A “size 31” in women’s jeans usually means the waist measurement is around 31–32 inches, but the exact fit depends on the brand and cut of the jeans.

Quick Scoop: What is a size 31 in women’s jeans?

  • In most women’s denim, the number 31 refers to the waist in inches , roughly a 31–32 inch natural waist.
  • Many size charts link a size 31 jean to about a US dress size 10–12, depending on the brand.
  • Hips for a size 31 are often around 41–43 inches on typical brand charts.
  • Fit will change with style (skinny vs relaxed), fabric stretch, and rise, so two “31” jeans from different brands can feel very different.

Typical conversions (approximate)

[4] [4] [1][4] [8] [8]
Jeans labelNatural waistNatural hipApprox dress sizeUK sizeUS size
31 32–33 in41–42 inUS 10–12 (varies by brand)UK 13 (brand converter approx)US 8–10 on some converters
_(Different charts don’t always agree, which is why the numbers are a range rather than one exact size.)_

How to tell if 31 is right for you

  1. Measure your natural waist (smallest part of your torso, usually just above your belly button).
  2. If you’re around 31–32 inches there, a 31 in many women’s jeans is a reasonable starting point.
  1. Check the brand’s own size chart, since some brands say a 31 fits a 32 in waist and 43 in hip and call that a US 12, while others call 31 closer to a US 10.
  1. Consider the cut: skinny fits tighter at hips and thighs; relaxed or wide leg will feel looser even in the same numeric size.

Quick example

If your waist is 31.5 in and hips are about 42 in, most mainstream denim size charts would point you toward a 31 in women’s jeans, likely around a US 10–12 equivalent depending on the brand.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.