Interactive tool · Fit
Lululemon vs Sweaty Betty: leggings size conversion
Size-by-size equivalents, matched by hip measurement from each brand’s published women’s bottoms chart. Where a size falls between two sizes of the other brand, both are shown.
Lululemon → Sweaty Betty
| If you wear Lululemon | Lululemon hips | Choose Sweaty Betty |
|---|---|---|
| 0 | 80 cm · 31.5″ | — |
| 2 | 84 cm · 33″ | XXS |
| 4 | 88 cm · 34.5″ | XXS / XS |
| 6 | 93 cm · 36.5″ | XS / S |
| 8 | 98 cm · 38.5″ | S / M |
| 10 | 104 cm · 40.5″ | M / L |
| 12 | 109 cm · 43″ | L / XL |
| 14 | 114 cm · 45″ | XL / XXL |
| 16 | 119 cm · 47″ | XXL |
| 18 | 125 cm · 49″ | — |
| 20 | 130 cm · 51″ | — |
Sweaty Betty → Lululemon
| If you wear Sweaty Betty | Sweaty Betty hips | Choose Lululemon |
|---|---|---|
| XXS | 86 cm · 34″ | 2 / 4 |
| XS | 91 cm · 36″ | 4 / 6 |
| S | 96 cm · 38″ | 6 / 8 |
| M | 101 cm · 40″ | 8 / 10 |
| L | 106 cm · 41.5″ | 10 / 12 |
| XL | 111 cm · 43.5″ | 12 / 14 |
| XXL | 118 cm · 46.5″ | 16 |
Between two sizes? Choose the smaller one for running, gym and compression; choose the larger one for long days, travel or if waistbands tend to dig in.
At a glance
Lululemon
- Size range
- 0–20
- Chart published in
- inches
- Source
- Brand chart ↗
- Lululemon lists separate “contour fit” measurements for some leggings: smaller at the waist and larger at the hip. If you buy a contour style, compare your hips with its own column.
- Lululemon names leggings by inseam in inches (for example 25″ or 28″), so length is chosen separately from size.
Sweaty Betty
- Size range
- XXS–XXL
- Chart published in
- centimetres
- Source
- Stockist chart ↗
- This chart comes from a stockist and should be confirmed on the brand’s product page before ordering.
Brand size charts in cm and inches
Lululemon
| Size | Waist (cm) | Hips (cm) | Waist (in) | Hips (in) | Other labels |
|---|---|---|---|---|---|
| 0 | 55 | 80 | 21.5 | 31.5 | — |
| 2 | 58 | 84 | 23 | 33 | — |
| 4 | 61–64 | 86–89 | 24–25 | 34–35 | — |
| 6 | 66–69 | 91–94 | 26–27 | 36–37 | — |
| 8 | 71–74 | 97–99 | 28–29 | 38–39 | — |
| 10 | 76–80 | 102–105 | 30–31.5 | 40–41.5 | — |
| 12 | 84 | 109 | 33 | 43 | — |
| 14 | 89 | 114 | 35 | 45 | — |
| 16 | 99 | 119 | 39 | 47 | — |
| 18 | 104 | 124 | 41 | 49 | — |
| 20 | 109 | 130 | 43 | 51 | — |
Sweaty Betty
| Size | Waist (cm) | Hips (cm) | Waist (in) | Hips (in) | Other labels |
|---|---|---|---|---|---|
| XXS | 59 | 86 | 23 | 34 | UK 6 |
| XS | 64 | 91 | 25 | 36 | UK 8 |
| S | 69 | 96 | 27 | 38 | UK 10 |
| M | 74 | 101 | 29 | 40 | UK 12 |
| L | 79 | 106 | 31 | 41.5 | UK 14 |
| XL | 84 | 111 | 33 | 43.5 | UK 16–18 |
| XXL | 91 | 118 | 36 | 46.5 | UK 18–20 |
How the converter decides
Each size is reduced to the centre of its published hip range (or the single hip value the brand gives). Your hip measurement — or the hip of the size you already wear — is compared with those centres.
If you are within 30% of the gap to the nearest size, you get that size. In the middle of the gap you see both sizes, because the choice then depends on the fit you want, not on the chart.
Waist is shown as a second opinion. In leggings the hip and seat decide whether the fabric stays opaque and stays up; a waist that points one size smaller usually just means a firmer waistband.
Other brand comparisons
LEGGIC is independent and not affiliated with any brand shown. Brand names are used only to identify their published size charts; trademarks belong to their owners.