earlier and more broadly than most continental European workplace conventions, which is part of why a lot of mainstream US shirt lines now emphasize stretch-woven and non-iron treatments as standard features — options that a more formally minded traditional European shirtmaker may simply not prioritize the same way. If easy-care fabric matters as much as the size conversion, check for it specifically rather than assuming every brand treats it as standard.

Custom and made-to-measure shirting has become far more mainstream in the US

A meaningful and growing part of the American dress-shirt market is now online made-to-measure — a shopper enters their own neck and sleeve figures directly rather than converting through a ready-to-wear brand's size run at all. This option is considerably less developed and less affordable across most of continental Europe, where custom shirtmaking remains more of a traditional luxury service than a mainstream retail category, which is worth knowing if you're finding ready-to-wear conversions consistently imprecise for your own proportions.

Casual shirts and polos don't follow this chart at all

Everything above describes dress shirts sized by neck circumference specifically. Casual button-downs, polos, and t-shirts are far more commonly sized by alpha size (S/M/L) tied to chest measurement rather than neck circumference, an entirely separate convention — converting a dress-shirt neck size doesn't tell you anything useful about which alpha size fits a casual shirt from the same or a different brand.

What to check before an unfamiliar order

Measure your neck circumference directly where you can, know your sleeve length independently since not every system states it explicitly, and expect a slimmer default cut from a lot of continental European brands than from mainstream American or British ones — three separate checks layered on top of what is otherwise the most reliable raw conversion arithmetic on this entire site.

Fabric weave affects how forgiving a converted collar size feels

A shirt woven from a fabric with some natural give, like certain cotton-blend poplins, tolerates a slightly imprecise neck conversion more comfortably than a stiffer, more tightly woven fabric does, since the fabric itself yields a little around the collar button — worth keeping in mind if a converted size feels borderline and you're deciding whether to round up or down for a specific fabric.

Collar style changes the practical fit at a given neck size

A button-down collar, a spread collar, and a band collar all sit against the neck differently even at an identical stated circumference, since the collar's own height and stiffness affect how snug it feels — a converted size that's correct for one collar style from a brand isn't automatically the ideal choice for every collar style that same brand offers.

Formality level shapes which conversion issues matter most

A dress shirt meant to be worn buttoned to the top under a tie needs a more precise collar conversion than a casual shirt worn open at the neck, where a size that's slightly generous barely registers — worth weighing how formally you'll actually wear the shirt when deciding how strictly to apply this chart's numbers.

Older shirts in a wardrobe are a weaker reference than a fresh measurement

A shirt bought years ago, especially one that's been through many washes, may have shrunk slightly at the collar or stretched slightly through the body, making its printed size a less reliable starting point for a new purchase than measuring your current neck circumference directly — worth doing before restocking a wardrobe staple you haven't bought fresh in a while.

A tuxedo or wing-collar formal shirt sometimes uses its own separate size logic

A formal wing-collar or pleated-front tuxedo shirt is occasionally cut and sized slightly differently from a brand's everyday dress-shirt line, since the stiffer formal collar and structured front panel behave differently against the neck and chest than a standard soft collar does — checking that specific formal-shirt line's own chart, rather than assuming it matches the brand's regular dress-shirt sizing, is worth doing ahead of a black-tie event where there's no time to fix a surprise.

A tailor can take in the body and shorten sleeves more easily than resize the collar

Sleeve length and body width are both routine, inexpensive tailoring adjustments on a dress shirt, while the collar itself is far harder to alter without unpicking and rebuilding the entire collar band — a shirt with a correctly converted neck size but a body or sleeve that runs slightly off is a much easier fix than one where the neck itself measures wrong.

Monogramming and other permanent customization should wait until fit is confirmed

A shirt monogrammed with initials before its first wear can't be returned by most retailers even if the size turns out to be wrong, so ordering a first shirt from an unfamiliar brand unmonogrammed, confirming the fit, and adding personalization to a repeat order is a safer sequence than customizing on a first, unverified purchase.

Iron-free treatment can make a shirt sit slightly differently against the collar than untreated cotton

The chemical finish applied to a non-iron or wrinkle-resistant shirt stiffens the fabric slightly compared with an untreated cotton of the identical weave, which can make a borderline collar size feel a touch snugger in the treated version than in an equivalent soft, untreated shirt at the same converted neck measurement — worth trying the specific treated line if a standard cotton shirt from the same brand has previously fit comfortably at a size you're unsure about.

Travel and wrinkle-release fabrics prioritize packability over the usual weave feel

A shirt marketed specifically for travel typically uses a tightly engineered synthetic-blend weave designed to shed wrinkles from being packed in a suitcase, which behaves differently against the collar and cuff than the natural-fibre wovens covered above, so a converted size that fits well in a standard cotton dress shirt from a brand is worth double-checking specifically in that brand travel line rather than assumed identical.