Shirt Size Chart

Shirt sizes vary by shirt type, fit style, gender, and country of origin. A men’s S/M/L t-shirt size is based on chest circumference. A dress shirt size is based on neck circumference and sleeve length. A women’s shirt size uses chest, waist, and hip measurements that convert differently to S/M/L labels than men’s sizing. This guide covers every major shirt type with its own size chart, measurement method, and fit style breakdown.

TLDR: For t-shirts, measure chest circumference and match to the chart. For dress shirts, measure neck circumference and sleeve length separately: both are needed. For women’s shirts, chest measurement is primary but waist and hip determine fit accuracy. Always measure the body, not an existing garment, for the most accurate size selection.

For branded apparel production, shirt type and fit style determine which blank is ordered, which decoration method is viable, and how size runs should be distributed across an order. A regular-fit unisex t-shirt has a completely different size distribution curve than a slim-fit women’s polo. Both require the correct size chart before production can begin.

Key Takeaways

• Measure chest, not shirt: Body measurements give consistent results across brands. Garment measurements vary by brand and fit style even within the same labeled size.
• Dress shirt sizing needs two measurements: Neck circumference sets the collar size. Sleeve length sets the sleeve size. A dress shirt labeled 15.5/33 means a 15.5-inch neck and a 33-inch sleeve.
• Athletic fit runs approximately one size smaller: A chest that measures into a size L in regular fit typically requires an XL in athletic or compression fit due to reduced ease in the torso.
• Women’s and men’s sizing are not interchangeable: A women’s M is cut for different shoulder width, bust, and waist proportions than a men’s M. Unisex sizing follows men’s proportions and runs large on most women.
• International size conversion is approximate: A US M is approximately a UK M, EU 48–50, and Japan L. These are not exact equivalents and vary by manufacturer.

How to Measure for a Shirt

Accurate body measurements are the foundation of correct shirt sizing. Use a soft flexible tape measure. Measure over light undergarments, not over outer clothing. Keep the tape parallel to the floor for all circumference measurements and taut but not tight against the body.

Men’s T-Shirt Size Chart

Men’s t-shirt sizes are based on chest circumference. The size chart below covers standard/regular fit, which includes the most common ease allowance across mass-market and branded apparel production. Measurements are body measurements, not garment measurements. Garment measurements are typically 1–2 inches larger than body measurements to provide wearing ease.

Athletic fit vs. regular fit t-shirt sizing

Athletic fit t-shirts are cut narrower through the torso and shorter in the body than regular fit at the same labeled size. A chest that measures 41 inches fits a size L in regular fit with comfortable ease. In athletic fit, that same chest measurement typically requires an XL to achieve equivalent ease, because athletic fit garments are designed to sit closer to the body without pulling across the chest or shoulders.

For branded t-shirt production, specifying fit style in the brief matters as much as specifying size. Two blanks from different suppliers both labeled L can have garment chest measurements that differ by 2–3 inches depending on whether they are cut for regular or athletic fit. Always confirm the garment measurement spec of the blank, not just the labeled size, before finalizing the size run for a production order.

Women’s T-Shirt Size Chart

Women’s t-shirt sizing uses chest (bust) as the primary measurement, with waist and hip as secondary inputs for fitted styles. Women’s sizing labels (XS through 3XL) cover a wider range of body measurements than men’s equivalents at the same label because women’s bodies have greater variation in waist-to-bust and hip-to-bust ratios within a single chest size band.

Unisex sizing on women’s bodies

Unisex t-shirts are patterned to men’s proportions: wider shoulders, straighter torso, and longer body length relative to chest size. On most women, a unisex shirt in the chest-matching size runs large through the shoulders and boxy through the waist. Women who prefer a closer fit in a unisex shirt should size down one size from their chest measurement. Women who prefer a relaxed fit should size to their chest measurement and expect extra room through the waist and hips.

Men’s Dress Shirt Size Chart

Dress shirts use a two-number sizing system: neck circumference and sleeve length, expressed as neck / sleeve (for example, 15.5/33). Both measurements are taken from the body, not from an existing shirt. Neck and sleeve are sized independently: a man with a 15.5-inch neck can have a 32-inch or 34-inch sleeve depending on arm length, and both are available from most dress shirt manufacturers.

How to measure neck for a dress shirt

Wrap the tape around the base of the neck where the collar would sit, just above the collarbone. Add 0.5 inches to the measured circumference. This addition accounts for comfort: a dress shirt collar at exactly the neck measurement will feel tight when buttoned. The 0.5-inch addition is standard in the industry and is already factored into the labeled neck sizes above, so do not add it again if the size chart states it uses body measurements with ease included.

Men’s Polo Shirt Size Chart

Polo shirts size by chest circumference like t-shirts, but the structured collar and button placket create a different fit profile. Polo shirts in regular fit have slightly more torso ease than athletic-cut t-shirts at the same chest size. The collar height and placket construction mean polo shirts cannot be sized down for a closer fit the way a jersey knit t-shirt can without the collar appearing too small for the head opening.

For branded polo shirt production, confirm whether the blank uses a flat-knit collar or a rib-knit collar before finalizing the size run. Flat-knit collars hold their shape through repeated washing and maintain consistent collar height across the size run. Rib-knit collars stretch with the garment but can lose height definition over time, which affects how embroidery sits on the collar edge at different sizes.

