A US 8 is a UK 12, an EU 40, an Italian 44 and a Japanese 13. Same body, five different numbers, none of which mean anything on their own. The converter above translates between them, and the rest of this page explains where the translation holds up and where it quietly stops working — because there is one point at which almost every size converter on the internet starts inventing sizes that do not exist.
Why every country numbers dresses differently
There is no international standard for women’s clothing sizes. There never has been. What each country uses is a historical accident that hardened into a convention.
- US and UK numbers are arbitrary labels. They do not refer to any measurement. A US 8 is called 8 because the size below it is called 6. The UK simply starts counting four higher.
- European numbers started as a measurement. German and general EU sizing derives loosely from the bust measurement in centimeters, halved and adjusted. That is why the numbers are so much larger — EU 40 is not four times bigger than a US 10, it is measuring something else entirely.
- France and Italy run their own offsets. French sizing sits two numbers above German, and Italian sits four above. So the same dress can be labelled DE 38, FR 40 and IT 42 depending on which market it was made for.
- Japan uses odd numbers. Japanese women’s sizing runs 5, 7, 9, 11, 13 and upward, on a scale built for a different average frame. It is the system that translates least well.
On top of all this sits vanity sizing, which is the reason your size seems to have drifted over the years. As average body measurements have increased, brands have relabelled their garments downward to flatter customers. A dress labelled size 8 in 1990 would carry a considerably smaller label today. If you have noticed that you are a different size than you used to be without your body changing much, you are noticing this, not imagining it.
Dress size conversion chart
The standard equivalents, for reference. The converter above does this for you, but a table is easier to scan if you already know your size and just want the number.
| US | UK | AU | EU / DE | FR | IT | JP | Letter |
|---|---|---|---|---|---|---|---|
| 0 | 4 | 4 | 32 | 34 | 36 | 5 | XXS |
| 2 | 6 | 6 | 34 | 36 | 38 | 7 | XS |
| 4 | 8 | 8 | 36 | 38 | 40 | 9 | S |
| 6 | 10 | 10 | 38 | 40 | 42 | 11 | S |
| 8 | 12 | 12 | 40 | 42 | 44 | 13 | M |
| 10 | 14 | 14 | 42 | 44 | 46 | 15 | M |
| 12 | 16 | 16 | 44 | 46 | 48 | 17 | L |
| 14 | 18 | 18 | 46 | 48 | 50 | 19 | L |
| 16 | 20 | 20 | 48 | 50 | 52 | 21 | XL |
| 18 | 22 | 22 | 50 | 52 | 54 | — | XL |
| 20 | 24 | 24 | 52 | 54 | 56 | — | 1X |
| 22 | 26 | 26 | 54 | 56 | 58 | — | 1X |
| 24 | 28 | 28 | 56 | 58 | 60 | — | 2X |
| 26 | 30 | 30 | 58 | 60 | 62 | — | 2X |
Where size conversion stops working
This is the part most converters will not tell you, and it is the reason we built ours to flag it.
Every conversion above is a fixed offset. UK is US plus four. EU is US plus thirty-two. Japan is US plus five. Arithmetic like that will keep producing numbers forever, which is exactly the problem: the numbers keep going, but the sizes stop.
Japanese numeric womenswear effectively ends around size 21. European sizing runs out around 56 to 58. Above those points, each country switches to its own plus-size labelling rather than continuing the sequence. So a converter that tells you that you are a Japanese 29, or a European 66, has given you a number that is arithmetically correct and completely unshoppable. You will search for it and find nothing.
When a converted size goes past the end of that country’s published chart, we mark it “Rarely made” instead of presenting it as a size you could go and buy. The number is still shown, because a number is more useful than a blank, but you know not to trust it.
If you shop above roughly a US 18, this matters. Buy from those regions by garment measurements, or from a retailer with a dedicated plus range, rather than hunting for a number that does not exist.
Why letter sizes are shown as a range
A letter size covers more than one numbered size. Medium is not a single measurement — in most US brands it spans a 8 and a 10. So converting from a letter cannot give you a single number honestly, and any tool that returns one is guessing on your behalf.
