Interactive tool · Fit

Leggings size converter between brands

Know your size in one brand? See which size to order in five others. Every result comes from the brands’ own published size charts, matched by hip measurement — the number that decides how leggings fit.

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Same hips, different labels

Each row is one hip measurement. Read across to see the size each brand’s chart assigns to it. A slash means the measurement sits between two sizes.

Hips	Lululemon	Gymshark	Nike	adidas	Under Armour	Sweaty Betty
84 cm · 33″	2	—	XXS / XS	—	—	XXS
88 cm · 34.5″	4	XXS	XS	XS	XS	XXS / XS
92 cm · 36″	6	XXS / XS	S	XS / S	XS / S	XS
96 cm · 38″	6 / 8	XS	S	S	S / M	S
100 cm · 39.5″	8 / 10	S	M	M	M	M
104 cm · 41″	10	M	M / L	M / L	L	M / L
108 cm · 42.5″	12	M / L	L	L	L / XL	L / XL
112 cm · 44″	12 / 14	L / XL	L / XL	L / XL	XL	XL
116 cm · 45.5″	14 / 16	XL	XL	XL	XL / XXL	XXL
120 cm · 47″	16	XXL	XL / XXL	2XL	XXL	XXL
124 cm · 49″	18	—	XXL	2XL	XXL	—
128 cm · 50.5″	18 / 20	—	XXL / 1X	—	—	—
132 cm · 52″	20	—	1X	—	—	—

Brand-to-brand size charts

The most searched comparisons, each with a full size-by-size table in both directions.

Lululemon vs GymsharkRead →Lululemon vs NikeRead →Lululemon vs Sweaty BettyRead →Lululemon vs adidasRead →Gymshark vs NikeRead →Gymshark vs Sweaty BettyRead →Nike vs adidasRead →Nike vs Under ArmourRead →

Brand size charts in cm and inches

Women’s bottoms charts as published, with centimetres and inches side by side. Single values are the brand’s reference measurement for that size; ranges are shown as published.

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	—

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.

Source: the brand’s official women’s size guide, checked 2026-11-13 · Lululemon ↗

Gymshark

Size	Waist (cm)	Hips (cm)	Waist (in)	Hips (in)	Other labels
XXS	61	90	24	35.5	UK 4–6 · US 2–4
XS	66	95	26	37.5	UK 6–8 · US 4–6
S	71	100	28	39.5	UK 8–10 · US 6–8
M	76	105	30	41.5	UK 10–12 · US 8–10
L	81	110	32	43.5	UK 12–14 · US 10–12
XL	86	115	34	45.5	UK 14–16 · US 12–14
XXL	91	120	36	47	UK 16–18 · US 14–16

Gymshark says its leggings are designed to fit true to size, to size up when between sizes, and to go by the hip measurement if your waist is smaller.
Gymshark lists one inseam per length for all sizes: Short 72.5 cm (28.5″), Regular 77.75 cm (30.5″) and Long 82.5 cm (32.5″).

Source: the brand’s official women’s size guide, checked 2026-11-13 · Gymshark ↗

Nike

Size	Waist (cm)	Hips (cm)	Waist (in)	Hips (in)	Other labels
XXS	54–60	77–84	21.25–23.5	30.5–33	US 0
XS	60–66	84–90	23.5–26	33–35.5	US 0–2
S	66–74	90–98	26–29	35.5–38.5	US 4–6
M	74–80	98–104	29–31.5	38.5–41	US 8–10
L	80–88	104–112	31.5–34.5	41–44	US 12–14
XL	88–98	112–119	34.5–38.5	44–47	US 16–18
XXL	98–108	119–127	38.5–42.5	47–50	US 20–22
1X	109–116	130–137	43–45.5	51–54	US 18W–20W
2X	116–124	137–145	45.5–49	54–57	US 22W–24W
3X	124–135	145–155	49–53	57–61	US 26W–28W

Where Nike offers short and tall versions, short is 5 cm (2″) shorter and tall 5 cm (2″) longer in the inseam than regular.

Source: the brand’s official women’s size guide, checked 2026-11-13 · Nike ↗

adidas

Size	Waist (cm)	Hips (cm)	Waist (in)	Hips (in)	Other labels
XS	61–66	86–91	24–26	34–36	US 0–2 · DE 30–32
S	69–71	94–97	27–28	37–38	US 4–6 · DE 34–36
M	74–79	99–104	29–31	39–41	US 8–10 · DE 38–40
L	81–86	107–109	32–34	42–43	US 12–14 · DE 42–44
XL	89–94	112–117	35–37	44–46	US 16–18 · DE 46–48
2XL	97–104	119–124	38–41	47–49	US 20–22 · DE 50–52

Source: the brand’s official women’s size guide, checked 2026-11-13 · adidas ↗

Under Armour

Size	Waist (cm)	Hips (cm)	Waist (in)	Hips (in)	Other labels
XS	65–68	87–91	25.5–27	34.5–36	US 0–2
S	68–74	91–96	27–29	36–38	US 4–6
M	74–79	96–101	29–31	38–40	US 8–10
L	79–86	101–109	31–34	40–43	US 12–14
XL	86–94	109–117	34–37	43–46	US 16
XXL	94–102	117–124	37–40	46–49	US 18

Under Armour describes its chart as “desired standards” and notes that some variability may occur.

Source: the brand’s official women’s size guide, checked 2026-11-13 · Under Armour ↗

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

This chart comes from a stockist and should be confirmed on the brand’s product page before ordering.

Source: an authorised stockist’s chart for this brand (the brand’s own page could not be read), checked 2026-11-13 · Sweaty Betty ↗

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.

Why brands disagree

There is no shared standard for activewear sizes. A Gymshark Small and a Nike Small are built around different hip measurements, so the same label can fit very differently.

Numeric and letter systems do not line up neatly either: Lululemon uses US numbers 0–20, adidas lists German sizes, and UK stockists use UK numbers.

Cut and fabric add their own differences: compression lines are cut smaller, contour styles move room from the waist to the hips, and soft brushed fabrics relax with wear.

Brand size questions

Is a Lululemon 6 a Small?

By hip measurement a Lululemon 6 (36–37″ hips) is a Small at Nike and Under Armour, between XS and S at adidas and Sweaty Betty, and between XXS and XS at Gymshark, whose chart runs larger. Use the converter with your own hips for a precise answer.

Why is my Gymshark size smaller than my Nike size?

Gymshark’s published hip measurements are larger than Nike’s for the same letter, so many people take one size smaller in Gymshark than in Nike.

Should I convert by waist or hips?

By hips for leggings. Hips and seat decide coverage, opacity and whether the waistband rolls; the waist only changes how firm the band feels.

Does this include petite, tall or plus sizes?

It includes every size each brand lists in its main women’s bottoms chart, including Nike’s 1X–3X. Petite and tall versions change the inseam and rise, not the hip size.

How current are these charts?

Each chart shows the date it was checked against its source. Brands occasionally revise charts, so open the source link before an important order.

Related fit tools

Size finder & international converterRead →Leggings Length FinderRead →Should you size down or up?Read →How to measure for leggingsRead →

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.