Women's Jeans Size Converter
Enter your waist measurement in inches (or a US size you already know) to get the equivalent US, UK and EU jeans size — including a direct answer for "what size is 29 or 31 in women's jeans" — plus a real, brand-named explanation of vanity sizing.
US 6 · UK 10 · EU 36
Typical waist range: 28.5"–29.5"
Vanity sizing means these numbers are a starting point, not a guarantee: brands like True Religion, 7 For All Mankind, AG Jeans commonly cut about 1.5 sizes smaller than this standard chart — always check the brand's own size guide or try before you buy when possible.
Full size chart (US / UK / EU / waist)
| US | UK | EU | Waist (in) |
|---|---|---|---|
| 00 | 4 | 30 | 23–24 |
| 2 | 6 | 32 | 25.5–27.5 |
| 4 | 8 | 34 | 27.5–28.5 |
| 6 | 10 | 36 | 28.5–29.5 |
| 8 | 12 | 38 | 29.5–30.5 |
| 10 | 14 | 40 | 30.5–31.5 |
| 12 | 16 | 42 | 31.5–32.5 |
| 14 | 18 | 44 | 32.5–33.5 |
| 16 | 20 | 46 | 33.5–34.5 |
| 18 | 22 | 48 | 34.5–36.5 |
| 20 | 24 | 50 | 36.5–38.5 |
| 22 | 26 | 52 | 38.5–40.5 |
| 24 | 28 | 54 | 40.5–42.5 |
Table cross-checked against Blitzresults and Size.ly. How we calculate →
What size is 29 or 31 in women's jeans?
A 29" waist falls in the US size 6 range (typically 28.5"-29.5"), which converts to a UK 10 / EU 36. A 31" waist falls in the US size 10 range (30.5"-31.5"), converting to UK 14 / EU 40. These are standard-chart midpoints — your actual best size depends on the specific brand's cut, since jeans sizing varies more between labels than almost any other clothing category.
The most reliable way to use a size chart like this one is to measure your actual waist in inches with a soft tape (around the narrowest point, usually just above the belly button) and match that number to the chart, rather than assuming your size in one brand carries over to another.
US to UK and EU jeans size conversion
The standard conversion is US size + 4 = UK size (a US 4 is a UK 8), and US size + 30 = EU size for most of the range (a US 4 is an EU 34). These offsets are consistent across most mainstream retailers, but designer and premium denim brands frequently deviate — always check a specific brand's own conversion chart when it's provided, since it reflects their actual pattern-making rather than the industry-standard offset.
Vanity sizing: why the same waist measurement gets different numbers at different stores
"Vanity sizing" is the well-documented practice of labeling jeans with a smaller size number than the standard chart above would suggest, to make the size feel more flattering. Brands publicly associated with running smaller-than-standard sizing include True Religion, 7 For All Mankind, AG Jeans — commonly by around 1.5 sizes relative to the standard chart, though the exact gap varies by style and cut within each brand.
Because of vanity sizing, the single most useful number when shopping a new brand is your actual waist measurement in inches, not the size you normally wear — use the calculator above with your measured waist to get a same-brand-agnostic starting point, then adjust from the specific brand's own chart if one is provided.
Frequently asked questions
What size is 29 in women's jeans?
A 29" waist is typically a US size 6 (standard range 28.5"-29.5"), UK 10, EU 36.
What size is 31 in women's jeans?
A 31" waist is typically a US size 10 (standard range 30.5"-31.5"), UK 14, EU 40.
How do I convert US jeans size to UK size?
Add 4 to the US size — a US 4 is a UK 8. This offset is consistent across most mainstream brands, though some designer labels vary.
How do I convert US jeans size to EU size?
Add roughly 30 to the US size for most of the range — a US 4 is an EU 34. Below US size 2, the EU offset compresses slightly (documented in the chart above), so check the exact row rather than applying the +30 rule at the smallest sizes.
What is vanity sizing in jeans?
The practice of labeling a garment with a smaller number than the standard size chart would predict for the same measurements, to make the size more flattering. Brands like True Religion, 7 For All Mankind, AG Jeans are commonly cited as running about 1.5 sizes smaller than standard.
Should I go by waist measurement or my usual size when buying a new jeans brand?
Waist measurement. Your "usual" size is only reliable within a brand you already own, since vanity sizing and cut differences mean the same size number can correspond to a 2-3 inch difference in actual waist between brands.
Researched & verified by the Calcuris Data & Research Team. How we build and check our tools →