Choose a letter size in the converter and you get a range back. Where you sit within that range depends on the brand and on the cut, which is precisely the information a size label was never able to carry. Letter sizing is also where brands vary most wildly: one label’s L is another’s XL, and there is no authority to appeal to.
Why your dress size changed after 50
Three separate things are usually happening at once, and it helps to know which is which, because only one of them is about your body.
- Your measurements have redistributed. As estrogen falls through and after menopause, weight tends to move toward the midsection. The waist softens first, often without much change on the scale. If dresses now fit at the hip but not the waist, this is why.
- Your rib cage has widened slightly. This is gradual and normal, and it affects anything fitted through the bust and underbust. It also means the bra you are wearing under the dress may be the actual problem.
- The labels moved. Vanity sizing has shifted downward over your adult life. Some of your apparent size change is the industry relabelling, not you.
The practical response is the same in all three cases: stop buying by remembered size. Take your measurements once, write them down, and compare them to the garment chart. It takes two minutes and it is the single highest-value habit for shopping online at any age.
Not sure how your proportions have changed? Our body shape calculator works out which of the seven shapes your current measurements put you in, and what that means for cut and fit.
Measure the garment, not just yourself
The most reliable trick for buying online has nothing to do with size labels. Take a dress you already own that fits you well, lay it flat, and measure it: across the bust, across the waist, across the hip, and shoulder to hem. Write those four numbers down.
Most decent retailers publish flat garment measurements somewhere in the product detail. Compare theirs to yours and you will know whether it fits before you order, regardless of what number is on the label or which country it came from. This bypasses conversion entirely, and it is the only method that works across brands.
Four things that move you a size
Woven cotton, linen, taffeta and structured crepe have no give. If the dress is fitted and the fabric is rigid, size up.
Narrow sleeves are the most common reason a correctly sized dress is returned. Check the sleeve measurement, not just the bust.
If several reviewers say the same thing about fit, believe them over the size chart. They have worn it and the chart has not.
These are graded differently, not just shortened or lengthened. A curve 16 and a standard 16 are not the same garment.
Frequently asked questions
What is a US 8 in UK dress sizes?
A US 8 is a UK 12. The UK runs four numbers higher than the US across the whole range, so a US 6 is a UK 10, a US 12 is a UK 16, and so on. Australian sizing follows the UK.
Is EU sizing the same as French and Italian sizing?
No, and this catches people out constantly. General EU sizing matches German. French runs two numbers higher, and Italian runs four numbers higher. The same dress could be labelled DE 38, FR 40 or IT 42. If a retailer just says “EU”, they usually mean the German scale, but check the chart when it matters.
Why does my converted size still not fit?
Because conversion translates between labelling systems, not between brands. Two dresses labelled UK 14 from different labels can differ by two inches at the waist. Conversion gets you to the right shelf; garment measurements get you to the right dress.
Why does the converter say some sizes are “rarely made”?
Because the arithmetic keeps going after the real sizes stop. Japanese numeric sizing ends around 21 and European around 58, after which those countries use separate plus-size labelling. Rather than hand you a Japanese 29 that no one sells, we show the number and mark it. Shop those regions by garment measurements instead.
Does this converter work for jeans, shoes or bras?
No. It covers women’s dresses and general apparel only. Jeans are usually sold by waist measurement, shoes use entirely separate scales, and bras use a band-and-cup system that does not map onto dress sizes at all. Separate tools for those are on the way.
Has my size changed, or have the labels changed?
Probably both. Vanity sizing has moved labels downward over the past few decades, so an old size 12 and a current size 12 are not the same garment. Meanwhile menopause genuinely does redistribute measurements, particularly at the waist. Measuring yourself once settles which is which.
Are my sizes saved?
No. Your selection is sent to our server to be converted and is used only to produce the result you see. Nothing is stored, logged against you or shared. The shareable link contains only the size you chose, never anything about you.
