Find your perfect shirt size in US, EU, UK, Japan, and Korea sizing systems

Finding the right shirt size should be simple, but with so many sizing systems — US, European, UK, Japanese, Korean — and different conventions for dress shirts versus casual shirts, it quickly becomes confusing. Our Men's Shirt Size Calculator takes the guesswork out of shirt shopping, whether you're buying online, in a foreign country, or ordering a dress shirt for a formal occasion. Men's dress shirts use a two-number sizing system: collar size / sleeve length (for example, 15.5 / 34). The collar number is your neck circumference in inches, with built-in ease — typically 0.5 inches more than your actual neck measurement — to ensure comfortable movement. The sleeve number measures from the center back of your neck, over your shoulder, and down to your wrist. European dress shirts convert collar size to centimeters, so a US 15.5 becomes approximately a EU 39–40 collar. Casual shirts, polos, and T-shirts typically use alpha sizing (XS, S, M, L, XL, XXL, 3XL) based on chest circumference. The same alpha size can correspond to very different chest measurements depending on the fit style. A Regular fit large might accommodate a 42–44 inch chest with 4 inches of ease, while a Slim fit large might allow only 2 inches of ease — meaning the shirt looks much narrower on the same body. Our fit comparison chart visualizes exactly how much room each fit type provides. Different brands also size differently. Brands like Zara and H&M are known to run smaller than US standard sizing, so you might need to size up. Ralph Lauren tends to run true to size or slightly large. Uniqlo's sizing varies by product line but generally aligns with US standard. Our brand-specific reference table shows you the chest range for each major brand at your recommended alpha size, so you can shop with confidence. Measuring yourself correctly is the first step to accurate sizing. For neck circumference, wrap a soft tape measure around the base of your neck, just below the Adam's apple, where your collar would sit. You should be able to slip one or two fingers under the tape — this mirrors the collar ease already built into shirt sizing. For chest circumference, measure at the fullest point of your chest, under your armpits, with the tape parallel to the floor. Keep your arms relaxed at your sides. For sleeve length, this is the most commonly misunderstood measurement: start at the center back of your neck (not the shoulder seam), run the tape over your shoulder with your elbow slightly bent, and end at your wrist bone. For waist, measure at the narrowest point of your torso, typically at navel level, with a relaxed breath. If you don't have a tape measure handy, our height and weight estimation mode gives a rough size based on body stats. This is less precise than actual measurements — the same height and weight can correspond to very different builds — but it's a useful starting point when tape-measure access is limited. We recommend confirming with actual measurements before purchasing dress shirts or tailored clothing. Our calculator supports both Imperial (inches, feet, pounds) and Metric (centimeters, kilograms) inputs, and it covers four shirt types: Dress Shirt (neck/sleeve sizing), Casual Shirt, Polo, and T-Shirt (all chest-based alpha sizing). For each type, you can select your preferred fit — Regular, Slim, Athletic/Muscle, or Relaxed — and the calculator adjusts the recommendation accordingly. Athletic fit sizing, in particular, prioritizes chest measurement over neck, since broader shoulders and chest are the limiting factor for this body type.

Understanding Men's Shirt Sizing

如何使用此计算器

常见问题