Clothing Size Conversion Calculator
Buying clothes from another country means decoding a size label that follows a different scale, and the numbers rarely line up by accident. This calculator converts a US women's dress size into its standard UK and EU equivalents so you can shop across regions with confidence. You enter your US size, and it returns the matching UK and EU numbers using the offsets that hold across the common range of women's wear. The relationships are simple: the UK size is the US size plus 4, and the EU size is the US size plus 32, which is why a US 8 corresponds to a UK 12 and an EU 40. The EU numbers look much larger because that system is built on a higher base scale, not because the garment is bigger. These offsets are dependable rules of thumb, but sizing is not standardized worldwide, so treat the result as a starting point and confirm against the maker's own size chart for anything fit-critical. The same rules do not apply to men's clothing, which follows chest and waist measurements instead. Every figure here is computed deterministically, and the worked example below reconciles exactly to the calculator.
For women's dress sizes, UK = US + 4 and EU = US + 32. A US 8 converts to a UK 12 and an EU 40.
Size conversion formula
UK = US + 4
EU = US + 32
US = standard US women's dress size
offsets apply across the common range
Each regional scale is a fixed step away from the US numbering for standard women's wear, so adding the offset gives the equivalent label. Individual brands may differ, so confirm against a garment's own chart.
Worked example
Convert a US women's size 8.
- UK: 8 + 4 = 12
- EU: 8 + 32 = 40
A US 8 is a UK 12 and an EU 40. These are the calculator's default inputs, so the result above matches the widget exactly.
Women's size conversion table
| US | UK | EU |
|---|---|---|
| 4 | 8 | 36 |
| 6 | 10 | 38 |
| 8 | 12 | 40 |
| 10 | 14 | 42 |
| 12 | 16 | 44 |
Measurement and sizing standards: US National Institute of Standards and Technology (NIST).
Clothing size conversion calculator: frequently asked questions
How do I convert a US women's clothing size to UK and EU?
For standard women's dress sizes, the UK size is the US size plus 4, and the EU size is the US size plus 32. A US 8 is a UK 12 and an EU 40. These offsets hold across the common size range, though individual brands vary, so always check a garment's own size chart when you can.
Are these conversions exact?
They are reliable rules of thumb for standard women's wear, but clothing sizing is not standardized worldwide, and vanity sizing means two brands can label the same garment differently. Use the conversion as a starting point and confirm against the maker's measurements for fit-critical purchases.
Do the same offsets work for men's clothing?
No. Men's sizing usually follows chest or waist measurements in inches and often shares numbers between the US and UK, while the EU adds about 10 to a chest size. This calculator is built for women's dress sizes, where the plus 4 and plus 32 offsets apply.
What if my size is odd, like a US 7?
The offsets still apply, so a US 7 maps to a UK 11 and an EU 39. Many women's lines use even sizes, so an odd US number can land between common UK or EU labels. When that happens, size up or down based on the garment's measurements.
Why do EU sizes use such large numbers?
EU women's sizes are based on a different numbering scale that runs higher than US or UK numbers. The plus 32 offset from US sizing reflects that scale, so a small US number still corresponds to a much larger EU figure for the same garment.
Official sources
- Measurement, sizing and standards reference: US National Institute of Standards and Technology (NIST). As at 25 June 2026.
Reviewed by the CalculatorHub team, edited by James Graham, 25 June 2026. See our methodology. This is general information, not financial, tax, legal or investment advice.