Youth and Kids Shirt Size Chart

Children’s shirt sizes are organized by age, but head circumference growth and body proportions vary significantly between children of the same age. The measurements below are average ranges for each age group. A child at the upper end of the chest measurement for their age bracket should size up to the next group.

International Shirt Size Conversion Chart

International shirt sizing does not follow a single global standard. The same body measurement maps to different size labels in the US, UK, Europe, and Asia. The table below shows approximate equivalents across the most common markets. These are guidelines: individual brands within each market set their own sizing patterns and the actual garment measurements should always be confirmed against a brand-specific size chart.

Why Asian sizing runs smaller

Japanese and Korean shirt sizing is calibrated to average body measurements in those markets, where average chest circumference is smaller than US and European averages at comparable ages. A US size M (38–40 inches chest) corresponds to a Japan L or XL rather than a Japan M. Brands sourcing blanks from Asian manufacturers for US or European markets must confirm whether the blank is sized to the manufacturer’s domestic market or to export sizing, because the same label can mean two different garments.

Fit Style Comparison by Shirt Type

Fit style is independent of size. Two shirts labeled the same size in the same chest range can have completely different silhouettes depending on how they are patterned. The table below shows the key fit dimensions that change between common fit styles for men’s shirts.

Size Run Distribution for Branded Shirt Orders

Ordering branded shirts for a group, team, or retail program requires a size run: a quantity breakdown across sizes that matches the expected distribution of the recipient population. Ordering all sizes equally wastes budget on sizes that go unclaimed while common sizes sell out. The distribution below is an industry-standard starting point for general adult mixed-gender programs.

Recommended size run for general adult orders

For a 100-piece branded shirt order targeting a general adult US audience: 5% XS, 15% S, 30% M, 30% L, 15% XL, 5% 2XL. This distributes weight toward medium sizes where the majority of adult bodies fall. For programs that skew male, increase L and XL by 5% each and reduce XS and S by the same amount. For programs that skew female, increase S and M by 5% each and reduce XL and 2XL accordingly.

For retail programs where customers self-select their size, the distribution skews differently than for gifting programs where recipients receive a pre-assigned size. Self-select retail programs should weight toward M and L more heavily and carry deeper XL inventory, because customers who cannot find their size at retail will not purchase rather than size up or down the way a gift recipient might accept a near-fit.

Get the Latest Shirt Size Chart

Shirt sizing specifications can vary between manufacturers, and size charts may change as brands update their patterns or introduce new fit options. The measurements provided in this guide are accurate reference points based on current production standards. However, the exact garment measurements for a specific blank style should always be verified before placing a production order.

Contact the MFG Merch team for a confirmed size chart tailored to the shirt style, blank brand, and fit type you plan to order. Simply provide your shirt type, fit preference, quantity, and target audience, and our team will send a verified size breakdown along with your production quote.

FAQ

How do I find my shirt size?

Measure your chest circumference at the fullest point, under the arms and across the shoulder blades, using a soft tape measure. Match that measurement to the size chart for the shirt type you are ordering. For dress shirts, also measure your neck circumference at the base of the neck and your sleeve length from the center back of the neck to the wrist. If your measurement falls between two sizes, size up for a more comfortable fit or size down if the shirt is an athletic or slim fit intended to sit close to the body.

What is the difference between shirt size S and M?

In men’s t-shirts, size S typically fits a chest of 34–36 inches and size M fits a chest of 38–40 inches. The difference is approximately 4 inches of chest circumference, which translates to roughly 2 inches of width across the front of the shirt when laid flat. Shirt length increases by approximately 1 inch between sizes. In slim and athletic fit shirts, the waist and hip taper are also more pronounced in S than in M, making the silhouette difference more visible than in regular fit shirts.

What is a unisex shirt size?

A unisex shirt is patterned to men’s body proportions and sized to men’s chest measurements, but it is labeled as suitable for all genders. The chest measurement range is the same as a men’s size at the same label, but the shoulder width, torso length, and body taper follow men’s averages rather than women’s. Most women find unisex shirts run large through the shoulders and have excess fabric at the waist relative to a women’s shirt of the same chest size. Women ordering unisex shirts typically size down one size from their chest measurement to achieve a closer fit.

How do shirt sizes differ between brands?

Shirt sizes differ between brands because there is no mandatory industry standard for garment measurements at a given size label. A size M from one manufacturer may have a garment chest measurement of 40 inches while a size M from another manufacturer measures 42 inches. This two-inch difference represents a half-size in US shirt sizing and is enough to change how the shirt fits on the same body. Always check the garment measurement specification, not just the size label, when ordering from a new blank manufacturer or switching blank suppliers between production runs.

What size shirt should I order for a team or group?

For a general mixed-gender adult group, use a size distribution of approximately 5% XS, 15% S, 30% M, 30% L, 15% XL, and 5% 2XL as a starting point. Adjust toward larger sizes for a male-dominant group and toward smaller sizes for a female-dominant group. If possible, collect actual size preferences from participants before ordering rather than estimating from demographics, because self-reported size preferences produce a more accurate distribution than demographic modeling and reduce size exchange requests after delivery.