Find your perfect jacket or coat size in seconds. Enter your gender, height, chest width, and weight to get your recommended US jacket size, EU jacket size, and letter size (S/M/L). Works for both men's and women's sizing so you can shop with confidence.
US Jacket Size
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EU Jacket Size
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Letter Size
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Chest (cm)
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Jacket Length
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Sizing Note
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Wrap a flexible measuring tape around the fullest part of your chest, just under your armpits and across your shoulder blades. Keep the tape level and snug but not tight. This measurement in inches is the primary input for determining your jacket size.
US jacket sizes are typically expressed as a number (e.g., 38, 40, 42) representing your chest measurement in inches. EU sizes are roughly 10 points higher than US sizes — so a US 40 corresponds to an EU 50. Our calculator shows both so you can shop internationally with ease.
A US men's size 42 jacket is designed to fit a chest measurement of approximately 42 inches. In letter sizing, this typically falls in the Large (L) to Extra Large (XL) range depending on the brand and cut.
For women's jackets, a Medium (M) typically corresponds to a chest measurement of 37–39 inches (94–99 cm). This usually translates to a US size 10–12 or EU size 40–42, though this can vary by brand.
A 5'11" man with an average build and a chest of around 40–42 inches would typically wear a US size 40–42 Regular jacket, which is a Large (L) in letter sizing. The jacket length (Short, Regular, Long) depends on torso length — at 5'11" a Regular or Long length is usually best.
The most reliable method is to measure your chest circumference and use that as the primary size indicator. Your height helps determine the correct jacket length (Short, Regular, Long), while your weight and build help confirm whether you might need to size up or down. Always try a jacket on if possible, as cuts vary between brands.
For a slim fit jacket, you generally wear the same size as your chest measurement indicates, but the cut is more tailored and close to the body. If you're between sizes or have broader shoulders or a muscular build, consider sizing up. For a relaxed fit, some people go up one size for extra comfort.
Yes. While chest measurement is the primary factor, body build matters for fit. Athletic or muscular builds may need a larger size to accommodate broader shoulders even if the chest measurement is the same. Slim builds might find that a slim-cut jacket in their standard size fits better than a regular cut.