This comparison is really about denim, and that's good news: both brands sell men's bottoms by waist size in inches, so the labels finally mean something. Levi's goes further — its W/L system is an actual waist and inseam measurement, and its published chart shows each labeled size fitting a body waist about half an inch to an inch above the number. Uniqlo's bottoms use numeric waist sizes too, while its women's clothing stays in alpha sizes.
One caveat before the tables: tops are not an apples-to-apples comparison here. Uniqlo cuts tops on slim Japanese fit blocks and publishes ranges per letter; Levi's publishes a single body measurement per women's top size. We show the side-by-side anyway because it's useful — just read it as two different systems, not one chart.
The short answer
In jeans it's nearly a tie — both size by real waist inches, and Levi's even fits a touch big; in tops, Uniqlo runs smaller
For denim, your waist number is the bridge. Levi's runs true to size on paper — the label is a genuine waist measurement, and men's sizes actually fit about half an inch to an inch above the label — while Uniqlo's bottoms are also sold by waist inches. The real Levi's variable isn't the brand but the fit and fabric: rigid denim has zero give and often needs a size up, Ribcage and Wedgie fits run small, and stretchy washes relax with wear.
Above the waist, the brands diverge. Uniqlo runs small — slim through the chest and shoulders with short sleeves, and most shoppers used to American brands size up one. Levi's women's tops chart sits at or above the top of Uniqlo's ranges at every letter: a Levi's S is a 35" chest, which is already the ceiling of Uniqlo's S bust range. If you wear the same letter in both, the Uniqlo piece will be the snugger one.
Uniqlo vs Levi's at a glance
| Uniqlo | Levi's | |
|---|---|---|
| Sizing system | Alpha sizes for clothing; bottoms by numeric waist in inches | Jeans sold as W×L — waist and inseam in inches |
| Denim honesty | Waist-inch labels; chart adjusted per garment | Label is a real measurement; men's sizes fit 0.5–1" above the number |
| Overall fit | Runs small — slim Japanese fit blocks, short in sleeve and torso | Varies by line — a 511 fits nothing like a 501, Ribcage runs tight |
| Where to size up | Tops coming from US brands; two sizes in slim fit | Rigid denim, women's Ribcage and Wedgie fits, rigid 501s in the hip |
| Consistency | Very consistent — fit blocks barely change between seasons | Consistent within a fit, but each fit has its own personality |
Women's sizes aligned by body waist
Rows are aligned by body waist measurement, not by label — Uniqlo uses alpha sizes while Levi's jeans use numeric sizes. Measurements are from each brand's published chart.
| Body waist | Uniqlo size | Closest Levi's sizes |
|---|---|---|
| 24–25" · 60–65 cm | XS | 24 (waist 25.25" · 64 cm) |
| 26–27" · 65–70 cm | S | 25–26 (waist 26.25" · 66.5 cm to 27.25" · 69 cm) |
| 28–30" · 70–76 cm | M | 27–29 (waist 28.25" · 72 cm to 30.25" · 77 cm) |
| 30–33" · 76–83 cm | L | 29–31 (waist 30.25" · 77 cm to 32.75" · 83 cm) |
| 33–36" · 83–91 cm | XL | 32–33 (waist 34.25" · 87 cm to 35.75" · 91 cm) |
| 36–39" · 91–99 cm | 2XL | 34 (waist 37.75" · 96 cm) |
Men's denim: what a Levi's label actually fits
From Levi's published chart — each labeled W size fits a body waist about half an inch to an inch above the number. Uniqlo men's bottoms are also sold by numeric waist in inches, so carry your waist number across and use this table for the Levi's side.
| Labeled size | Fits body waist |
|---|---|
| W30 | 30.5–31" · 77.5–78.5 cm |
| W32 | 32.5–33" · 82.5–84 cm |
| W34 | 34.5–35" · 87.5–89 cm |
| W36 | 36.5–37.5" · 92.5–95.5 cm |
| W38 | 38.5–39.5" · 98–100.5 cm |
| W40 | 40.5–41.5" · 103–105.5 cm |
Women's tops side by side (not apples-to-apples)
Levi's publishes a single body measurement per size; Uniqlo publishes ranges. Levi's letters sit at or above the top of Uniqlo's ranges — the same letter is the roomier garment at Levi's.
| Size | Uniqlo bust | Levi's chest |
|---|---|---|
| XS | 31–32" · 78–83 cm | 33" · 84 cm |
| S | 33–34" · 83–88 cm | 35" · 89 cm |
| M | 35–37" · 88–94 cm | 37" · 94 cm |
| L | 37–40" · 94–101 cm | 39.5" · 100.5 cm |
| XL | 40–43" · 101–109 cm | 42.5" · 108 cm |
Switching between Uniqlo and Levi's
- In jeans, carry your waist-in-inches number between the brands — then adjust for the Levi's fit: rigid 501s and the women's Ribcage and Wedgie need a size up, stretchy washes don't.
- Switching from Uniqlo women's alpha sizes to Levi's? Convert through your actual waist measurement using the table above, not through the letter.
- In tops, expect the Uniqlo piece to fit slimmer at the same letter — most shoppers used to American brands, Levi's included, go up one at Uniqlo.
- Check lengths both ways: Uniqlo torsos and sleeves run short, while Levi's lets you pick your inseam (L30 suits roughly 5'6"–5'8", L32 suits 5'8"–6'0").
Measurements are based on each brand's published size charts and may vary by garment, fabric, and region. For the full charts and fit notes, see the Uniqlo size guide and the Levi's size guide.
Uniqlo vs Levi's sizing FAQs
Which runs smaller, Uniqlo or Levi's?
In jeans, neither by label — both sell by waist inches, and Levi's men's sizes actually fit half an inch to an inch of body waist above the number. In tops, Uniqlo runs smaller: it cuts slim on Japanese fit blocks, while Levi's women's top sizes sit at or above the top of Uniqlo's ranges at the same letter.
I wear a Uniqlo women's M — what Levi's jeans size is that?
Uniqlo's M covers a 28–30" waist, which spans Levi's 27 through 29 (body waists of 28.25" to 30.25"). Pick by your actual waist measurement, and if you're choosing a rigid fit like the original 501, take the larger of your two candidates — raw denim has no stretch.
Can I just use my Uniqlo waist size when buying Levi's?
As a starting point, yes — both label bottoms in waist inches. But Levi's labeled sizes fit slightly bigger than the number, and fit matters more than brand: the 511 runs tight in the thigh on muscular builds, the Ribcage runs small and doesn't stretch out, and Shrink-to-Fit 501s need 1–2 extra inches in the waist if you'll machine-wash them.
Why isn't the tops comparison straightforward?
Because the systems differ: Uniqlo publishes a body-measurement range per alpha size, while Levi's publishes single values, and Uniqlo's slim Japanese cut means its garments fit closer than the chart numbers suggest. Compare your own chest or bust measurement against each chart rather than matching letters.
Do either brand's jeans shrink?
Most modern Levi's are preshrunk and barely shrink if washed cold and line-dried — the exception is rigid Shrink-to-Fit 501s, which Levi's says need about 1 inch extra in the waist and 3 inches in length if machine-washed and dried. That's a Levi's-specific quirk to factor in; sizing at Uniqlo doesn't carry an equivalent rule.
