Size Chart: Convert XXXXL and Any Size From L to 8XL (US, UK, EU, China & Japan)

Browse size charts by size, garment or audience

Every page below shares the same underlying US/UK/EU/CN/JP conversion data as the tool above, laid out around the specific size, garment or audience people search for most. If you already know exactly which size or garment you're checking, these go straight to the detail instead of making you scroll past every other size first.

• XXXL size chart – what XXXL (3XL) means, its chest measurement range, how it maps to EU sizing and women's numeric 3X, and why 3XL and 3X aren't quite the same cut.
• XXXXL size chart – the full 2026/2027 reference table from L to 8XL, with XXXXL (4XL) highlighted, plus how much bigger 4XL runs than 3XL and why this chart is dated ahead of the stale "2024" charts still showing up in search results.
• Shirt & jersey size chart – chest, neck and sleeve measurements together (a dress shirt needs all three, not just chest), plus the looser cut athletic jerseys tend to use.
• Women's plus-size chart – numeric sizing (14W–32W) converted to US/UK letter, EU, China and Japan, for shoppers working from a dress or pants size rather than a men's/unisex letter.

Full size chart (US/UK/EU/CN/JP, L–8XL)

This is the same data the converter above uses, laid out as a full reference table so you can compare every size at once or print it for later. It covers men's and unisex tops from L through 8XL, which is the range most mainstream retailers stop labelling clearly, forcing shoppers to guess or contact support.

Want the deep-dive version of a specific row? The XXXL size chart and XXXXL size chart pages cover those two sizes in more detail, including how they compare to numeric and brand-specific sizing.

How to use this size converter

The tool above works from a single measurement: your usual US letter size (or, for the women's tab, your usual US numeric size). Pick a category, pick a size, and the breakdown updates instantly with the closest UK, EU, China and Japan equivalents, plus a chest or bust measurement range so you can double-check against your own tape measure rather than trusting a label alone. The whole thing runs in your browser: no size selection is transmitted anywhere or stored on a server, see our privacy policy for the full explanation.

1. Choose Men's/Unisex Tops or Women's Plus (Numeric) using the two buttons above the converter.
2. Select your current US size from the dropdown.
3. Read the breakdown: EU size, chest or bust range in inches and centimetres, and the China/Japan equivalent.
4. If you're between two sizes on the chest measurement, size up rather than down for plus-size garments, since a tight fit across the shoulders and chest is harder to live with than a slightly loose one.

What do XL, XXL, XXXL and XXXXL actually mean?

The letter system is a doubling convention, not a fixed unit. "L" is Large. Add one X for every step up from there: XL (extra large), then XXL, then XXXL, then XXXXL, and so on up to 8XL or higher depending on the brand. Retailers often write these two ways, either as repeated X's (XXXL) or as a number-plus-X shorthand (3XL), and they mean exactly the same size.

What the letters don't tell you is how many inches separate one from the next, and that's where brands genuinely diverge. A 3XL dress shirt from one manufacturer might have a 54-inch chest, while another brand's 3XL sits closer to 56 or even 58 inches. The table above uses the general, widely published increments (roughly 4cm or 2 inches of chest per size step) that most mainstream plus-size retailers build their own charts around, but if a specific brand publishes its own size guide, that always takes priority over a general reference like this one.

How to measure your chest (or bust) for an accurate size

A size label is only as accurate as the measurement it's based on, and guessing from how a similar item fits is one of the most common ways plus-size shoppers end up returning something. Five minutes with a soft tape measure gets you a far more reliable starting point than any letter on a tag.

• Chest/bust: wrap the tape around the fullest part of your chest, under the arms and across the shoulder blades, keeping the tape level all the way around and snug but not compressed.
• Don't hold your breath or pull the tape tight to "improve" the number; a measurement taken while breathing normally is the one that will actually match how the garment fits day to day.
• Measure over a well-fitting t-shirt or light top rather than bare skin or bulky outerwear, since both extremes throw the number off by an inch or more.
• If your measurement falls between two rows in the table, choose the larger size; a plus-size garment with a couple of inches of extra ease is comfortable, while one that's too tight across the chest or shoulders usually isn't wearable at all.
• Re-measure every year or two. Body measurements change, and using an old number is one of the most common reasons an order that used to fit no longer does.

US, UK and EU sizing: what actually changes between them

For men's and unisex tops, US and UK letter sizes generally track each other: an XL in a US-market brand and an XL sold in the UK usually sit in the same chest range, since both countries grew up on the same L/XL/XXL letter progression. The bigger jump is to EU sizing, which drops the letters altogether in favour of a numeric scale (EU 50, 52, 54 and up) tied directly to chest circumference in centimetres. That's why the converter above always shows an EU number alongside the US/UK letter: it's translating between two genuinely different labelling systems, not just relabeling the same number.

Women's sizing adds a third axis on top of that. US women's plus sizing runs on its own numeric "W" scale (14W, 18W, 22W and up) that isn't the same numbering as men's/unisex letters or EU sizing, which is part of why a size that reads as "large" on one label can read as a completely different number on another. See the women's plus-size chart for how the W-numbers, letter equivalents (1X–5X) and EU sizes line up.

None of this is a flaw in any one system: US, UK and EU sizing simply developed independently, around different historical measurement conventions, and never converged on a shared standard the way, say, shoe sizing loosely has. A converter is the practical fix, not memorising a formula.

China (CN) and Japan (JP) sizing: why the same label doesn't fit the same

One of the most common surprises when ordering plus-size clothing internationally is that a garment labelled "XL" or "3XL" from a China-based retailer often fits noticeably smaller than the same label from a US or European brand. This isn't a mistake on the converter's part, it's a well-documented pattern across Chinese apparel sizing generally: the same printed size tends to run one to two sizes smaller than the equivalent US/UK label. The safest approach when ordering from a China-based store is to size up by one or, for anything near the top of your usual range, two sizes rather than ordering your normal label.

Japanese plus-size sizing uses a different convention altogether: instead of repeating letters, it multiplies "L", so a Japanese 3L, 4L or 5L corresponds roughly to a Western 2XL, 3XL or 4XL. "LL" is effectively 2L. The table above lists the closest Japan (JP) equivalent for each Western size, but as with China, actual fit varies by brand, and Japanese cuts sometimes run narrower through the shoulders even at the equivalent chest measurement.

In both cases, if the retailer publishes its own size chart on the product page, use that over the general conversion here. This page is designed as a fast, free starting point, not a replacement for a brand's own measurements when they're available.