UK 12 women's size in EU
Maintained by the ToolCross team. Conversions follow published US/UK/EU charts; women's body bands follow EN 13402. Charts last verified June 2026.
A women's UK 12 (women's tops & dresses) is EU 40. Across systems that's US 8, UK 12, EU 40, Japan 11 and international M. Under the EN 13402 body bands that sits around a 88 cm bust and 72 cm waist. Sizing is advisory and varies by brand, so treat this as your starting point.
Sizes around UK 12
iReverse: EU 40 = UK 12. The highlighted row is UK 12.
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▼✦Sizes vary by brand and cut. Use this as a starting point and check the brand's own chart when you can.
What this means in practice
A UK 12 (EU 40) lines up with roughly a 88 cm bust (~34.6 in), 72 cm waist and 96 cm hip under the EN 13402 bands. If your bust measures more than about 90 cm you'll usually be more comfortable one size up; under about 86 cm, size down. These are advisory bands — high-street brands vary, so measure rather than trust the label.
How we calculate this
Women's conversions follow widely-published US/UK/EU charts (UK = US + 4, EU = US + 32), and the body-measurement guidance follows the EN 13402-3 body bands (4 cm girth steps). For UK 12 that anchors on a 88 cm bust / 72 cm waist band. EN 13402 sizing is advisory, not absolute — it standardises the size systems, not every brand's cut.
iReviewed against published size charts. Charts last verified June 2026.
Common questions
Is UK 12 the same as EU 40?
Yes — a women's UK 12 corresponds to EU 40. Across systems: US 8, UK 12, EU 40, Japan 11, M.
What body measurements does UK 12 map to?
Around a 88 cm bust, 72 cm waist and 96 cm hip under the EN 13402 bands. If you're between sizes, compare your own measurements rather than the label.
How do I convert EU 40 back to UK?
EU 40 = UK 12. The conversion works the same in both directions.
Why might my converted size still not fit?
Conversions line up the size systems, not every brand's cut. Two garments labelled the same can fit differently, so use this as a starting point and check the brand's own chart.
Full size charts, how-to-measure guide & FAQ▼
How clothing size systems relate
The US and UK use numbers (or chest inches for menswear), the EU uses its own numeric scale, and Japan mixes numbers and letters. Most of the world also labels garments S / M / L / XL. Women's and men's systems do not convert the same way, so use the matching chart below. Fit still varies by brand — treat the equivalent size as your starting point.
Women's size conversion chart (tops & dresses)
Women's size conversion chart (tops & dresses)
iWomen's tops/dresses: UK = US + 4, EU = US + 32. Japan and the S–XL band follow published charts.
Men's size conversion chart (tops & suits)
Men's size conversion chart (tops & suits)
iMen's tops/suits use chest size in inches: US = UK, EU = US + 10. Japan uses letter sizes.
How to find your size before you buy
Follow these quick steps for the most accurate fit.
Measure your chest/bust at the fullest point with a soft tape, kept level and snug.
Your chest measurement in inches is your US/UK size; add 10 for EU.
Find your usual home size in one column and read across for the rest.
Size up for outerwear and tailored fits.
